Kinetic Analysis of Thermogravimetric Data XXXII. DSC Study of Some [Co(Diox·H)2(amine)2]X and H[Co(Diox·H)2(N3)2] Type Complexes with Alicyclic α-dioximes |
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| Authors: | Zsakó J Várhelyi Cs Marcu Gh Liptay G |
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| Institution: | (1) Faculty of Chemistry, 'Babeş-Bolyai', University, 3400 Cluj, Romania;(2) Department of Inorganic Chemistry, Technical University, 1521 Budapest, Hungary |
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| Abstract: | 14 mixed Co(III) dioximine chelates of the types Co(Diox·H)2(amine)2]X (X = Br, I, NO3, ClO4) and HCo(Diox·H)2(N3)2], respectively (Diox·H2-1,2-cyclohexane dione dioxime (nyoxime), 1,2-cycloheptane dione dioxime (heptoxime) 1,2-cyclooctane dione dioxime (octoxime)
were obtained and their thermal decompositions were studied in an argon atmosphere. After the dehydration of the crystallohydrates,
both types of complexes exhibit 3 decomposition stages. For the Co(Diox·H)2(amine)2]X type complexes (X = Br, I) the first endothermal stage is the substitution of an amine molecule for the external sphere
anion and this process is followed by two exothermal decomposition stages. With HCo(Diox·H)2(N3)2] type complexes the first and third processes are relatively slow, but the second process is very fast, corresponding to
a vertical portion of the TG curves. From the TG curves kinetic parameters were derived for 11 processes and the validity
of a non-linear compensation law was observed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | dioximine complexes of Co DSC kinetic compensation effect kinetic parameters of thermal decomposition |
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