Dichloro(4,10-dimethyl-1,4,7,10-tetraazabicyclo[5.5.2]tetradecane)iron(III) hexafluorophosphate
作者:James M. McClain II、Danny L. Maples、Randall D. Maples、Dallas L. Matz、Sebastian M. Harris、Andrew D. L. Nelson、Jon D. Silversides、Stephen J. Archibald、Timothy J. Hubin
DOI:10.1107/s0108270106040765
日期:2006.11.15
The title compound, [ FeCl2( C12H26N4)] PF6, is the rst mononuclear Fe3+ complex of an ethylene cross- bridged tetraazamacrocycle to be structurally characterized. Comparison with the mononuclear Fe2+ complex of the same ligand shows that the smaller Fe3+ ion is more fully encapsulated by the cavity of the bicyclic ligand. Comparison with the alpha- oxo dinuclear complex of an unsubstituted ligand of the same size demonstrates that the methyl groups of 4,10- dimethyl1,4,7,10- tetraazabicyclo[ 5.5.2] tetradecane prevent dimerization upon oxidation of the metal centre. N-ax - Fe3+ - Nax bond angles ( ax is axial), and thus the degree of encapsulation by the ligand, are quite different between the mononuclear and dinuclear mu-oxo species, which is probably the consequence of steric considerations.