In the title compound, C(5)H(5)ClN(2)·C(7)H(6)O(2), the carboxyl group of the benzoic acid mol-ecule is twisted away from the attached ring by 14.22 (7)°. In the crystal, the 2-amino-5-chloro-pyridine mol-ecules inter-act with the carboxyl groups of benzoic acid mol-ecules through N-H⋯O and O-H⋯N hydrogen bonds, forming cyclic R(2) (2)(8) hydrogen-bonded motifs, and linking the mol-ecules into chains parallel to the [001] direction. Neighbouring 2-amino-5-chloro-pyridine mol-ecules are also centrosymmetrically paired through C-H⋯Cl hydrogen bonds, forming another R(2) (2)(8) motif. The crystal structure is further stabilized by weak C-H⋯O hydrogen bonds.
The title Schiff base compound, C(13)H(11)NO(5)S·3H(2)O, formed from sulfanilic acid and 2,4-dihydroxy-benzaldehyde, crystallized out as a zwitterion with the N atom protonated. The asymmetric unit consists of one 4-[(2,4-dihydroxy-benzyl-idene)ammonio]benzene-sulfonate and three water mol-ecules. The zwitterion exists in an E configuration with respect to the central C=N double bond. The two benzene rings of the mol-ecule are oriented at a dihedral angle of 27.33 (8)°. An intra-molecular N-H⋯O hydrogen bond stabilizes the mol-ecular structure. In the crystal, the zwitterions are linked into chains along [101] by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds. The three water mol-ecules link these chains into a three-dimensional framework by additional inter-molecular O-H⋯O hydrogen bonds. A π⋯π inter-action [3.5485 (9) Å] further stabilizes the crystal structure.
In the title compound, C(6)H(9)N(2) (+)·C(7)H(4)NO(4) (-), the nitro group of the 4-nitro-benzoate anion is twisted by 6.2 (2)° from the attached ring. In the crystal structure, the cations and anions are linked via strong N-H⋯O and weak C-H⋯O hydrogen bonds, forming a three-dimensional network.
In the title compound, C(6)H(9)N(2) (+)·C(7)H(6)NO(2) (-), the H atom of the N-H group and an H atom of the 2-amino group from the cation are involved in inter-molecular N-H⋯O hydrogen bonds with the O atoms of the carboxyl-ate group of the anion, forming an R(2) (2)(8) ring motif. These ring motifs are, in turn, connected by further N-H⋯O hydrogen bonds, forming a two-dimensional network. The crystal structure is further stabilized by π⋯π stacking inter-actions involving the benzene and pyridinium rings with a centroid-centroid distance of 3.7594 (8) Å.
The title compound, C(10)H(11)ClN(2)OS, adopts a cis-trans configuration with respect to the position of the phenyl and 3-chloro-propionyl groups relative to the thiono group across the C-N bonds. The benzene ring is perpendicular to the propionyl thio-urea fragment with a dihedral angle of 82.62 (10)°. An intra-molecular N-H⋯O inter-action occurs. The crystal structure is stabilized by inter-molecular N-H⋯S hydrogen bonds, which link pairs of mol-ecules, building up R(2) (2)(8) ring motifs, and C-H.. π inter-actions.
In the crystal structure of the title compound, C(5)H(9)N(3) (2+)·2NO(3) (-), the cations and anions are connected by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure is further stabilized by π⋯π inter-actions between pyridinium rings [centroid-centroid distance = 3.775 (4) Å].
In the title compound, C(6)H(9)N(2) (+)·C(6)H(4)NO(2) (-), the 2-amino-5-methyl-pyridinium cation is essentially planar, with a maximum deviation of 0.023 (2) Å. In the crystal, the cations and anions are linked via strong N-H⋯O hydrogen bonds, forming a two dimensional network parallel to (100). In addition, π⋯π inter-actions involving the pyridinium and pyridine rings, with centroid-centroid distances of 3.6383 (8) Å, are observed.
In the title adduct, C(5)H(5)BrN(2)·C(7)H(6)O(2), the carboxyl group of the benzoic acid mol-ecule is twisted away from the attached ring by 12.97 (11)°. The 2-amino-5-bromo-pyridine mol-ecules inter-act with the carboxylic group of neighbouring benzoic acid mol-ecules through N-H⋯O and O-H⋯N hydrogen bonds, forming cyclic R(2) (2)(8) hydrogen-bonded motifs and linking the mol-ecules into a two-dimensional network lying parallel to (100). The crystal structure is further stabilized by weak C-H⋯O hydrogen bonds.
In the title salt, C(5)H(6)BrN(2) (+)·C(7)H(6)NO(2) (-), the pyridine N atom of the 2-amino-5-bromo-pyridine mol-ecule is protonated. In the crystal, the protonated N atom and the 2-amino group are hydrogen-bonded to the carboxyl-ate O atoms via a pair of N-H⋯O hydrogen bonds, forming an R(2) (2)(8) ring motif. Two inversion-related 3-amino-benzoate anions are linked through N-H⋯O hydrogen-bonds, forming an R(2) (2)(14) ring motif. The crystal structure is further stabilized by π⋯π inter-actions involving the benzene and pyridinium rings with a centroid-centroid distance of 3.7743 (15) Å.
In the title compound, C(2)H(10)N(2) (2+)·0.5(C(2)O(4))(2-)·NCS(-), the ethyl-enediaminium dication adopts a (+)-synclinal conformation with an N-C-C-N torsion angle of 62.64 (15)°. The oxalate dianion lies across an inversion centre. In the crystal structure, the ions are linked through N-H⋯N, N-H⋯O and C-H⋯S hydrogen bonds, leading to the formation of a three-dimensional network.
In the title compound, C(5)H(6)BrN(2) (+)·C(4)H(5)O(4) (-), the pyridine N atom of the 2-amino-5-bromo-pyridine mol-ecule is protonated. The protonated N atom and the amino group are linked via N-H⋯O hydrogen bonds to the carboxyl-ate O atoms of the singly deprotonated succinate anion. The hydrogen succinate anions are linked via O-H⋯O hydrogen bonds. A weak inter-molecular C-H⋯O hydrogen bond is also observed.
The asymmetric unit of the title compound, C(5)H(7)N(2) (+)·C(2)F(3)O(2) (-), contains four independent 2-amino-pyridinium cations and four independent trifluoro-acetate anions. In the crystal structure, these ions are linked by N-H⋯O hydrogen bonds, forming four cation-anion pairs each containing an R(2) (2)(8) ring motif. The ion pairs are linked into two independent chains along [100] by N-H⋯O hydrogen bonds. In addition, C-H⋯O and C-H⋯F hydrogen bonds and π⋯π inter-actions [centoid-centroid separation = 3.6007 (17) Å] are observed.
In the title mol-ecular salt, [C(6)H(5)(CH(3))(3)N](2)[SnBr(4.75)Cl(1.25)], the Sn(IV) atom (site symmetry ) adopts an octa-hedral coordination geometry. The Br and Cl atoms are disordered over three sites in 0.7415 (13):0.2585 (14), 0.8514 (14):0.1486 (14) and 0.7821 (14):0.2179 (14) ratios.
In the title complex, [Ni(C(20)H(10)Br(2)Cl(2)N(2)O(2))], the Ni(II) ion is coordinated by two phen-oxy O atoms and two imino N atoms of the tetradentate ligand, forming a slightly distorted square-planar environment. The mol-ecule is essentially planar, with an r.m.s. deviation of 0.088 Å for the mean plane defined by all non-H atoms in the mol-ecule.
The V(V) atom in the title compound, [V(C(8)H(9)N(2)O)(C(17)H(14)N(2)O(3))O]·CH(3)OH, is N,O-chelated by the benzoyl-hydrazidate anion and O,N,O'-chelated by the (benzoyl-hydrazono)propionate dianion. The octa-hedral trans-N(2)O(4) coordination geometry is completed by the vanadyl O atom. Two mononuclear complexes and two solvent mol-ecules are linked by O-H⋯O and O-H⋯N hydrogen bonds, generating a centrosymmetric aggregate.
The Schiff base ligand in the title compound, [Sn(C(4)H(9))(2)(C(11)H(12)ClNO(4))], chelates to the Sn atom through the two deprotonated O atoms, as well as through the N atom, to confer an overall cis-C(2)SnNO(2) trigonal-bipyramidal geometry at tin [C-Sn-C = 130.3 (1)°]. The hydr-oxy groups engage in O-H⋯O hydrogen bonding with the O atoms of adjacent mol-ecules, generating a chain running along the c axis.
In the title compound, C(30)H(36)N(2)O(2)S, the dihedral angle between the two aromatic rings of the biphenyl residue is 31.2 (1)°. The two methyl-ene C atoms subtend an angle of 99.9 (1)° at the S atom. In the crystal, mol-ecules form inversion dimers linked by pairs of N-H⋯O hydrogen bonds. The hydroxyl group is shielded by the tert-butyl residues and is therefore not involved in any hydrogen bonding.
In the title Schiff base, C(17)H(14)Cl(4)N(2), the atoms of one of the 2,6-dichloro-benzyl-idene units and the central 1,2-diamino-propane grouping are disordered over two sets of sites in a 0.8838 (12):0.1162 (12) ratio. The dihedral angles between the ordered benzene ring and its disordered counterparts are 57.41 (12) and 54.8 (6)° for the major and minor disorder components, respectively. The crystal studied was a racemic twin, the refined ratio of the twin components being 0.37 (5):0.63 (5).
In the title compound, C(5)H(6)BrN(2) (+)·C(2)F(3)O(2) (-), the F atoms of the anion are disordered over two sets of sites, with occupancies of 0.59 (2):0.41 (2). In the crystal structure, the anions and cations are linked into a two-dimensional network parallel to (100) by N-H⋯O and C-H⋯O hydrogen bonds. Within this network, the N-H⋯O hydrogen bonds generate R(2) (2)(8) ring motifs.
The asymmetric unit of the title compound, C(6)H(9)N(2) (+)·C(2)F(3)O(2) (-), contains two independent 2-amino-4-methyl-pyridinium cations and two independent trifluoro-acetate anions. The F atoms of both anions are disordered over two sets of sites, with site occupancies of 0.50 (3) and 0.50 (3) in one of the anions, and 0.756 (9) and 0.244 (9) in the other. In the crystal, the cations and anions are linked into chains along the b axis by N-H⋯O hydrogen bonds and these chains are cross-linked by C-H⋯O hydrogen bonds, forming a two-dimensional network lying parallel to (101). The crystal structure is further stabilized by π-π inter-actions between the pyridinium rings [centroid-centroid distances = 3.5842 (13) and 3.5665 (16) Å].