Novel second-harmonic-generation-active lead(ii) phosphinate based on 2-carboxyethyl(phenyl)phosphinate ligand

摘要

The hydrothermal reaction of PbCl_2 with the achiral 2-carboxyethyl(phenyl)phosphinate ligand (H_2L) afforded a novel lead(ii) phosphinate that contains two enantiomers as a racemic mixture, namely, [Pb(HL)_2] (Λ- and Δ-1). Each enantiomer features a two-fold symmetrical chiral chain, in which the adjacent Pb~(2+) ions are doubly bridged by pairs of HL- ligands. The uni-oriented stacking of such 1D chains by edge-to-face π?π interactions results in its crystallization in the chiral C2 space group. Complex 1 shows a second harmonic generation response that is ～2 times that of KDP (KH_2PO _4).