H. Furutachi et al., Bis(mu-oxo)(mu-hydroxo)triiron(III) and (mu-oxo)(mu-hydroxo)diiron(III) core complexes with tripodal ligands having a terminal carboxylate, CHEM LETT, (10), 2000, pp. 1132-1133
The tripodal ligands (6Me(2)-BPG and BPG) containing the carboxylate donor
afford two types of Fe-2(O)(OH) and Fe-3(O)(2)(OH) core complexes, dependin
g upon the methyl-substituent effect on the 6-position of the pyridyl ring.