The asymmetric unit of the title compound, C8H15N3S, contains two independent mol­ecules. In both mol­ecules, the seven-membered cyclo­heptane ring adopts a chair conformation. An intra­molecular N—H⋯N hydrogen bond is observed in both mol­ecules, forming S(5) graph-set motifs. In the crystal, the two independent mol­ecules are connected through N—H⋯S hydrogen bonds, forming dimers which are in turn further connected by N—H⋯S hydrogen bonds into chains along [010].

In the title sulfanilamide derivative, C15H13NO2S, which shows significant activity against Staphylococcus aureus and Escherichia coli, the dihedral angle between the planes of the aromatic rings is 62.15 (19)° and the four-coordinate S atom adopts an almost ideal tetra­hedral geometry. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.

The title compound, C16H12, crystallizes with four half mol­ecules in the asymmetric unit, each of which is located on a crystallographic centre of inversion. The mol­ecules are essentially planar. The crystal studied was a non-merohedral twin.

Trinuclear copper–pyrazolate entities are present in various Cu-based enzymes and nanojar supra­molecular arrangements. The reaction of copper(II) chloride with pyrazole (pzH) and sodium benzoate (benzNa) assisted by microwave radiation afforded a neutral centrosymmetric hexa­nuclear copper(II) complex, [Cu6(C7H5O2)4(OH)2(C3H3N2)6(C2H5OH)2]·2C2H5OH. Half a mol­ecule is present in the asymmetric unit that comprises a [Cu3(μ3-OH)(pz)3]2+ core with the copper(II) atoms arranged in an irregular triangle. The three copper(II) atoms are bridged by an O atom of the central hydroxyl group and by three bridging pyrazolate ligands on each of the sides. The carboxyl­ate groups show a chelating mode to one and a bridging syn,syn mode to the other two CuII atoms. The coordination environment of one CuII atom is square-planar while it is distorted square-pyramidal for the other two. Two ethanol mol­ecules are present in the asymmetric unit, one binding to one of the CuII atoms, one as a solvent mol­ecule. In the crystal, stabilization arises from inter­molecular O—H⋯O hydrogen-bonding inter­actions.

The title structure, C12H8Cl2O2, is a putative metabolite of 3,5-di­chloro­biphenyl (PCB 14). The dihedral angle between the two benzene rings of the title compounds is 58.86 (4)°. In the crystal, it displays intra- and inter­molecular O—H⋯O hydrogen bonding and inter­molecular O—H⋯Cl hydrogen⋯chlorine inter­actions. The inter­molecular inter­actions form a two-dimensional network parallel to (010).

The synthesis and crystal structure of the title PtII complex, [Pt(C23H16N)Cl(CH3CN)], based on the C,N-chelating 2,4,6-tri­phenyl­pyridine as the primary ligand, is described. The central PtII atom is in a distorted square-planar coordination environment. In the crystal, mol­ecules are arranged via a metallophilic inter­action between platinum atoms with a Pt⋯Pt contact of 7.052 (2) Å. In addition, a π–π inter­action occurs.

Crystallization from a 20-year-old commercial source of 3-ethyl-4-methyl-3-pyrrolin-2-one afforded 1:1 co-crystals of this compound (C7H11NO) with its oxidized derivative, 3-ethyl-4-methyl-3-pyrroline-2,5-dione (C7H9NO2). The compound crystallizes in the space group Poverline{1}, with two mol­ecules of each species in the asymmetric unit. These four mol­ecules form a hydrogen-bonded tetra­mer with a dimer of 3-ethyl-4-methyl-3-pyrrolin-2-one as the core flanked by one mol­ecule of the dione on each side.

In the title compound, C34H35NO4, the dihedral angle between the pyridine ring and attached benzene ring is 79.17 (8)°. The meth­oxy­eth­oxy–eth­oxy side chain is disordered over two orientations in a 0.732 (7):0.268 (7) ratio. In the crystal, very weak C—H⋯N and C—H⋯O inter­actions link the mol­ecules.

In the cation of the title mol­ecular salt, C15H19N2+·PF6−, the dihedral angle between the benzene and pyridine rings is 38.21 (10)°. In the crystal, weak C—H⋯F inter­actions arising from methyl and methyl­ene groups adjacent to the quaternary N atom generate (001) sheets.

The asymmetric unit of the title compound, C17H20O5, contains two independent mol­ecules, A and B, with similar geometries [dihedral angles between the phenyl rings = 56.19 (8) and 54.98 (7)°, respectively]. Intra­molecular O—H⋯O hydrogen bonds occur in both mol­ecules. In the crystal, the A mol­ecules form [1overline{1}0] chains linked by O—H⋯O hydrogen bonds from the hydroxyl group to one of the meth­oxy O atoms. The B mol­ecules form O—H⋯O hydrogen bonds to the hydroxyl O atoms of the A mol­ecules and thus act as fixed spacers between the chains of mol­ecule A. Some weak C—H⋯O contacts are also present.

The title two-dimensional coordination polymer, [Zn(C6H5PO3)]n, was synthesized serendipitously by reacting a tetra­phospho­nate cavitand Tiiii[C3H7, CH3, C6H5] and Zn(CH3COO)2·2H2O in a DMF/H2O mixture. The basic conditions of the reaction cleaved the phospho­nate bridges at the upper rim of the cavitand, making them available for reaction with the zinc ions. The coordination polymer can be described as an inorganic layer in which zinc coordinates the oxygen atoms of the phospho­nate groups in a distorted tetra­hedral environment, while the phenyl groups, which are statistically disordered over two orientations, point up and down with respect to the layer. The layers inter­act through van der Waals inter­actions. The crystal studied was refined as a two-component twin.

The title compound, (C9H8N)2[MnBr4], consists of two quinolinium cations and a [MnBr4]2− anion. The manganese(II) atom, which lies on a twofold rotation axis, is coordinated by four bromide ligands and exhibits a tetra­hedral coordination geometry. The [MnBr4]2− anion and the quinolinium cations are linked by N—H⋯Br hydrogen bonds. π–π stacking inter­actions are observed between the quinolinium cations.

Reduction of the heteroleptic metal carbonyl complex Mo(CO)3(η5-Cp)H with the metallic salt Cs5Bi4 in the presence of [2.2.2]crypt (= 4,7,13,16,21,24-hexa­oxa-1,10-di­aza­bicyclo­[8.8.8]hexa­cosa­ne) in liquid ammonia led to single crystals of bis­[(4,7,13,16,21,24-hexa­oxa-1,10-di­aza­bicyclo­[8.8.8]hexa­cosa­ne)caesium] penta­carbonyl­molybdate, [Cs(C18H36N2O6)]2[Mo(CO)5] or [Cs([2.2.2]crypt)]2[Mo(CO)5]. The twofold negatively charged anionic complex corresponds to the 18 valence electron rule. It consists of an Mo atom coordinated by five carbonyl ligands in a shape inter­mediate between trigonal–bipyramidal and square-pyramidal. The Mo—C distances range from 1.961 (3) to 2.017 (3) Å, and the C≡O distances from 1.164 (3) to 1.180 (4) Å.

The asymmetric unit of the title inorganic–organic salt, poly[di(μ2-2-hy­droxy­propano­ato)cadmium], [Cd(C3H5O3)2]n or [Cd(Hlac)2]n (H2lac = 2-hy­droxy­propanoic acid), comprises of a cadmium cation and two 2-hy­droxy­propano­ate anions. The cadmium cation exhibits a distorted penta­gonal–bipyramidal coordination environment defined by the hy­droxy and carbonyl O atoms of the 2-hy­droxy­propano­ate anions. The coordination mode leads to the formation of layers extending parallel to (010). O—H⋯O hydrogen bonding between the hy­droxy and carbonyl groups stabilizes the structure packing.

The solid-state structural analysis of the title compound [systematic name: 5,11-disulfanylidene-4,6,10,12-tetrakis(2,4,6-trimethylphenyl)-4,6,10,12-tetraazatricyclo[7.3.0.03,7]dodeca-1(9),3(7)-diene-2,8-dione], C44H44N4O2S2 [+solvent], reveals that the mol­ecule crystallizes in a highly symmetric cubic space group so that one quarter of the mol­ecule is crystallographically unique, the mol­ecule lying on special positions (two mirror planes, two twofold axes and a center of inversion). The crystal structure exhibits large cavities of 193 Å3 accounting for 7.3% of the total unit-cell volume. These cavities contain residual density peaks but it was not possible to unambiguously identify the solvent therein. The contribution of the disordered solvent mol­ecules to the scattering was removed using a solvent mask and is not included in the reported mol­ecular weight. No classical hydrogen bonds are observed between the main mol­ecules.

In the title compound, C21H18O4, the dihedral angle between the naphthelene ring system (r.m.s. deviation = 0.014 Å) and the benzene ring is 9.68 (1)°. The C atom of the meth­oxy group of the naphthalene ring system is almost coplanar with the ring [C—O—C—C = −2.0 (3)°], whereas the C atom of the meth­oxy group of the phenol ring is slightly twisted [C—O—C—C = 6.2 (3)°]. An intra­molecular O—H⋯O hydrogen bond generates an S(6) ring motif.

The title compound, C6H3BrN2, also known as 3-bromo­picolino­nitrile, was synthesized by cyanation of 2,3-di­bromo­pyridine. In the solid state, short inter­molecular Br⋯N contacts are observed. Additionally, the crystal packing is consolidated by π–π stacking inter­actions with centroid–centroid distances of 3.7893 (9) Å.

The title compound, C16H16N2O6, lies about an inversion centre at the mid-point of the N—N bond. The mol­ecule features two intra­molecular O—H⋯N and two C—H⋯O hydrogen bonds, each of which forms an S(6) ring motif. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into infinite zigzag chains propagating along the c-axis direction. π–π stacking inter­actions between the pyrone rings [centroid–centroid distances = 3.975 (2) Å] stack the mol­ecules along b.

The title compound, C16H20N4, was synthesized by cyanation of brom­hexine. The compound crystallizes with two unique mol­ecules in the asymmetric unit. The substituted aniline and cyclo­hexane rings are inclined to one another by 37.26 (6)° in one mol­ecule and by 22.84 (7)° in the other. In the crystal packing, intra- and inter­molecular N—H⋯N hydrogen bonds and an inter­molecular C—H⋯N contact were observed.

The title complex, [Os3(C2H4N)H(CO)10] or [Os3(CO)10(μ-H)(μ-HN=C—CH3-1κN:2κC)], was synthesized in 41.6% yield by reactions between Os3(CO)11(CH3CN) and 2,4,6-tri­methyl­hexa­hydro-1,3,5-triazine. The central osmium triangle has two OsI atoms bridged by a hydride ligand and a μ-HN= C—CH3-1κN:2κC triazine fragment. Three CO ligands complete the coordination sphere around each OsI atom, while the remaining Os0 atom has four CO ligands. Each Os atom exhibits a pseudo-octa­hedral coordination environment, discounting the bridging Os—Os bond.

The title com­pound, C34H24O4S·0.5CH2Cl2, crystallizes with two independent mol­ecules and one di­chloro­methane solvent mol­ecule in the asymmetric unit. The crystal packing is consolidated by C—H⋯O hydrogen bonds.

The molecular salt, C23H26N2O2+·Cl−, was obtained from 1-isobutyl-8,9-dimeth­oxy-3-phenyl-5,6-di­hydro­imidazo[5,1-a]iso­quinoline, which was synthesized by cyclo­condensation of α-benzoyl­amino-γ-methyl-N-[2-(3,4-di­meth­oxy­phen­yl)eth­yl]valeramide in the presence of phosphoryl chloride. The tetra­hydro­pyridine ring adopts a twist–boat conformation. In the crystal structure, centrosymmetric dimers are formed by N—H⋯Cl and C—H⋯Cl hydrogen bonds.

The title compound, C14H11Cl2NO2, has been prepared by the condensation of 3,5-di­chloro­salicyl­aldehyde and 2-amino-4-methyl­phenol. The asymmetric unit consists of two independent mol­ecules, both of which are almost planar; the dihedral angle between the two benzene rings is 10.61 (8)° for one mol­ecule and 2.46 (8)° for the other. There is an intra­molecular N—H⋯O hydrogen bond that generates S(6) ring motifs in each mol­ecule. In the crystal, the two independent mol­ecules are linked by O—H⋯O and C—H⋯Cl hydrogen bonds, forming a pseudo-inversion dimer. A π–π inter­action, with a centroid–centroid distance of 3.6065 (12) Å, is also observed.

In the title compound, C22H25NO5·H2O, the ten-membered ring displays an approximate chair–chair conformation, whereas the five-membered furan ring has an envelope conformation, with the C atom of the methine group adjacent to the spiro C atom as the flap. The isoxazole ring is almost planar and its plane is slightly inclined to the plane of the attached phenyl ring. The mean plane of the furan ring is nearly perpendicular to that of the isoxazole ring, as indicated by the dihedral angle between them of 89.39 (12)°. In the crystal, the organic mol­ecules are linked into [010] chains by O—H⋯O hydrogen bonds. The water mol­ecule forms O—H⋯O and O—H⋯N hydrogen bonds and a weak C—H⋯O inter­action is also observed. Together, these lead to a three-dimensional network.

The title magnesium complex, [Mg(C21H20NO2)2(C4H8O)]n, exhibits two N,O-bidentate 2-(di­methyl­amino)-α,α-di­phenyl­benzene­methano­late ligands, form­ing two six-membered chelate rings. The distorted square-pyramidal coordination sphere of the MgII atom is completed by the O atom of a tetra­hydro­furan ligand, with its O atom in the apical position. The O and N atoms are in a mutual trans arrangement. Except for two C—H⋯π inter­actions, no significant inter­molecular inter­actions are observed in the crystal.

The title compound, C18H20N4O4, was synthesized via the base-assisted reaction of piperazine and 2-nitro­benyl bromide in toluene: the complete mol­ecule is generated by a crystallographic inversion centre in the solid state.

The title compound (systematic name: bis­{[2-(4-hy­droxy-1H-indol-3-yl)eth­yl]bis­(propan-2-yl)aza­nium} but-2-enedioate tetra­hydrate), 2C16H25N2O+·C4H2O42−·4H2O, has a singly protonated DPT cation, one half of a fumarate dianion (completed by a crystallographic centre of symmetry) and two water mol­ecules of crystallization in the asymmetric unit. A series of N—H⋯O and O—H⋯O hydrogen bonds form a three-dimensional network in the solid state.

In the title compound, C17H18N4O2, the dihedral angle between the pyridine and benzene rings is 55.68 (11)°. In the crystal, N—H⋯N hydrogen bonds link the mol­ecules into [010] chains.

The title compound, C26H22O2P+·PF6−·C4H7O, crystallizes as a cation-anion pair with a single solvent mol­ecule in the asymmetric unit. Hydrogen bonding occurs between the carb­oxy­lic acid group on the cation and the oxygen atom of the solvent mol­ecule. Longer hydrogen-bonding inter­actions are observed between fluorine atoms of the anion and H atoms on the phenyl rings of the cation.

The title compound, C12H11N3O2S, was synthesized by a condensation reaction of 2-acetyl­indan-1,3-dione and thio­semicarbazide in ethanol in the presence of glacial acetic acid. The mol­ecule adopts a thio­ketone form. The dihedral angle between the mean planes of 1H-inden-1,3(2H)-dione and hydrazinecarbo­thio­amide units is 86.32 (7)°. Weak intra­molecular N—H⋯O and C—H⋯O hydrogen bonds are observed. In the crystal, mol­ecules are linked via pairs of weak inter­molecular N—H⋯O hydrogen bonds, forming inversion dimers. The dimers are further linked into a three-dimensional network through N—H⋯S and N—H⋯O hydrogen bonds, and π–π inter­actions [centroid–centroid distances = 3.5619 (10)–3.9712 (9) Å].

In the title compound, C21H17N3O2, the triazole ring system is inclined at dihedral angles of 4.14 (18) and 69.24 (11)° with the naphthalene ring system and phenyl ring, respectively. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into double columns propagating along the b-axis direction.

The title compound, C22H22O5, crystallizes with two mol­ecules in the asymmetric unit, one of which shows disorder of its ethyl acetate group over two sets of sites in a 0.880 (2):0.120 (2) ratio. The C≡C distances in the two mol­ecules are almost the same [1.1939 (16) and 1.199 (2) Å], but the Csp3—C≡C angles differ somewhat [175.92 (12) and 172.53 (16)°]. In the crystal, several weak C—H⋯O inter­actions are seen.

The title 1,3,4-oxa­diazole derivative crystallizes as a hemihydrate, C8H6N2O2S·0.5H2O, with the water mol­ecule located on a twofold rotation axis. The 1,3,4-oxa­diazole mol­ecule is essentially planar, the r.m.s. deviation of the non-H atoms being 0.0443 Å. The dihedral angle between the mean planes of the phenyl and oxa­diazole rings is 6.101 (17)°. In the crystal, mol­ecules are linked via O—H⋯S and N—H⋯O hydrogen bonds involving the water mol­ecule, the N—H group and the thione S atom into undulating ribbons. Additional π–π inter­actions generate a two-dimensional supra­molecular framework extending parallel to (001).

The asymmetric unit of the title compound {systematic name: sodium [2-({2-[(1-carboxyl­ato-2-methyl-2-sulfanidylprop­yl)amino]­eth­yl}amino)-3-methyl-3-sulf­an­idyl­butano­ato-κ4S,N,N',S']indate(III) tetra­hydrate}, Na[In(C12H20N2O4S2)]·4H2O, contains four indate(III) complex anions {[In(d-ebp)]−; d-H4ebp = N,N'-ethyelenebis(d-penicillamine)], four sodium(I) cations and sixteen water mol­ecules. The indate(III) anions and sodium cations are alternately connected through coordination bonds between Na+ ions and the carboxyl­ate groups of the complex anions, forming an infinite sixfold right-handed helix along the c-axis direction. In the crystal, the helices are linked by O—H⋯O hydrogen bonds between water mol­ecules bound to Na+ ions and carboxyl­ate groups. The crystal studied was twinned via a twofold axis about [001].

The title compound, (C8H22N2O)2[Mo8O26]·H2O, (cis-H2L)2[β-Mo8O26]·H2O, where L = (bis­[2-N,N-di­methyl­amino)­eth­yl] ether), was synthesized from bis­[2-(di­methyl­amino)­eth­yl] ether and MoO3 under solvothermal conditions and characterized by multinuclear NMR and single-crystal X-ray diffraction techniques. The structure displays two [oxybis(ethane-1,2-di­yl)]bis­(di­methyl­ammonium), or [cis-H2L]2+, cations, a central [β-Mo8O26]4− anionic cluster consisting of eight distorted MoO6 octa­hedra, and two water mol­ecules in their deuterated form. The central anion lies across an inversion center. The [cis-H2L]2+ cations are hydrogen bonded to the central [β-Mo8O26]4− cluster via bridging water mol­ecules. In the crystal, O—H⋯O hydrogen bonds link the components into chains along [010]. Weak C—H⋯O hydrogen bonds link these chains into a three-dimensional network.

The title compound, C9H7NO2, was prepared by alkynylation of 4-iodo­nitro­benzene with 1,3-dili­thio­propyne in the presence of 1 equivalent of CuI and catalytic amounts of Pd(PPh3)2Cl2. The complete mol­ecule is generated by crystallographic twofold symmetry with the C—N and C—C≡C—C units lying on the rotation axis. No directional inter­actions beyond normal van der Waals contacts could be identified in the packing.

In the title compound, [Cu2(C7HF4O2)4(C12H8N2)2(CH3OH)], the mol­ecule lies on a twofold rotation axis in space group C2/c. The Cu2+ ion exhibits a distorted octa­hedral sphere with two N atoms from the phenanthroline ligand, three O atoms from the 2,3,4,5-tetra­fluoro­benzoate ligands and one O atom from a methanol mol­ecule. The distortion from an octa­hedral shape is a consequence of the Jahn–Teller effect of CuII and the small bite angle for the bidentate fluoro­benzoate ligand [54.50 (11)°]. The methanol mol­ecule bridges two symmetry-related CuII atoms to form the complete mol­ecule. In the bidentate fluoro­benzoate ligand, one F atom is disordered over two positions of equal occupancy. In the crystal structure, only weak inter­molecular inter­actions are observed.

Single crystals of rubidium tetra­fluorido­bromate(III), RbBrF4, were grown by melting and recrystallizing RbBrF4 from its melt. This is the first determination of the crystal structure of RbBrF4 using single-crystal X-ray diffraction data. We confirmed that the structure contains square-planar [BrF4]− anions and rubidium cations that are coordinated by F atoms in a square-anti­prismatic manner. The compound crystallizes in the KBrF4 structure type. Atomic coordinates and bond lengths and angles were determined with higher precision than in a previous report based on powder X-ray diffraction data [Ivlev et al. (2015). Z. Anorg. Allg. Chem. 641, 2593–2598].

The title compound, C12H10N2O2S, was synthesized via the acid-catalyzed condensation of 4-nitro­aniline and 5-methyl-2-thio­phene­carboxaldehyde in a methanol–water solution. The dihedral angle between the benzene and thio­phene rings is 54.62 (3)°. No directional inter­actions could be identified in the extended structure.

The structure of the title compound, [Os(C6HF4S)4{P(C6H5)3}], has been previously reported [Arroyo et al. (1994). J. Chem. Soc. Dalton Trans. pp. 1819–1824], in the space group Poverline{1}. We have now obtained a monoclinic polymorph for this compound, crystallized from ethanol, while the previous form was obtained from a hexa­ne/chloro­form mixture. The mol­ecular structure is based on a trigonal–bipyramidal OsIV coordination geometry, close to that observed previously in the triclinic form.

In the title compound, [Cd4Cl8(C6H16N2)4], the Cd2+ cations and Cl− anions form M4Cl8 clusters with six of the Cl− ions bridging Cd2+ cations and two being pendant. Each Cd2+ cation has distorted octa­hedral coordination completed by four Cl− ions and two N atoms of the asymmetrical bidentate amino ligand. The cluster consists of pairs of face-sharing hexa­hedra linked by a shared edge.

In the title compound, [Pd(C7H3NO4)(C10H8N2)]·H2O, the PdII cation is four-coordinated in a distorted square-planar coordination geometry defined by the two N atoms of the 2,2'-bi­pyridine ligand, one O atom and one N atom from the pyridine-2,6-di­carboxyl­ate anion. The complex and solvent water mol­ecule are linked by inter­molecular hydrogen bonds. In the crystal, the complex mol­ecules are stacked in columns along the a axis.

The title compound, C16H24N2O2, previously obtained as a yellow oil, exhibits a rather low melting point close to room temperature 297–298 K). In the mol­ecule, the isoindoline ring system is approximately planar and coplanar to the nitro group, forming a dihedral angle of 5.63 (15)°. In the crystal, only weak N—H⋯O and C—H⋯π inter­actions are observed, linking mol­ecules into chains parallel to the [101] direction.

The crystal structure of the benzene monosolvate of the well known organic diphosphite ligand BIPHEPHOS, C46H44O8P2·C6H6, is reported for the first time. Single crystals of BIPHEPHOS were obtained from a benzene solution after layering with n-heptane at room temperature. One specific property of this type of diphosphite structure is the twisting of the biphenyl units. In the crystal, C—H⋯π contacts and π–π stacking inter­actions [centroid-to-centroid distance = 3.8941 (15) Å] are observed.

In the title compound, C29H26ClNO4, the di­hydro­pyridine ring adopts a shallow boat conformation. The mean plane of the di­hydro­pyridine ring (all atoms) subtends dihedral angles of 66.54 (1), 73.71 (1) and 79.47 (1)° with the two phenyl rings and the chloro­phenyl ring, respectively. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into [001] chains.

The title compound, {(C9H11N2)[Mn(NCS)3]}n, has been obtained as a side product of the salt metathesis reaction of 1-ethyl-3-methyl­imidazolium bromide, (EMIm)Br, and K2[Mn(NCS)4]. The structure consists of discrete 1-ethyl-3-methyl­imidazolium cations and an anionic two-dimensional network of manganese(II)-based complex anions, inter­connected by thio­cyanate ions. Every Mn2+ ion is coordinated by three S atoms of three NCS− ions and three N atoms of further three NCS− ions in a meridional octa­hedral fashion.

In the title compound, C18H16N2O2, the dihedral angle between the pyrrole rings is 79.47 (9)°, with the N—H groups approximately orthogonal (H—N⋯N—H pseudo torsion angle = −106°). In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into [11overline{1}] chains. A C—H⋯O inter­action is also observed.

In the title compound, C31H24Br2Cl2N2O, the dihedral angles subtended by the tert-butyl-phenyl, 4,6-di­chloro­phenol and 4-bromo­phenyl (×2) rings are 70.7 (3), 8.1 (3), 28.1 (3) and 84.2 (3)°, respectively. The orientations of the pendant rings may be related to intra­molecular O—H⋯N and C—H⋯π inter­actions. One of the tert-butyl methyl groups is disordered over two sets of sites in a 0.54 (3):0.46 (3) ratio. In the crystal, a weak C—H⋯π inter­action generates inversion dimers.

In the title hydrated salt, [Ni(C21H17F2N3)2](NO3)2·2H2O, the central NiII ion is coordinated by six N atoms from two tridentate chelating 2,6-bis­[(E)-(4-fluoro­benzyl­imino)­meth­yl]pyridine ligands. While the central NiII ion is six-coordinate, its environment is distorted from an octa­hedral structure because of the unequal Ni—N distances. The Ni—N bond lengths vary from 1.8642 (14) to 2.2131 (15) Å, while the N—Ni—N angles range from 79.98 (6) to 104.44 (6)°. Three coordinating sites of each chelating agent are almost coplanar with respect to the pyridine ring, and two pyridine moieties are perpendicular to each other. Two non-coordinating nitrate anions within the asymmetric unit balance the charges of the central metal ion, and are linked with two crystal water mol­ecules, forming a water–nitrate cyclic tetra­meric unit [O⋯O = 2.813 (2) to 3.062 (2) Å]. In an isolated mol­ecule, the fluoro­phenyl rings of one ligand are stacked with the central ring of the other ligand via π–π inter­actions, with the closest centroid-to-plane distances being 3.359 (6), 3.408 (5), 3.757 (6) and 3.659 (5) Å.

In the title compound, C29H23ClN2O, the 5-chloro­phenol ring and the imidazole ring are nearly coplanar, with a dihedral angle of 15.76 (9)° between them. The ethyl­phenyl ring and the two phenyl rings subtend angles of 71.09 (7), 43.95 (5) and 36.53 (9)°, respectively, with the imidazole plane. An intra­molecular O—H⋯N hydrogen bond supports the mol­ecular conformation, and an inter­molecular C—H⋯O inter­action, originating from an ortho-phenyl H atom, stabilizes the packing arrangement. In addition, a weak C—H⋯π inter­action, also involving an ortho-phenyl H atom, is observed.