
TY  - JOUR
A1  - Boyd, PDW 
A1  - Lee, KS 
A1  - Zvagulis, M 
T1  - Spin Spin Interactions in Polynuclear Nickel(II) Complexes. a Magnetic and Structural Study of Binuclear Nickel(II) Complexes of Enolic 1,3,5-Triketonates
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1986
VL  - 39
IS  - 8
SP  - 1249
EP  - 1256
KW  - 
UR  - https://doi.org/10.1071/CH9861249 
N2  - The bulk magnetic susceptibilities of the binuclear nickel(II) complexes of the 1,3,5-triketonates from diethyl (2-oxocyclopentane- 1,3-diyl) bisglyoxylate (H2ecg) (1) and diethyl 2,4,6-trioxoheptanedioate (H2decg) (2) have been measured over the temperature range 6-300 K. Antiferromagnetic spin-spin coupling is observed in each case with Neel  temperatures in the range 45-65 K. The X-ray crystal structure of [Ni( ecg )( py )2]2.( py ) has been solved. The complex crystallizes with one pyridine of solvation in the space group P&#299; [a 10.507(1), b 13.384(1), c 9.992(1) &#506;, &#945; 103.004(9), &#946; 115.867(9), &#946; 86.857(10)&#176;, Z = 1]. The molecule is binuclear with two coplanar triketonate  dianions bridging the two six-coordinate nickel atoms through a di-&#956;-oxo linkage [Ni-Ob-Ni angle 102.0(1)&#176;]. Two pyridine molecules and four triketonate oxygen atoms are bound to each nickel atoms. Magnetostructural correlations are presented in comparison with binuclear copper(II) 1,3,5-triketonates. The marked decrease in spin-spin interaction in the nickel complexes is attributed to increasing metal-bridging oxygen bond lengths that decrease the efficacy of the &#963; antiferromagnetic pathway xy||Ob||xy and contributions from the ferromagnetic xy||Ob||z2 pathway. 
ER  -

