Synthesis, crystal structures, spectral studies and reactivity of square planar copper(II) complexes containing Schiff base ligand

Poulami Pattanayak*, Jahar Lal Pratihar, Debprasad Patra, Chia Her Lin, Paula Brandão, Dasarath Mal, Vitor Felix

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The reactions of HL1 [2-((2-(benzylthio)phenylimino)methyl) phenol] and HL2 [3-((2-(benzylthio)phenylimino)methyl)-2-hydroxy-5- methylbenzaldehyde] separately with Cu(OAc)2·H2O afforded new Cu(II) complexes [Cu(L1)(OAc)] (1) and [Cu(L 2)2] (2), respectively. These are characterized by microanalytical data and spectroscopic studies. UV-vis spectra of the complexes show intense low-energy transitions ∼ 420 nm which are ligand to metal charge transfer (LMCT) transitions. The single-crystal X-ray structures were determined for 1 and 2. Reactions of [Cu(L1)(OAc)] (1) with, SCN - and show the replacement of weakly coordinated acetate yielding [Cu(L1)(N3)], [Cu(L1)(SCN)] and [Cu(L 1)(NO2)], respectively. Unequivocal characterization of the substituted products has been done by single-crystal X-ray study of [Cu(L1)(N3)]. HL2 and its Cu(II) complex exhibited low-intensity emission bands at ∼575 nm upon excitation at 375 nm and at 420 nm, respectively. Redox properties of the complexes were determined electrochemically. Density functional theory (DFT) computations have been carried out to explain the spectroscopic and redox properties of the complexes.

Original languageEnglish
Pages (from-to)568-579
Number of pages12
JournalJournal of Coordination Chemistry
Volume66
Issue number4
DOIs
Publication statusPublished - 2013 Feb 1
Externally publishedYes

Keywords

  • Copper II
  • Crystal structure
  • DFT
  • Ligand substitution
  • Redox

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry

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