Triethanolamine copper chloride prepared from zerovalent metal: another polymorph of a known Cu(II)compound or a mixed-valence complex with all-trigonal bipyramidal copper?

摘要

Two new copper complexes with triethanolamine(H_3L)have been prepared using copper powder and characterized by X-ray crystallography, IR and EPR spectroscopy . these are [Cu~I(H_3L)Cl]_x.[Cu~II(H_2L)Cl]_1-x(X=0; 2/3)(1)and[Cu~II(H_2L)SCN](2). Both complexes are neutral species and contain copper atoms in trigonal bipyramidal environments. The important dimensions in 1 are Cu-N 2.011(5),5Cu-O 2.073(3),Cu-Cl 2.239(2)A and N-Cu-Cl=180.0°; in 2 Cu-N_NCS 1.918(3),Cu-N_H2Tea 1.983(3), Cu-O 2.004(2), 2Cu-O 2.13(1)A and N_H2Tea-Cu- N_NCS=174.6(1)°.