Author :
Amirnasr, M.,Vafazadeh, R.,Alavi-Shoushtari, S
Abstract :
The solid state kinetic parameters for deamination-anation of trans-[Co(acacen)(amine)***2].NCS (with amine = piperidine (pprdn), 1, benzylamine (bzlan), 2, morpholine (mrpln), 3, pyrrolidine (prldn), 4, and acacen = N,N-ethylenebis(acetylacetoneiminato) dianion) have been studied by thermogravimetric measurments under both isothermal and nonisothermal conditions, and compounds 1. 3 and 4 produce trans-[Co(acacen)(amine)(NCS)], whereas compound 2 gives trans-[Co(acacen)(amine)(SCN)].The values of the activation energy and the activation entropy were 112.5 +- 15.9 kj mol**-1 and -49.8+- 4.9 j k**-1 mol**-1 for 1 , 126.5+- 2.3 kj mol**-1 and -512.1+- 6.7 j k**-1 mol**-1 for 2,98.0+- 8.3 kj mol**-1 and -102.0+-2.5 j k**-1 mol**-1 for 3, and 132.0+- 19.7 kj mol**-1 and -151+- 5.9 j k**-1 mol**-1 for 4. A dissociative mechanism is proposed with an activated complex of square-based-pyramidal geometry.
