Molecular Recognition of Hexaaqua Transition Metal(<scp>II</scp>) Ions

Abstract

Six OH…︁O contacts in the second coordination sphere are formed when the octahedral neutral complexes [MIIIL] (1, M  Cr, Fe; for L see the structural formula on the right) react in acetone with [M′II(OH2)6]2+ ions (M′  Mn, Co, Ni, Zn) to give the complexes [1{M′II(OH2)6}1]2+. In contrast, [CoIIIL] coordinates in the first coordination sphere to give the complexes [LCoM′IICoL]2+.