PREPARATION AND SPECTRAL PROPERTIES OF BIS(HALOGENOACETATO) (BETA,BETA',BETA''-TRIAMINOTRIETHYLAMINE)COBALT(3) COMPLEXES

Bis(halogenoacetato)(triaminotriethylamine)cobalt(III) complexes, [Co(halac)2(tren)]ClO4 (halac = CF3CO2-, CH2ClCO2-, CHCl2CO2-, CCl3CO2-, CH2BrCO2-, CHBr2CO2-, and CBr3CO2-), have been prepared from carbonato(triaminotriethyl-, amine)cobalt(III) perchlorate, and their infrared and electronic absorption spectra have been examined. Assignments of the bands arising from the amino groups have been made by a comparison of the spectra with those of the deuterated complexes, [Co(tren-d6)Cl2]Cl.0.5H2O and [Co(tren-d6)Br2]Br. Comparison of the visible spectra of these tren complexes with the spectra of the corresponding tetraammine, bis(ethylenediamine), and triethylenetetramine (trien) complexes suggests that the ligand field strength of tren ligand is between that of ethylenediamine and ammonia. © 1969, American Chemical Society. All rights reserved.