853200-95-0Relevant academic research and scientific papers
Crystal structure, spectroscopic studies, and nonlinear optical (NLO) properties of Schiff base metal complexes containing an N, S donor ligand
Xue, Zhao-Ming,Tang, Ying-Wen,Wu, Jie-Ying,Tian, Yu-Peng,Jiang, Min-Hua,Fun,Usman
, p. 1700 - 1706 (2004)
A new ligand, 4-dipropylaminobenzaldehyde thiosemicarbazone (abbreviated as HL), and its complexes ML2 (M = Ni, Pd, and Cu) have been synthesized and fully characterized by elemental analyses, EI-MS, IR and UV-vis spectroscopy, and photoluminescence measurements. All of the compounds exhibit a blue-green color with dual fluorescence in DMF solution. The quantum yield ratio (Φ(CT)/Φ(LE)) decreases in the order NiL2 > HL > PdL2 > CuL2. The ligand HL crystallizes in the monoclinic system, space group P21/n, with a = 15.1680, b = 8.5573, and c = 25.3920_A, β = 100.3457°, and V = 3242.2 A3. The nickel complex (NiL2) crystallizes in the triclinic system, space group P1, with a = 8.3093, b = 9.7540, and c = 10.2802 A, α = 101.383°, β = 107.693°, γ = 96.703°, and V = 764.12 A3. In these complexes, HL has lost a proton from its tautometric thiol form and acts as a single negatively charged bidentate ligand coordinating to the nickel ion via the mercapto sulfur and β-nitrogen atoms. The geometry around Ni(II) is almost square-planar with two equivalent Ni-N and two equivalent Ni-S bonds. The monomeric structure of HL or NiL2 is extended into an infinite two-dimensional network via hydrogen bonds. The two-photon absorption of HL and ML2 solutions (in DMF) was measured at 532 nm by the open-aperture Z-scan technique.
