Thermal studies of copper(II) squarate complexes of diamines in the solid state

Maji, T. K. ; Das, D. ; Sain, S. ; Ray Chaudhuri, N. (2002) Thermal studies of copper(II) squarate complexes of diamines in the solid state Journal of Thermal Analysis and Calorimetry, 68 (1). pp. 319-328. ISSN 1418-2874

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Official URL: https://link.springer.com/article/10.1023%2FA%3A10...

Related URL: http://dx.doi.org/10.1023/A:1014911205168

Abstract

CuL2C4O4 [L=ethane-1,2-diamine (en)],CuL2C4O4⋅2H2O [L=N-methylethane-1,2-diamine (meen), N-ethylethane-1,2-diamine (eten),N-propylethane-1,2-diamine (pren), N-methyl-N’-ethylethane- 1,2-diamine (meeten) andpropane-1,2-diamine (pn)],CuL2C4O4⋅0.5H2O [L=N,N’-dimethylethane- 1,2-diamine (dmeen)], CuL2C4O4⋅4H2O [L=propane-1,2-diamine (pn)]andCuL2C4O4⋅H2O[L=2-methylpropane-1,2-diamine (ibn)] have been synthesized by the addition of respective diamine to finely powdered CuC4O4⋅2H2O and their thermal studies have been carried out in the solid state. Cu(en)2C4O4 upon heating loses one molecule of diamine with shar pcolour change yielding Cu(en)C4O4 which upon further heating transforms to unidentified products. All aquated-bis-diamine species[CuL2C4O4⋅2H2O,CuL2C4O4⋅0.5H2O and CuL2C4O4⋅H2O] upon heating undergo deaquation–anation reaction in the solid state showing thermochromism and transform to CuL2C4O4, which revert on exposure to humid atmosphere (RH ∼90%). All the squarato bis-diamine species,CuL2C4O4, on further heating transform to unidentified products through the formation of CuLC4O4 as intermediates. The mono diamine species, have been isolated pyrolytically in the solid state and can be stored in a desiccator as well as in open atmosphere. They are proposed to be polymeric.

Item Type:Article
Source:Copyright of this article belongs to Springer Verlag .
Keywords:Copper(II) Complexes; Copper(II) Squarate; TG-DTA; Thermal Decomposition
ID Code:114735
Deposited On:29 May 2018 09:47
Last Modified:29 May 2018 09:47

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