Bis(2,3-diamino-pyridinium) phthalate dihydrate.

The complete anion of the title hydrated mol-ecular salt, 2C(5)H(8)N(3) (+)·C(8)H(4)O(4) (-)·2H(2)O, is generated by a crystallographic twofold axis. In the crystal, the cations, anions and water mol-ecules are connected by N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure also features C-H⋯π inter-actions.

2,3-Diamino-pyridinium sorbate-sorbic acid (1/1).

In the title mol-ecular salt-adduct, C(5)H(8)N(3) (+)·C(6)H(7)O(2) (-)·C(6)H(8)O(2), the 2,3-diamino-pyridinium cation is essentially planar, with a maximum deviation of 0.013 (2) Å, and is protanated at its pyridine N atom. The sorbate anion and sorbic acid mol-ecules exist in extended conformations. In the crystal, the protonated N atom and one of the two amino-group H atoms are hydrogen bonded to the sorbate anion through a pair of N-H⋯O hydrogen bonds, forming an R(1) (2)(6) ring motif. The carboxyl groups of the sorbic acid mol-ecules and the carboxyl-ate groups of the sorbate anions are connected via O-H⋯O hydrogen bonds. Furthermore, the ion pairs and neutral mol-ecules are connected via inter-molecular N-H⋯O hydrogen bonds, forming sheets lying parallel to (100).

2,3-Diamino-pyridinium 3-chloro-benzo-ate-3-chloro-benzoic acid (1/1).

The asymmetric unit of the title compound, C(5)H(8)N(3) (+)·C(7)H(4)ClO(2) (-)·C(7)H(5)ClO(2), contains an ion pair and a 3-chloro-benzoic acid mol-ecule. In the cation, the pyridine N atom is protonated. In the crystal, the components are connected via N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, thereby forming sheets lying parallel to (100).

Bis(2,1,3-benzoselenadiazole-κN)dibromidocopper(II).

In the title complex, [CuBr(2)(C(6)H(4)N(2)Se)(2)], the Cu(II) ion is tetra-coordinated by two bromide anions and two N atoms in a distorted square-planar geometry. The two essentially planar 2,1,3-benzoselenadiazole ligands [maximum deviations = 0.012 (2) and 0.030 (2) Å] are approximately coplanar [dihedral angle = 6.14 (6)°]. In the crystal, short inter-molecular Se⋯Br, Se⋯N and N⋯N inter-actions are observed. These short inter-actions and inter-molecular C-H⋯Br hydrogen bonds link the complex mol-ecules into two-dimensional arrays parallel to the ac plane.

(Z)-1,2-Dichloro-1,2-bis-(3-chloro-quinoxalin-2-yl)ethene.

The title compound, C(18)H(8)Cl(4)N(4), exists in a cis configuration with respect to the bridging C=C bond. The two essentially planar quinoxaline ring systems [maximum deviations = 0.012 (1) and 0.022 (1) Å] are inclined at an angle of 59.84 (3). In the crystal, adjacent mol-ecules are linked into chains propagating along [001] via inter-molecular C-H⋯N hydrogen bonds. Weak inter-molecular π-π [centroid-centroid distance = 3.6029 (7)°] and C-H⋯π inter-actions are also observed.

Adeninium perchlorate.

IN THE TITLE SALT (SYSTEMATIC NAME: 6-amino-9H-purin-1-ium perchlorate), C(5)H(6)N(5) (+)·ClO(4) (-), the adeninium cation is essentially planar, with a maximum deviation of 0.038 (1) Å. The whole of the perchlorate anion is disordered over two sets of sites with an occupancy ratio of 0.589 (13):0.411 (13). In the crystal, the adeninium cations are linked by pairs of N-H⋯N hydrogen bond into inversion dimers. The dimers and the anions are further inter-connected into a three-dimensional supra-molecular structure via inter-molecular N-H⋯O, C-H⋯O and C-H⋯N hydrogen bonds.

2,3-Diamino-pyridinium 2-hy-droxy-benzoate.

In the title mol-ecular salt, C(5)H(8)N(3) (+)·C(7)H(5)O(3) (-), the 2,3-diamino-pyridinium cation is essentially planar, with a maximum deviation of 0.006 (2) Å. In the crystal, adjacent cations and anions are linked by pairs of N-H⋯O hydrogen bonds, generating R(2) (2)(8) loops. These dimers are linked by further N-H⋯O hydrogen bonds and C-H⋯O inter-actions to form sheets lying parallel to (001). A typical intra-molecular O-H⋯O hydrogen bond is also observed in the salicylate (2-hy-droxy-benzoate) anion, which generates an S(6) ring. The crystal structure also features π-π stacking inter-actions between the pyridinium rings of the cations, with a centroid-centroid distance of 3.5896 (15) Å.

2,3-Diamino-pyridinium 3-carb-oxy-4-hy-droxy-benzene-sulfonate monohydrate.

In the title hydrated mol-ecular salt, C(5)H(8)N(3) (+)·C(7)H(5)O(6)S(-)·H(2)O, the ion pairs and water mol-ecules are connected by N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, thereby forming a three-dimensional network. There is an intra-molecular O-H⋯O hydrogen bond in the 3-carb-oxy-4-hy-droxy-benzene-sulfonate anion, which generates an S(6) ring motif.

2,3-Diamino-pyridinium 4-carb-oxy-butano-ate.

In the title mol-ecular salt, C(5)H(8)N(3) (+)·C(5)H(7)O(4) (-), the 2,3-diamino-pyridine mol-ecule is protonated at the pyridine N atom. The cation is essentially planar, with a maximum deviation of 0.015 (2) Å, and the anion adopts an extended conformation. In the crystal, the hydrogen glutarate (4-carb-oxy-butano-ate) anions are self-assembled through O-H⋯O hydrogen bonds, forming chains. The cations are connected to the anion chains via N-H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure also features aromatic π-π inter-actions between the pyridinium cations, with a centroid-centroid distance of 3.4464 (10) Å.

(4-Chloro-phen-yl)[1-(4-methoxy-phen-yl)-3-(5-nitro-2-fur-yl)-1H-pyrazol-4-yl]methanone.

In the title compound, C(21)H(14)ClN(3)O(5), an intra-molecular C-H⋯O hydrogen bond generates an S(7) ring motif and the furan and pyrazole rings are almost coplanar, making a dihedral angle of 1.98 (5)°. The pyrazole ring is inclined at dihedral angles of 47.59 (4) and 7.27 (4)° to the chloro-phenyl and methoxy-phenyl groups, respectively. The nitro group is almost coplanar to its attached furan ring [dihedral angle = 2.03 (12)°]. In the crystal, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network. The crystal structure also features short inter-molecular O⋯N [2.8546 (12) Å] and Cl⋯O [3.0844 (9) Å] contacts as well as aromatic π-π stacking inter-actions [centroid-centroid distance = 3.4367 (6) Å].

2-(tert-Butoxy-carbonyl-amino)-6-(1,3-dioxo-1H-2,3-dihydro-benzo[de]isoquinolin-2-yl)hexa-noic acid.

In the title naphthalimide derivative, C(23)H(26)N(2)O(6), the 1,8-naphthalimide system is essentially planar [maximum deviation = 0.0456 (16) Å]. A characteristic pattern of alternating long and short C-C bond lengths is observed in the 1,8-naphthalimide unit. The mean planes through the methyl carbamate and acetic acid groups form dihedral angles of 42.30 (9) and 61.59 (9)°, respectively, with the 1,8-naphthalimide plane. In the crystal structure, inter-molecular O-H⋯O and C-H⋯O hydrogen bonds link neighbouring mol-ecules, forming R(2) (2)(9) hydrogen-bond ring motifs. These rings are further inter-connected by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds into a three-dimensional supra-molecular network.

2-[(1Z)-(9-Ethyl-9H-carbazol-3-yl)methyl-eneamino]-4,5,6,7-tetra-hydro-1-benzothio-phene-3-carbonitrile-benzene (2/1).

In the title compound, 2C(24)H(21)N(3)S·C(6)H(6), the two independent Schiff base mol-ecules (A and B) in the asymmetric unit differ in the orientation of the tetra-hydro-benzothio-phene ring system with respect to the carbazole ring system by 180° rotation about the C-C bond in the C-C=N-C linkage. The two mol-ecules also differ in the orientation of the ethyl groups [C-N-C-C torsion angle of 90.7 (3)° in mol-ecule A, and -79.4 (3)° in mol-ecule B]. In mol-ecule B, two methyl-ene C atoms of the cyclo-hexene ring are disordered over two sites with occupancies of 0.58 (1) and 0.42 (1). The cyclo-hexene rings in both mol-ecules adopt half-chair conformations. The dihedral angle between the thio-phene ring and the carbazole ring system is 8.07 (9)° in mol-ecule A [3.10 (9)° in mol-ecule B]. In the crystal structure, the independent mol-ecules are linked into dimers by inter-molecular C-H⋯N hydrogen bonds. In addition, C-H⋯π inter-actions are observed.

2-Bromo-3-phenyl-1-(3-phenyl-sydnon-4-yl)prop-2-en-1-one.

THE TITLE SYDNONE DERIVATIVE [SYSTEMATIC NAME: 2-bromo-1-(5-oxido-3-phenyl-1,2,3-oxadiazo-lium-4-yl)-3-phenyl-prop-2-en-1-one], C(17)H(11)BrN(2)O(3), exists in a Z configuration with respect to the acyclic C=C bond. An intra-molecular C-H⋯Br hydrogen bond generates a six-membered ring, producing an S(6) ring motif. The 1,2,3-oxadiazole ring in the sydnone unit is essentially planar [maximum deviation = 0.011 (2) Å] and forms dihedral angles of 55.39 (13) and 57.12 (12)° with the two benzene rings. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link mol-ecules into two-mol-ecule-thick arrays parallel to the bc plane. The crystal structure also features a short inter-molecular N⋯C contacts [3.030 (3) Å] as well as C-H⋯π and π-π inter-actions [centroid-centroid distances = 3.3798 (11) and 3.2403 (12) Å].

[3-(5-Nitro-2-fur-yl)-1-phenyl-1H-pyrazol-4-yl](phen-yl)methanone.

In the title pyrazole compound, C(20)H(13)N(3)O(4), an intra-molecular C-H⋯O hydrogen bond generates a seven-membered ring, producing an S(7) ring motif. The essentially planar furan and pyrazole rings [maximum deviations of 0.002 (1) and 0.007 (1) Å, respectively] are coplanar with each other, forming a dihedral angle of 3.06 (10)°. The pyrazole ring forms dihedral angles of 8.51 (9) and 56.81 (9)° with the two benzene rings. The nitro group is coplanar with the attached furan ring, as indicated by the dihedral angle of 2.5 (3)°. In the crystal packing, inter-molecular C-H⋯O hydrogen bonds link adjacent mol-ecules into two-mol-ecule-wide chains along the a axis. The crystal packing is further stabilized by weak inter-molecular C-H⋯π and π-π inter-actions [centroid-centroid distance = 3.4441 (10) Å].

(E)-4-[(4-Fluoro-benzyl-idene)amino]-3-[1-(4-isobutyl-phen-yl)eth-yl]-1-(morpholino-meth-yl)-1H-1,2,4-triazole-5(4H)-thione methanol hemisolvate.

In the title compound, C(26)H(32)FN(5)OS·0.5CH(4)O, the methyl group of the methanol solvent mol-ecule is disordered over two sites with equal occupancies and the solvent is further disordered about a crystallographic twofold rotation axis. The organic mol-ecule exists in a trans configuration with respect to the acyclic C=N bond. An intra-molecular C-H⋯S hydrogen bond generates an S(6) ring motif. The morpholine ring adopts a chair conformation. The essentially planar 1,2,4-triazole ring [maximum deviation = 0.013 (2) Å] forms dihedral angles of 11.21 (10) and 67.53 (11)°, respectively, with the fluoro-phenyl unit and the isobutyl-substituted benzene ring. The crystal structure is stabilized by a weak inter-molecular C-H⋯π inter-action.

Poly[[aquadi-µ(3)-malonato-hexaphenyl-ditin(IV)] acetone solvate].

The asymmetric unit of the title polymeric complex, {[Sn(2)=(C(6)H(5))(6)(C(3)H(2)O(4))(H(2)O)]·C(3)H(6)O}(n), comprises of two Sn cations, one malonate anion and a non-coordinating acetone solvent mol-ecule. Both crystallographically independent Sn cations are five-coordinated by two O and three C atoms in a distorted trigonal-bipyrimidal geometry. One of the Sn cations is bridged by the malonate units, affording polymeric chains which run along [001]. Weak intra-molecular C-H⋯π inter-actions stabilize the mol-ecular structure. In the crystal structure, adjacent chains are inter-connected by inter-molecular O-H⋯O and C-H⋯O hydrogen bonds into a three-dimensional supra-molecular structure. A weak inter-molecular C-H⋯π inter-action is also observed.

3-(2,3-Dimethyl-5-oxo-1-phenyl-2,5-di-hydro-1H-pyrazol-4-yl)sydnone.

IN THE TITLE SYDNONE COMPOUND [SYSTEMATIC NAME: 3-(2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazol-4-yl)-1,2,3-oxadiazol-3-ium-5-olate], C(13)H(12)N(4)O(3), the oxadiazole and pyrazole rings are essentially planar [maximum deviations = 0.006 (1) and 0.019 (1) Å, respectively] and are inclined at inter-planar angles of 37.84 (4) and 46.60 (4)°, respectively, with respect to the benzene ring. In the crystal, adjacent mol-ecules are inter-connected into a three-dimensional supra-molecular network via inter-molecular C-H⋯O hydrogen bonds. Weak inter-molecular π-π aromatic stacking inter-actions [centroid-centroid distance = 3.5251 (5) Å] further stabilize the crystal packing.

4-Formyl-3-p-tolyl-sydnone.

In the title compound, C(10)H(8)N(2)O(3), the oxadiazole ring is essentially planar, with a maximum deviation of 0.006 (1) Šfor the two-connected N atom. The mean planes through the aldehyde unit and the methyl-substituted phenyl ring make inter-planar angles of 13.60 (9) and 59.69 (4)°, respectively, with the oxadiazole ring. In the crystal structure, adjacent mol-ecules are inter-connected into a two-dimensional array parallel to (100) by inter-molecular C-H⋯O hydrogen bonds.

4-[3-(1-Naphthyl-oxymeth-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thia-diazin-6-yl]-3-p-tolyl-sydnone.

In the title sydnone compound, C(24)H(18)N(6)O(3)S {systematic name: 4-[3-(1-naphthyl-oxymeth-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thia-diazin-6-yl]-3-p-tolyl-4,5-dihydro-1,2,3-oxadiazol-3-ium-5-olate} an intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. The 3,6-dihydro-1,3,4-thia-diazine ring adopts a twist-boat conformation. The essentially planar 1,2,3-oxadiazole and 1,2,4-triazole rings [maximum deviations of 0.006 (1) and 0.008 (1) Å, respectively] are inclined to one another at inter-planar angle of 44.11 (4)°. The naphthalene unit forms an inter-planar angle of 66.40 (4)° with the 1,2,4-triazole ring. In the crystal packing, pairs of inter-molecular C-H⋯O hydrogen bonds link adjacent mol-ecules into dimers incorporating R(2) (2)(12) ring motifs. Further stabilization is provided by weak C-H⋯π inter-actions.

4-(3,4-Dimethyl-5-phenyl-1,3-oxazolidin-2-yl)-2-methoxy-phenol.

In the title compound, C(18)H(21)NO(3), the oxazolidine ring adopts an envelope conformation with the N atom at the flap position. The two benzene rings make dihedral angles of 74.27 (14) and 73.26 (15)° with the mean plane through the oxazolidine ring. In the crystal structure, O-H⋯O and C-H⋯O hydrogen bonds connect adjacent mol-ecules into chains along [010] incorporating R(2) (2)(8) loops and further stabilization is provided by weak inter-molecular C-H⋯π inter-actions.