Search

(N2H5)3[GaF6] contains GaF63− octahedra arranged in a distorted cubic close-packed manner and linked to hydrazinium(1+) ions via N—H⋯F hydrogen bonds. (N2H6)[GaF5(H2O)] contains [GaF5(H2O)]2− octahedra arranged in a similar distorted cubic close packing manner; in addition to N—H⋯F hydrogen bonds to hydrazinium(2+) ions, these octahedra are also linked directly via O—H⋯F hydrogen bonds.

The compounds ethyl (E)-2-benzoyl-3-(dimethylamino)propenoate, C 14 H 17 NO 36 (I), ethyl (Z)-2-benzoyl-3-[(3nitrophenyl)amino]propenoate, C 18 H 16 N 2 O 5 (II), and methyl (Z)-3-[(4,6-dimethyl-2-pyrimidinyl)amino]-2[(methoxy)(methylthio)methyleneamino]propenoate, C 13 H 18 N 4 O 3 S (III), are propenoates with different substituents at the C(2) = C(3) double bond. C(2) bears benzoyl and ethoxycarbonyl groups in (I) and (II) and (methoxy)(methylthio)methyleneamino and methoxycarbonyl groups in (III), whereas C(3) is substituted with dimethylamino in (I), 3-nitrophenylamino in (II) and 4,6-dimethyl-2-pyrimidinylamino in (III). The configuration with respect to the C(2) = (3) double bond is E in (I) and Z in (II) and (III). Bulky substituents such as the benzoyl and (methoxy) (methylthio) methyleneamino groups are turned out of the best plane through the rest of molecule

The compound methyl (1'S,8S,10S)-6-chloro-9,10-dihydro-12,12-dimethyl-10-(D-erythritol-1-yl)-8H,12H-pyrazolo[1',2':1,2]pyrazolo[4,3-d]tetrazolo[1,5-b]pyridazine-8-carboxylate, C 16 H 22 ClN 7 O 6 , (1), is an example of a new C-nucleoside. Both (1) and dimethyl (6-chloro-9,10-dihydro-12,12-dimethyl-10-phthalimidomethyl-8H,12H-pyrazolo[1',2':1,2]pyrazolo[4,3-d]tetrazolo[1,5-b]pyridazine-8,9-dicarboxylate, C 23 H 21 ClN 8 O 6 , (II), contain heterocyclic systems consisting of four condensed fused rings. In each compound, the tetrazole ring is planar to within experimental error; the pyridazine ring and the pyrazole ring, which is fused to the pyridazine ring, deviate slightly from planarity, as does the phthalimido group of (II)

The molecular structures of three substituted 3-amino-2-benzoylaminopropenoic acid derivatives, methyl (Z)-2-benzoylamino-3-dimethylaminopropenoate (A), methyl (Z)-2-benzoylamino-3-(4,6-dimethyl-2-pyrimidinylamino)propenoate (B) and N-[(Z)-2-benzoylamino-3-(4,6-dimethyl-2-pyrimidinylamino)propenoyl]-L-proline monohydrate (C), show that the configuration around the exocyclic C=C double bond is Z. The mechanisms of syntheses of (B) and (C) from (A) are confirmed as the Z configuration is preserved in the title compounds

The Mo atoms in the title compounds, i.e. triethyl­ammonium cis-tetra­chloro­bis(4-ethyl­pyridine-N)­molybdate(III), cis-(C6H16N)­[MoCl4(C7H9N)2], and trans-tetra­chloro­bis(4-ethyl­pyridine-N)molybdenum(IV), trans-[MoCl4(C7H9N)2], are six-coordinate with octahedral geometry. The Mo atom in the latter complex lies on a site with crystallographic 2/m symmetry.

In the title compound, [Cu(C 2 H 3 O 2 ) 2 (C 6 H 8 N 2 ) 2 ], the Cu atom is surrounded by two O atoms from the two mono-dentate acetate ligands and by two pyridine N atoms from the two 2-amino-6-methylpyridine ligands in a trans square-planar arrangement. The Cu-O and Cu-N distances are 1.952(2) and 2.046 (2) A, respectively. The complex has an inversion centre. The remaining carboxylate O atoms are located at 2.764 (3) A from the Cu atom, above and below this plane. The coordination around the Cu atom can therefore be described as (4+2). The pyridine ring is twisted 73.2 (1)° with respect to the plane formed by the Cu, the N and the more strongly bonded O atoms.

The Cu II atom in [Cu(C 7 H 5 O 3 ) 2 (C 6 H 6 N 2 O)2(H 2 O)) 2 is octahedrally coordinated by N atoms from two nicotinamide ligands [at 2.018(2) and 2.019 (2) A], by O atoms of two salicylate ligands [at 1.9656(19) and 1.9762(19) A], and by trans water molecules at considerably different distances [2.373 (3) and 2.894 (4) A]. Neutral monomeric units are held together by hydrogen bonds through water molecules and N and O atoms of the CONH 2 group of nicotinamide and carboxylate groups.

The structure of octa-μ-methoxo-octa-μ-oxo-octa­oxotetra­pyridine­octa­molybdenum(V), [Mo8O16(CH3O)8(C5H5N)4], consists of discrete puckered cyclic molecules, made up of eight Mo atoms which are linked together by pairs of oxo bridges and pairs of bridging methoxy groups. It may also be regarded as a linkage of four [Mo2O4]2+ units, whose two Mo centres differ in their coordination by the pyridine ligand. Short Mo—Mo distances, 2.570 (1) A, alternate with longer Mo⋯Mo contacts, 3.435 (1) A.

The structure of the title compound, Na2[Zn(C6H11O2)4], consists of two-dimensional polymeric sheets. The Zn2+ ions are approximately tetrahedrally coordinated by O atoms from different hexanoate anions. Both Na+ ions are six-coordinated by carboxyl­ate O atoms. One of the hexanoate O atoms is attached to one Zn2+ ion and one Na+ ion, and the remaining O atom is attached to two Na+ ions.

C 8 H 10 N 4 O 2 cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 . Affinement de la structure jusqu'a 0,069