The thermal stability of tris(methimazolyl)borates and their germanium complexes

Wallace, Dawn and Chalmers, Kirsten and Dodds, Christopher and Stepek, Iain and Armstrong, David and Berlouis, Leonard and Reglinski, John and Spicer, Mark (2014) The thermal stability of tris(methimazolyl)borates and their germanium complexes. European Journal of Inorganic Chemistry, 2014 (15). pp. 2569-2575. ISSN 1434-1948 (https://doi.org/10.1002/ejic.201301588)

Abstract

A series of methimazole-based soft scorpionate anions ([RTmMe]–, R = H, Ph, Me, nBu) bearing substitution at the bridgehead boron have been used to produce a series of germanium complexes of general formulae [Ge(RTmMe)2]I2. Structural analyses of the germanium complexes by X-ray crystallography reveal that they all contain an octahedral S6 coordination sphere. The scorpionate anions (as their Li or Na salts) and their germanium complexes have been studied by thermogravimetric analysis. This analysis suggests that the degradation pathway for the free scorpionate anions differs from that of the complexes. Both pathways involve the loss of a methimazole ring thereby supporting the view that cleavage of the boron–nitrogen bonds can occur under thermally aggressive conditions. As expected, the presence of the germanium alters the degradation profile of the anion. In contrast to the free anions, the four complexes all display a similar mechanism for degradation. Although the presence of the germanium enforces a conformational change in the anions, its presence does not significantly increase the stability of the boron–nitrogen bonds.

ORCID iDs

Dodds, Christopher ORCID: https://orcid.org/0000-0002-4590-0307

Berlouis, Leonard ORCID: https://orcid.org/0000-0002-7217-1680

Reglinski, John ORCID: https://orcid.org/0000-0002-0263-4168

Spicer, Mark ORCID: https://orcid.org/0000-0002-6000-5677

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  Item type:	Article
  ID code:	50763
  Dates:	Date Event May 2014 Published 8 April 2014 Published Online
  Subjects:	Science > Chemistry
  Department:	Faculty of Science > Pure and Applied Chemistry
  Depositing user:	Pure Administrator
  Date deposited:	10 Dec 2014 16:27
  Last modified:	11 Nov 2024 10:53
  URI:	https://strathprints.strath.ac.uk/id/eprint/50763