
%0 Journal Article
%A Craig, DC 
%A Goodwin, HA 
%A Onggo, D 
%T Steric Influences on the Ground State of Iron(II) in the Tris(3,3'-dimethyl-2,2'-bipyridine)Iron(II) Ion
%J Australian Journal of Chemistry
%D 1988/08/01
%V 41
%N 8
%P 1157-1169
%K 
%R https://doi.org/10.1071/CH9881157
%U https://www.publish.csiro.au/paper/CH9881157 
%X The tris ( ligand ) complex ions of iron(II) and nickel(II) with 3,3&#8242;-dimethyl-2,2&#8242;-bipyridine (L) are described. Salts of [FeL3]2+ display anomalously temperature-dependent magnetic and spectroscopic properties which arise from a temperature-induced singlet (1A1) &#8596; quintet (5T2) spin transition. The structures of [ML3][ClO4]2(M = Fe, Ni) have been determined and these reveal a strong twist (c. 37&#176;) of the pyridine rings about the C-C bridge. This forces the metal atoms out of the bonding planes of the donor nitrogen atoms and effectively reduces the interaction between L and the metal atoms. The average M-N distances are 2.064 &#506; (M = Fe) and 2.102 &#506; (M = Ni). Crystal data: the two complex salts are isostructural in monoclinic space group C2/c. [FeL3][ClO4]2: a 12.252(8), b 15.568(5), c 19.288(11) &#506;, &#946; 93.62(3)&#176;; Z 4; [NiL3][ClO4]2: a 12.255(5), b 15.619(4), c 19.419(9) &#506;, &#946; 93.23(2); Z 4. 
