
%0 Journal Article
%A Baker, AT 
%A Goodwin, HA 
%T The singlet-quintet transition in Tris[2-(pyridin-2-yl)benzothiazole]iron(II) Bis(tetraphenylborate)
%J Australian Journal of Chemistry
%D 1984/06/01
%V 37
%N 6
%P 1157-1162
%K 
%R https://doi.org/10.1071/CH9841157
%U https://www.publish.csiro.au/paper/CH9841157 
%X The tris[2-(pyridin-2-yl)benzothiazole]iron(II) ion has been isolated as the tetraphenylborate salt which is stable in the atmosphere for short periods. The deep red complex displays a temperature-dependent magnetic moment and thermochroism which are associated with a thermally induced singlet (1A1) &#8596; quintet (5T2) spin transition. An empirical treatment of the transition, which is continuous, yields &#8710;H and &#8710;S values of 22.7 kJ mol-1 and 91 JK-1 mol-1 over the range 275-364 K. Spectral data for the corresponding nickel(11) complex confirm the intermediate nature of the field strength of the benzothiazole and indicate that it is a weaker ligand than the corresponding thiazole derivative. 
