CYCLOALKANES AS LIGAND BACKBONES PART 5 - COORDINATION CHEMISTRY OF TRANS-2-PYRAZOL-1-YLCYCLOHEXAN-1-OL AND DERIVATIVES - SYNTHESIS, SPECTROSCOPIC FEATURES AND SOLID-STATE STRUCTURES OF FIRST AND 2ND ROW TRANSITION-METAL COMPLEXES

The synthesis and spectroscopic and structure chemical properties of c omplexes with the ligands trans-2-pyrazol-1-ylcyclohexan-1-ol (1), cis -(1-amino)(2-pyrazol-1-yl)cyclohexane (2) and 2-pyrazol-1-ylcyclohexan onoxime (4) coordinated to a variety of first and second row transitio n metals are described. These new systems bear cycloalkane backbones, which give rise to rigid ligand arrangements at the metal centre. X-ra y 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 t o their d(9) configuration, both octahedrally coordinated metal centre s show typical Jahn-Teller distortions with either loosely bound chlor o ligands or bridging CuCl42- anions occupying the epical positions. T he copper(II) complex [CuCl2(2)](2) .(6) forms dimers in the solid sta te, wherein the trigonal bipyramidally coordinated Cu centres are link ed by bridging chloro ligands. (C) 1998 Elsevier Science Ltd. All righ ts reserved.