Synthesis, crystal structure and nonlinear optical property of a Zinc(II) complex base on the reduced Schiff-base ligand

By hydrothermal reactions of Zn(II) nitrate with N-(4-carboxyl)benzyl-l-alanine acid (H2L), a novel Zn(II) complex, namely, [Zn(HL)2(H2O)2] (1), have been obtained. Single crystal X-ray diffraction analysis reveals that complex 1 crystallizes in the C2 space group and displays a 0D dimensional structure. The Zn(II) ions are four-coordinated and each Zn(II) ion coordinated with two HL anions forming a [Zn(HL)2(H2O)2] unit. The stacking of such units by hydrogen bonds results in its supramolecular structure. Complex 1 shows a second harmonic generation response that is ~ 1.5 times that of KDP (KH2PO4).