-Bis(4-amino-pyridine-κ)bis-(quin-ox-aline-2,3-di-thiol-ato-κ ,')platinum(IV) dimethyl sulfoxide monosolvate.

In the structure of the title solvated complex, [Pt(CHNS)(CHN)]·CHOS or -[Pt(4-)(qdt)]·dmso (4- = 4-amino-pyridyl, CHN; qdt = quinoxaline-2,3-di-thiol-ate, CHNS; dmso = dimethyl sulfoxide, CHOS) the centrosymmetric complex exhibits Pt-S distances in agreement with other Pt-S bond lengths found in platinum(IV) di-thiol-ene complexes. The qdt ligands have inter-molecular inter-actions with an amine hydrogen atom on a 4- ligand (hydrogen bonding) and have sandwich π-π inter-actions with a neighboring qdt ligand.

1,1'-Methyl-enebis{4-[()-2-(pyridin-4-yl)ethen-yl]pyridinium} dibromide dihydrate.

The chevron-shaped cations of the title hydrated salt, CHN ·2Br·2HO, are arranged in back-to-back alternating directions to form a zigzag ribbon propagating along the [010] direction. Inter-molecular inter-actions comprising these ribbons are π-π inter-actions between the pyridinium and adjacent pyridyl rings, as well as O-H⋯O hydrogen bonding between water molecules and two adjacent pyridyl N atoms. Half of the cation is generated by the mirror plane.

1,1'-Methyl-enebis(4,4'-bipyridin-1-ium) dibromide.

The asymmetric unit of the title salt, CHN ·2Br, comprises half of the mol-ecule and a bromide ion. The chevron-shaped cations stack as columns in the [001] direction with suitable inter-molecular distance for π-π inter-actions. These cationic columns are further stabilized by inter-columnar C-H⋯N hydrogen bonding with the bromide ions distributed between them.

-Diamminebis(1,2-di-cyano-ethene-1,2-di-thiol-ato)platinum(IV).

The title compound, [Pt(CNS)(NH)], represents an octa-hedral platinum(IV) complex with two ammine and two mnt (mnt = 1,2-di-cyano-ethene-1,2-di-thiol-ato) ligands. The Pt-N and Pt-S distances are consistent with those in other platinum(IV) complexes. As a result of a slight canting of the coordination of the mnt ligand to the platinum(IV) atom, the nitrile nitro-gen atoms are positioned suitably to hydrogen-bond with adjacent ammines.

Crystal structure of (3E,5E)-3,5-bis-[4-(di-ethyl-aza-nium-yl)benzyl-idene]-1-methyl-4-oxopiperidin-1-ium trichloride dihydrate: a potential biophotonic material.

In the trication of the title hydrated mol-ecular salt, C28H40N3O(3+)·3Cl(-)·2H2O, the central heterocyclic ring adopts a sofa conformation, with the exocyclic N-C bond in an equatorial orientation. The dihedral angles between the planar part of this heterocyclic ring and the two almost flat side-chain fragments, which include the aromatic ring and bridging atoms, are 28.8 (1) and 41.

1-Benzyl-3,5-bis-(4-chloro-benzyl-idene)piperidin-4-one.

The title compound, C(26)H(21)Cl(2)NO, crystallizes with two symmetry-independent mol-ecules (A and B) in the asymmetric unit. In both mol-ecules, the central heterocyclic ring adopts a sofa conformation. The dihedral angles between the planar part of this central heterocyclic ring [maximum deviations of 0.

3,5-Bis(4-chloro-benzyl-idene)-1-methyl-piperidin-4-one.

In the title mol-ecule, C(20)H(17)Cl(2)NO, the central heterocyclic ring adopts a flattened boat conformation. The dihedral angles between the planar part of this central heterocyclic ring [maximum deviation = 0.004 (1) Å] and the two almost planar side-chain fragments [maximum deviations = 0.

2-Amino-4-(2-methoxyphenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile and 2-amino-4-(2-methoxyphenyl)-7,7-dimethyl-3-nitro-4,6,7,8-tetrahydro-5H-chromen-5-one hemihydrate.

Calculations of the conformational preferences of the methoxyphenyl substituent with respect to the pyran ring have been carried out for the two title compounds, C19H20N2O3, (II), and C18H20N2O5.0.5H2O, (III).

Polymorphism and solvolysis of 2-cyano-3-[4-(N,N-diethylamino)phenyl]prop-2-enethioamide.

Two new polymorph forms, (Ia) and (Ib), of the title compound, C(14)H(17)N(3)S, and its solvate with acetonitrile, C(14)H(17)N(3)S.0.25C(2)H(3)N, (Ic), have been investigated.

N,N-dimethyl-N'-[(1E,2E)-3-(4-nitrophenyl)prop-2-enylidene]benzene-1,4-diamine and N,N-dimethyl-4-[(1E,3E)-4-(4-nitrophenyl)buta-1,3-dienyl]-1-naphthylamine.

Syntheses and X-ray structural investigations have been carried out for the two title compounds, viz. C(17)H(17)N(3)O(2), (I), and C(22)H(20)N(2)O(2), (II). The molecular skeleton of (I) is slightly non-planar; the dihedral angles between the conjugated linkage and the p-(dimethylamino)phenyl ring, and between the linkage and the p-nitrophenyl ring are 13.