Issue 38, 2010

An unusual discontinuity in the thermal spin transition in [Co(terpy)2][BF4]2

Abstract

Single crystal and powder samples of [Co(terpy)2][BF4]2 are low spin below 100 K but show a typically gradual thermal spin-transition on warming, centred near 270 K. However, the spin-crossover exhibits an unusual and pronounced discontinuity above room temperature, when the material is ca. 87% high-spin. A crystallographic study at nine temperatures between 30–375 K showed that the discontinuity is not caused by a phase transition or by changes in anion disorder. Rather, it may reflect the steric consequence of small changes in the nearest neighbour interactions between the cations as the spin transition progresses.

Graphical abstract: An unusual discontinuity in the thermal spin transition in [Co(terpy)2][BF4]2

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2010
Accepted
22 Jun 2010
First published
19 Aug 2010

Dalton Trans., 2010,39, 9008-9012

An unusual discontinuity in the thermal spin transition in [Co(terpy)2][BF4]2

C. A. Kilner and M. A. Halcrow, Dalton Trans., 2010, 39, 9008 DOI: 10.1039/C0DT00295J

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