T. Frommel et al., BIS(P,P-DI-TERT-BUTYL-N-CYCLOHEXYLPHOSPHINIC AMIDATO-N,O)NICKEL(II) -WHETHER PLANAR OR TETRAHEDRAL - BOTH ISOMERS ARE PARAMAGNETIC, Angewandte Chemie, International Edition in English, 32(6), 1993, pp. 907-909
Complex 1 exists in the high-spin form regardless of whether Ni is sur
rounded by the bidentate ligands in a planar or tetrahedral fashion. T
hus, 1 is the second planar, high-spin Ni(II) complex and the first fo
r which both the planar and the tetrahedral forms could be characteriz
ed. The tetrahedral isomer predominates in solution; its Ni-O bonds ar
e shorter and its Ni-N bonds are longer than those of the planar isome
r.