Spacer-armed binuclear copper(ii) complexes with salicylidene hydrazones of N-benzoylaminodicarboxylic acids
摘要:
The structure and EPR spectra of copper(II) complexes with bis(salicylidene)hydrozones of N-benzoyl-L-aspartic and N-benzoyl-L-glutamic acids have been described. The compounds have been studied by chemical and thermal analyses, IR spectroscopy, and EPR spectroscopy. The molecular and crystal structure of the copper(II) complex with bis(salicylidene)hydrozone of N-benzoyl-L-aspartic acid (H4L) of composition [Cu2L center dot 2Py] center dot 2CH(3)OH center dot H2O has been determined by X-ray single-crystal diffraction. The crystals are monoclinic: a = 10.3316(7) , b = 16.7552(9) ,c = 11.0137(6) , beta = 105.758(3)A degrees, space group P2(1), Z = 2. The complex has a polymeric structure composed of alternating copper-containing binuclear fragments bound to each other either via phenoxy bridges or via an aliphatic spacer (the CuaEuro broken vertical bar Cu distances are 3.471 and 8.939 , respectively). The EPR spectra of the solutions of the complexes under study shows an isotropic signal comprising seven HFS lines due to two equivalent copper nuclei with the spin Hamiltonian parameters g = 2.115-2.122 and a (Cu) = (36.1-36.9) x 10(-4) cm(-1), which indicates the reaization of weak exchange coupling of the paramagnetic centers.