Synthesis, crystal structures, and two-photon absorption properties of dithiocarbazate Zn(II) and Pd(II) complexes

Hong ping Zhou, Dong mei Li, Peng Wang, Le hua Cheng, Yuan hao Gao, Yong min Zhu, Jie ying Wu, Yu peng Tian, Xu tang Tao, Min hua Jiang, Hoong Kun Fun

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

A new bidentate Schiff base ligand (abbreviated as L) derived from the condensation of S-methyldithiocarbazate (SMDTC) with 9-fluorenone, and its complexes ML2 (M = Ni(II), Zn(II) and Pd(II)) have been synthesized and fully characterized by elemental analyses, IR, molar conductivity and UV-vis spectroscopy. The structures of complexes ZnL2 and PdL2 have been determined by X-ray diffraction analysis. Complex ZnL2 adopts a distorted tetrahedral geometry with the azomethine nitrogen atom and the thiolate sulfur atom. The coordination geometry about the Pd(II) is surprisingly a cis-configuration square-planar formed by the Pd(II) atom coordinating to the NS bidentate ligand. Detailed crystal structure analyses show that the cis-positioning of the two ligands was stabilized by the π-π stacking interactions between the two delocalized diazafluorene moieties. The two-photon absorption of L and ML2 solutions (in DMF) was measured at 532 nm by the open-aperture Z-scan technique.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalJournal of Molecular Structure
Volume826
Issue number2-3
DOIs
StatePublished - 29 Jan 2007
Externally publishedYes

Keywords

  • Dithiocarbazate
  • Fluorenone
  • Schiff base
  • π-π stacking

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