Maisara Abdul Kadir

Synthesis and crystal structure of N-6-[(4-pyridylamino)carbonyl]-pyridine-2-carboxylic acid methyl ester zinc complex

A reaction between monoamide ligand namely N-6-[(4-pyridylamino)carbonyl]-pyridine-2-carboxylic acid methyl ester (L4) and zinc chloride has been attempted in order to generate a carboxylate complex suitable for anion inclusion. This reaction gives rise to a formation of discrete complex with general formula [ZnCl2(L4)2]. Complex [ZnCl2(L4)2] crystallizes in the monoclinic space group, P21/c, with one zinc(II) center, one molecule of ligand L4, one coordinated chloride and one methanol molecule in the asymmetric unit. The extended structure of this molecule shows that the zinc atom is coordinated by four donors: two L4 and two chloride anions. The zinc atom adopts distorted tetrahedral geometry with the angles between the donors in the range 103.62(11)-122.74(8)°. In this study, the amide cavity is bound with methanol through hydrogen-bonding interactions. The methanol molecules is hydrogen bonded to the amide moiety with bond lengths O30-H8···O12 and N17-H17···O30 of 1.988 and 2.078 Å, respectively.

1-(4-Chloro­butano­yl)-3-(2-nitro­phen­yl)thio­urea

The asymmetric unit of the title compound, C11H12ClN3O3S, contains two independent molecules with different conformations in which the benzene ring and the thiourea fragment form dihedral angles of 87.28 (12) and 66.44 (10)°. The O atom of the thioamide group is involved in bifurcated N—H⋯O intra- and intermolecular hydrogen bonding; the latter interaction links the independent molecules into a dimer. In the crystal, N—H⋯S interactions link the molecules into chains propagating along the c axis.

N-(2,2-Dimethyl-propano-yl)-N'-(2-meth-oxy-phen-yl)thio-urea.

In the title compound, C13H18N2O2S, the carbonylthiourea fragment is nearly planar with an r.m.s. deviation of 0.0096 Å. The dihedral angle between carbonylthiourea group and the benzene ring is 19.16 (16)°. There are two intramolecular N—H⋯O hydrogen bonds, which lead to two pseudo-six-membered rings. Weak intramolecular C—H⋯S hydrogen bonding also occurs.

Bis{N-[methoxy(4-methylbenzamido)methyl]-2,4-dimethylanilinido-κ2N,O}copper(II)

In the centrosymmetric mononuclear title complex, [Cu(C18H20N2O2)2], the CuII atom is four-coordinated in a trans-CuN2O2 square-planar geometry with the N—Cu—O chelate angle being 89.97 (11)°. The dihedral angles made by the planes defined by the aromatic ring carbons of the 4-methylbenzene and 2,4-dimethylbenzene fragments with the plane defined by the chelate ring are 13.43 (15) and 82.69 (13)° respectively. The angle between the planes defined by the aromatic carbons of the two rings is 89.40 (16)°. A a weak intramolecular C—H⋯N hydrogen bond occurs.

1-(4-Chloro­benzo­yl)-3-(3-methyl­pyridin-2-yl)thio­urea

The molecule of the title compound, C14H12ClN3OS, consists of three approximately planar fragments: the central thiourea group, the chlorophenyl group and the picolyl (3-methylpyridin-2-yl) group with a maximum of 0.035 (2)° for an N atom from the mean square plane of the central thiourea group. The central fragment forms dihedral angles of 33.30 (8) and 76.78 (8)° with the chlorophenyl and picolyl groups, respectively. With respect to the thiourea C—N bonds, the 4-chlorobenzoyl group is positioned trans to the thiono S atoms, whereas the picolyl group lies in a cis position to it. The molecular conformation is stabilized by an intramolecular N—H⋯O hydrogen bond. In the crystal, molecules are linked by intermolecular C—H⋯N hydrogen bonds, forming chains along the a axis.