The new inorganic-organic hybrid complex of Zn(II) with 5-Chloro-2,4-dimethoxyaniline, (5-Cl-2,4-(OCH 3 ) 2 C 6 H 2 NH 3 ) 2 ZnCl 4 .3H 2 O, has been prepared and characterized by X-ray crystallography. The complex crystallizes in the triclinic space group P1 with a = 7.4614 (2), b = 9.8734 (2), c = 18.5678 (4) Å, = 102.3578 (14), = 91.0686 (15), = 91.2373 (12)°, V = 1335.49 (5) Å 3 , Z = 2. Crystal structure has been determined and refined to R = 0.035 and R w = 0.036 using 5107 independent reflections. In the atomic arrangement of the title compound, ZnCl4 2inorganic entities, water molecule and -NH 3 + groups have a layered organization around the planes z = 1/4 and z = 3/4. The crystal structure is stabilized by N-H…O, O-H…O, N-H…Cl and O-H…Cl hydrogen bonds.

(C6H18N3)4[CuCl5]2[CuCl4]3ꞏ1.42H2O has been prepared and characterized by various physicochemical techniques. Single crystal X-ray diffraction structural analysis has revealed that the title compound belongs to the orthorhombic system with space group Cmca. Its unit cell dimensions are: a = 24.286 (2) Å, b = 14.3082 (14) Å, c = 16.6160 (16) Å, with Z = 4, V = 5773.8 (10) Å 3 and its crystal structure was determined and refined down to R= 0.024 and wR (F 2) = 0.059. The structure contains three crystallographically independent Cu 2+ ions coordinated to chlorine anions in various fashions. Cu1 is five-coordinated, in a distorted square pyramidal fashion, while Cu2 and Cu3 are tetra-coordinated in square planar and distorted tetrahedral fashions, respectively. The entities are interconnected by means of hydrogen bonding [O(W)-H…Cl, N-H…Cl, C-H…Cl and C-H…O(W)] forming a three-dimensional network. Intermolecular interactions were investigated by Hirshfeld surfaces and the contacts of the eight different chloride atoms were notably compared. The vibrational absorption bands were identified by infrared spectroscopy. The optical study was investigated by UV-vis absorption.

The new complex of Zn(II) with 4-ammino-2,2,6,6-tetramethylpiperidine, [C9H22N2]ZnCl4, has been prepared and characterized by various physicochemical studies. This compound crystallizes in the monoclinic system, with the space group P21/c and the following cell parameters: a = 9.8682(7), b = 7.5164(5), c = 21.019(2) Å, β = 99.003 (7)°, V = 1539.8(2) Å3and Z = 4. The crystal structure was solved and refined to R = 0.024 using 3070 reflections. The atomic arrangement can be described by slightly distorted tetrahedral ZnCl42-anions and 4-ammmonio-2,2,6,6-tetramethylpiperidinium cations holding together by different interactions. The four chlorine atoms of the ZnCl42-tetrahedron are acting as acceptors of hydrogen bonds. The crystal packing is influenced by cation-to-anion N-H…Cl and C-H…Cl hydrogen bonds leading to open framework architecture.

A new organic-inorganic hybrid material, 1-amonioethylpiperazine-1, 4-diium tetrachloridozincate(II) chloride, (C6H18N3)[ZnCl4]Cl, has been synthesized and characterized by various physicochemical techniques including UV-visible absorption, Infra-Red (IR), Raman and NMR spectroscopies. The compound crystallizes in the monoclinic system and P21 space group with Z = 2 and the following unit cell dimensions: a = 7.1728 (6), b = 12.4160 (11),

A 0-dimensional (0D) hybrid compound, (C6H22N4)2H9O4CdCl6CdCl5Cl2 has been prepared by a facile conventional evaporation method. The crystal packing of discrete constituents of [Cd(1)Cl6] octahedra, [Cd(2)Cl5] trigonal bipyramids, Cl– ions, protonated tris(2-aminoethyl)amine molecules ([(C2H7N)3NH]4+) and H9O4+ ions, is stabilized by diverse hydrogen bonds of N-H···Cl, C-H···Cl and C-H···O. Uncommonly, an isolated chlorine ion (i.e. Cl(4)) is fixed at a special position at 12c(3.) by hydrogen bonds from four surrounding hydrogen atoms at a trigonal pyramidal configuration whereas other chlorine atoms Cl(1), Cl(2) and Cl(3) are stabilized by hydrogen bonds from 2, 2 and 3 hydrogen atoms at bifurcated, linear and trigonal configurations, respectively. The ordered arrangement of [Cl(4) [Cl(4)···H4] trigonal pyramidal configuration upward or downward is responsible for the long c-axis of the title compound. Additionally, a H9O4+ ion is entangled with symmetry restriction and half occupancy. All these features of the title compound add our new knowledge about hydrogen bonds.