Spectroscopic and electronic properties of mixed ligand aminoacidatocopper(II) complexes: Molecular structure of [Cu(4,7-dimethyl-1,10-phenanthroline)(L-phenylalaninato)](ClO4)

Chan Cheng Su*, Tsai Yun Tai, Shu-Pao Wu, Sue Lein Wang, Fen Lin Liao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Mixed-ligand aminoacidatocopper(II) complexes of the types, [Cu(L-phe)(NN)](ClO4)·nH2O [L-phe=L-phenylalaninato; NN=2,2′-bipyridine (n=2), 1,10-phenanthroline (n=2), and 4,7-dimethyl-1,10-phenanthroline (dmphen, n=0)], [Cu(gly)(NN)](ClO4)·nH2O [gly=glycinato; NN=2,2′-bipyridine (n=1), 1,10-phenanthroline (n=0), neocuproine (n=0), and ethylenediamine (n=2)], and [Cu(L-ala)(NN)](ClO4)·nH2O [L-ala=L-alaninato; NN=2,2′-bipyridine (n=0), 1,10-phenanthroline (n=1), and neocuproine (n=2)], have been synthesized and characterized by elemental analyses, and IR, UV-Vis, CD, and EPR spectroscopic measurements. The molecular structure of [Cu(L-phe)(dmphen)](ClO4) (1) has been determined by three-dimensional X-ray diffraction data. Complex 1 consists of discrete perchlorate anions and square planar cationic copper complexes. Based on the spectroscopic data, the structures of the complexes are either square pyramidal or square planar in solid state, whereas they are square pyramidal in solution. The sequence of d orbitals was assigned as dxy≫dz2>dx2-y 2>dyz>dxz for the solution species as deduced from the Gaussian resolved electronic absorption and CD spectroscopic data. Both aminoacidato and heterocyclic diimine ligands do not participate in π-interactions in these complexes.

Original languageEnglish
Pages (from-to)2361-2368
Number of pages8
JournalPolyhedron
Volume18
Issue number18
DOIs
StatePublished - 30 Jul 1999

Keywords

  • Aminoacidatodiiminecopper(II) complexes
  • Circular dichroism spectra
  • EPR spectra
  • Gaussian analysis
  • X-ray structure* d-d spectra

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