
TY  - JOUR
A1  - Craig, DC 
A1  - Goodwin, HA 
A1  - Onggo, D 
T1  - Steric Influences on the Ground State of Iron(II) in the Tris(3,3'-dimethyl-2,2'-bipyridine)Iron(II) Ion
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1988
VL  - 41
IS  - 8
SP  - 1157
EP  - 1169
KW  - 
UR  - https://doi.org/10.1071/CH9881157 
N2  - 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. 
ER  -

