K. Harada et al., D-F METAL-ION INTERACTION THROUGH FE-C N-LN BRIDGE BETWEEN DICYANOBIS(1,10-PHENANTHROLINE)IRON(II) COMPLEX AND LNCL(3), Chemistry Letters, (10), 1995, pp. 887-888
By adding lanthanoid ion (Ln) to a solution of non-charged iron(II) co
mplex, [Fe(CN)(2)(phen)(2)], the blue shift in MLCT band of the Fe(II)
complex was observed in ethanol, but was not in DMSO, The extent of t
he band shift depends on the lanthanoid ion size, which is explained b
y means of Fe-C=N-Ln interaction. In DMSO, however, the lanthanoid ion
is solvated too strongly to form the Fe-C=N-Ln bridging. The existenc
e of the bridging mode was confirmed by means of the crystal analysis
for a Fe2Yb2 tetranuclear complex.