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Thermal Decomposition of Copper(II) Squarate
Author(s) -
Brown Michael E.,
Galwey Andrew K.,
Beck Michael W.
Publication year - 1982
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198200042
Subject(s) - chemistry , dehydration , decomposition , thermal decomposition , copper , arrhenius equation , anhydrous , chemical decomposition , isothermal process , nickel , inorganic chemistry , kinetics , atmospheric temperature range , activation energy , organic chemistry , thermodynamics , biochemistry , physics , quantum mechanics
A kinetic and thermochemical study has been made of the dehydration, decomposition and oxidation reactions of copper(II) squarate dihydrate, CuC 4 O 4 · 2H 2 O. In contrast to results obtained for the nickel(II) salt, the copper salt undergoes preliminary dehydration in a temperature range (410–440 K) appreciably below that for decomposition (590–620 K). The anhydrous material is then more stable than nickel squarate (560–600 K). The major decomposition products in nitrogen are Cu and CO and the reaction may proceed further to CuO and CO 2 in an oxyen atmosphere. Values for the enthalpies of dehydration, decomposition and oxidation are reported. Isothermal DSC was used to study the kinetics of dehydration and of decomposition and results were analyzed using relative‐rate reduced‐time (RRRT) curves. The dehydration conforms to the Avrami—Erofe'ev expression, whereas the decomposition approximates closely to the contracting area model. Apparent Arrhenius parameters are reported.