Copper(II) complexes of spirohydantoins. Synthesis, quantum-chemical, and spectroscopic study

A series of new Cu(II) complexes with important physiologically active cycl oalkane-5-spirohydantoines are synthesized reacting as a result of CuCl2 . 2H(2)O interaction with the ligands in alkaline water medium. Their structu res were studied using spectroscopic (IR and EPR) methods. For comparison, ab initio calculations of the structure and IR spectra of the corresponding Cu(II) complexes were also performed. It was proven that with cyclopentane -5 -spirohydantoins, distorted (flattened) tetrahedral structure is realize d Cu(L-H)(2)(H2O)(2), while with the higher cycloalkane-5-spirohydantoins l inear Cu(IT) complexes of the type CuL-H(OH) are formed.