Cycloalkanes as ligand backbones part 5 [1] coordination chemistry of trans-2-pyrazol-1-ylcyclohexan-1-ol and derivatives : Synthesis, spectroscopic features and solid state structures of first and second row transition metal complexes

Article abstract of DOI:10.1016/S0277-5387(97)00499-3

The synthesis and spectroscopic and structure chemical properties of complexes with the ligands trans-2-pyrazol-1-ylcyclohexan-1-ol (1), cis-(1-amino)(2-pyrazol-1-yl)cyclohexane (2) and 2-pyrazol-1-ylcyclohexanonoxime (4) coordinated to a variety of first and second row transition metals are described. These new systems bear cycloalkane backbones, which give rise to rigid ligand arrangements at the metal centre. X-ray crystallographic investigations of the copper(II) complexes CuCl₂(1)₂ · (H₂O)₂ (5e) and [Cu(1)₂](CuCl₄) (5f) proved the coordination of two different enantiomers of ligand 1 to one copper centre. Owing to their d⁹ configuration, both octahedrally coordinated metal centres show typical Jahn-Teller distortions with either loosely bound chloro ligands or bridging CuCl^2-₄ anions occupying the apical positions. The copper(II) complex [CuCl₂(2)]₂ · (6) forms dimers in the solid state, wherein the trigonal bipyramidally coordinated Cu centres are linked by bridging chloro ligands.