Abstract
Two isostructural bimetallic tetranuclear chiral complexes, [K(18-crown-6)]3[Fe(ox)3]·9H2O and [K(18-crown-6)]3[Cr(ox)3]·9H2O, crystallize in rhombohedral R3 space group, the tetranuclear cluster is respectively built from one [Fe(ox)3]3− or [Cr(ox)3]3− species with three K(18-crown-6 ether) supramolecular cations linked by oxalate groups, and lattice water molecules form the double helical chains. Two complexes are second-harmonic-generation (SHG) active with the SHG response about 0.5 times that of urea.
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