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The title molecules, HL1 and HL2, differ in their conformation with the pyridine ring being inclined to the pyrazine ring by 61.34 (6) and 84.33 (12)°, respectively. The crystal packing is also slightly different, with molecules of HL1 linked by pairs of N—H
N hydrogen bonds, forming inversion dimers, while for HL2 molecules are linked by N—HN and C—HN hydrogen bonds, forming chains along [010].
N hydrogen bonds, forming inversion dimers, while for HL2 molecules are linked by N—HN and C—HN hydrogen bonds, forming chains along [010].research communicationsOpen access
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The title compound, a hydrated copper acetate complex of the ligand N-[(pyridin-4-yl)methyl]pyrazine-2-carboxamide, has a metal-organic framework (MOF) structure with a 10 (3) network topology. The water molecules are located in the cavities of the framework and linked to it by O—HO hydrogen bonds.
O hydrogen bonds.metal-organic compoundsOpen access
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In the title salt, [(CH3CH2CH2)2NH2]4[Sn(C2O4)4]·H2O, the SnIV atom of the stannate anion is located on a special position with -42m symmetry. It is eight-coordinated by four chelating oxalate anions. The dipropylammonium cation possesses mirror symmetry while the lattice water molecule is disordered about a position with -42m symmetry and has an occupancy of 0.25. In the crystal, the anions and cations are linked by N—HO hydrogen bonds, forming a three-dimensional network. This network is futher stabilized by weak O—HO hydrogen bonds involving the water molecules and oxalate O atoms. The crystal studied was refined as an inversion twin.
O hydrogen bonds, forming a three-dimensional network. This network is futher stabilized by weak O—HO hydrogen bonds involving the water molecules and oxalate O atoms. The crystal studied was refined as an inversion twin.research communicationsOpen access
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The title molecule crystallizes with two half-molecules in the asymmetric unit, the whole molecules being generated by twofold rotation symmetry. In the crystal, there are two interpenetrating three-dimensional networks involving the individual molecules that are linked by C—HBr and BrBr interactions.
Br and BrBr interactions.research communicationsOpen access
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The title compounds are iron(II) dihalide complexes of the bulky arylimidazole ligand 1-(2,6-diisopropylphenyl)-1H-imidazole. The FeCl2 and FeBr2 complexes are isotypic, while the third compound, also an FeBr2 complex, crystallizes as a diethyl ether disolvate.
metal-organic compoundsOpen access
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The title compound, [Sn(CH3)2Cl2(CH4N2S)2], crystallizes with two half-molecules in the asymmetric unit. Both molecules are completed by inversion symmetry with the two SnIV atoms located on inversion centers. The metal atoms have distorted octahedral coordination environments defined by two Cl atoms, two C atoms of methyl groups and two thiourea S atoms. In the crystal, molecules are linked via N—HCl and N—HS hydrogen bonds, forming a three-dimensional structure.
Cl and N—HS hydrogen bonds, forming a three-dimensional structure.organic compoundsOpen access
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In the asymmetric unit of the title compound, C27H27FN2O·0.25CHCl3, there are two independent molecules (A and B) together with a partially disordered chloroform molecule situated about an inversion center. The conformation of the two molecules is very similar. The bridging piperidine rings each have a chair conformation while the piperidin-2-one rings of the quinoline moiety have screw-boat conformations. The benzene rings of the biphenyl moiety are inclined to one another by 26.37 (4) and 23.75 (15)° in molecules A and B, respectively. The mean plane of the central piperidine ring [r.m.s. deviation = 0.241 (2) Å in both molecules A and B] is inclined to the benzene ring of the quinoline moiety by 80.06 (4) in A and 83.75 (15)° in B, while it is inclined to the adjacent benzene ring of the biphenyl group by 73.623 (15) in A and 75.65 (14)° in B. In the crystal, individual molecules are linked by pairs of N—HO hydrogen bonds, forming A–A and B–B inversion dimers with R22(8) ring motifs. The dimers are stabilized by C—HO hydrogen bonds and linked via C—HF and C—HN hydrogen bonds into a three-dimensional network. Several C—Hπ interactions are also present.
O hydrogen bonds, forming A–A and B–B inversion dimers with R22(8) ring motifs. The dimers are stabilized by C—HO hydrogen bonds and linked via C—HF and C—HN hydrogen bonds into a three-dimensional network. Several C—Hπ interactions are also present.research communicationsOpen access
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In the title molecule, the phenyl rings are inclined to one another by 78.63 (17)°. In the crystal, molecules are linked via N—HCl hydrogen bonds, forming chains along [10-1], which enclose two adjacent 
(6) ring motifs.
Cl hydrogen bonds, forming chains along [10-1], which enclose two adjacent 
(6) ring motifs.data reportsOpen access
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The title compound, C12H20N2S4, synthesized by the reaction of 2,3,5,6-tetrakis(bromomethyl)pyrazine with sodium methanethiolate, crystallizes with a half -molecule in the asymmetric unit. The whole molecule is generated by inversion symmetry; the inversion centre being located in the centre of the pyrazine ring. The molecule has an S-shaped conformation with two (methylsulfanyl)methyl substituent arms directed above the plane of the pyrazine ring and two below. The C(H3)—S—C(H2)—C(aromatic) torsion angles are 70.47 (18) and −67.65 (17)°, respectively. In the crystal, molecules are linked via weak C—HS hydrogen bonds, forming chains along [001] and enclosing R22(12) ring motifs. The chains are linked by further weak C—HS hydrogen bonds, forming sheets lying parallel to (101).
S hydrogen bonds, forming chains along [001] and enclosing R22(12) ring motifs. The chains are linked by further weak C—HS hydrogen bonds, forming sheets lying parallel to (101).data reportsOpen access
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The heterocyclic molecule in the title solvate, C16H14N4·2CHCl3, possesses inversion symmetry, with the inversion centre situated at the centre of the pyrazine ring. The outer pyridine rings are inclined to the central pyrazine ring by 4.89 (9)°. The compound crystallized as a chloroform disolvate with the solvent molecules linked to the title molecule by C—HN hydrogen bonds. In the crystal, molecules are further linked by π–π interactions involving the pyrazine and pyridine rings of neighbouring molecules [inter-centroid distance = 3.5629 (12) Å; symmetry code: x, y + 1, z + 1].
N hydrogen bonds. In the crystal, molecules are further linked by π–π interactions involving the pyrazine and pyridine rings of neighbouring molecules [inter-centroid distance = 3.5629 (12) Å; symmetry code: x, y + 1, z + 1].
