Kinetic Analyis of TG Data XXXV. Spectroscopic and thermal studies of some cobalt(III) chelates with ethylenediamine |
| |
| Authors: | J Zsakó G Pokol Cs Novák Cs Várhelyi A Dobó G Liptay |
| |
| Institution: | (1) Department of Mathematics and Natural Sciences, Transsylvanian Museum Association, RO-3400 Cluj, Romania;(2) Institute of General and Analytical Chemistry, University of Technology and Economics, 1521 Budapest, Hungary;(3) Central Chemical Research Institute, Budapest, Hungary |
| |
| Abstract: | A number of 30 Co(en)3 ]Y3 , Co(en)2 X2 ]Y and Co(en)2 X(amine)]Y2 type complexes (X =Cl, Br; Y =Cl, Br, I, NCO, NCS, NO3 , ClO4 , etc.; amine =aromatic and alkylamines) were obtained from trans-Co(en)2 Cl2 ]Cl by double decomposition and by substitution reactions, respectively. The structure of the complexes was proved by means
of far and middle FTIR spectra. The thermal decomposition was studied by TG, DTA and DSC measurements. Mass spectra were also
recorded. In the case of Co(en)3 ]Y3 complexes the nitrate, perchlorate and dimesoperiodates decompose suddenly, frequently explosion like. The halides and thiocyanates
seem to substitute an ethylenediamine ligand, yielding a rather unstable intermediate. The pyrolysis of Co(en)2 X2 ]Y type derivatives yields no relatively stable intermediates, but the decomposition temperatures may be correlated with
the nature of Y and with the cis or trans configuration of the compound. With the Co(en)2 X(amine)]Y2 type complexes one observes the formation of Co(en)2 XY]Y as intermediate product. From the TG curves kinetic parameters were derived for some dehydration and deamination processes,
by using the nomogram method. The validity of a non-linear kinetic compensation law was observed.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
| Keywords: | cobalt(III) complexes DSC DTA kinetics FTIR and IR spectra of Co(III) complexes TG |
| 本文献已被 SpringerLink 等数据库收录！ |
|
