Abstract
The structure of the title compound, cis-[CrCl(cycb)(H2O)][ZnCl4]·3H2O (cycb is rac-5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane; C16H36N4), has been determined from synchrotron data. In the complex cation, the Cr(III) ion is bound by four N atoms from the tetra-dentate cycb ligand, a chloride ion and one water mol-ecule in a cis arrangement, displaying a distorted octa-hedral coordination geometry. The distorted tetra-hedral [ZnCl4](2-) anion and three additional water mol-ecules remain outside the coordination sphere. The Cr-N(cycb) bond lengths are in the range of 2.0837 (14) to 2.1399 (12) Å while the Cr-Cl and Cr-(OH2) bond lengths are 2.2940 (8) and 2.0082 (13) Å, respectively. The crystal packing is stabilized by hydrogen-bonding inter-actions between the N-H groups of the macrocyclic ligand, the O-H groups of the water mol-ecules and the Cl atoms of the tetra-chlorido-zincate anion, leading to the formation of a three-dimensional network.
Highlights
The structure of the title compound, cis-[CrCl(cycb)(H2O)][ZnCl4]3H2O, has been determined from synchrotron data
The distorted tetrahedral [ZnCl4]2 anion and three additional water molecules remain outside the coordination sphere
The crystal packing is stabilized by hydrogen-bonding interactions between the N—H groups of the macrocyclic ligand, the O—H groups of the water molecules and the Cl atoms of the tetrachloridozincate anion, leading to the formation of a three-dimensional network
Summary
Chromium(III) complexes containing C-meso or racemic5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (cyca and cycb) ligands are known to exist in trans or cis octahedral coordination geometries when combined with two auxiliary ligands (House et al, 1983; Eriksen & Mønsted, 1983). The cycb ligand readily folds to form the cis isomer while the cyca ligand only folds with difficulty into the trans isomer. Infrared and electronic absorption spectral properties are useful in determining the geometric isomers of CrIII complexes with mixed ligands (Choi et al, 2004; Choi & Moon, 2014; Moon & Choi, 2015). In order to study the molecular structure and crystal packing mode of a complex containing CrIII, the cycb ligand and a. ZnCl42 counter-anion, we report on the preparation and crystal structure of cis-[CrCl(cycb)(OH2)]ZnCl43H2O,
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
