Electronic Structure and Spectral Study of Some Five Coordinate Complexes of Copper (II)

Abstract

1-phenylazo-2-nephthol has been synthesized and used for complexation with Cu(II) metal ion along with pyridine, α-picoline, β- picoline, γ-picoline and water as secondary ligands. On the basis of elemental analysis and molar conductivity complexes were formulated as CuL2X [Where L is the prime ligand i.e 1-phenyl-azo-2-nephthol and X is the secondary ligand i.e. pyridine, α-picoline, β-picoline, and H2O.] The magnetic moment of these complexes (1.80 - 1.83 BM) indicates that these complexes are magnetically dilute. The appearance of 3 bands in the electronic spectra of complexes rules out the trigonal bipyramidal (D3h) symmetry arround Cu(II) ion in these complexes rather the electronic spectra favours square pyramidal (C4V) symmetry of these five coordinate complexes. The highest value of 10Dq clearly indicates the greater coordinating ability of α-picoline than pyridine, β-picoline and γ-picoline.

Structural and biological studies of mononuclear metal (II) complexes containing hetero ligand based on 3‐acetylpyridine thiosemicarbazone

“…Because of the low intensity of the 2 B 1 g → 2 A 1 g transition, it is not observed. The values are in good agreement with the values reported for Cu (II) complexes of square‐pyramidal geometry 69,70 . The experimental magnetic moment value of the copper (II) complex is 2.20, which falls within the square pyramidal environment [2.…”

“…The values are in good agreement with the values reported for Cu (II) complexes of square-pyramidal geometry. 69,70 The experimental magnetic moment value of the copper (II) complex is 2.20, which falls within the square pyramidal environment [2. 11-2.21] BM range, and is consistent with data reported by other researchers.…”

Spectroscopic Elucidation of Some Complexes of Vanillin Semicarbazone

“…It confirms the coordination of N of azomethine moiety of the ligand [28][29][30][31] . A tacit support for the above propositions is brought out more clearly from the far FTIR spectra of the complexes which display new weak bands appearing at 495-500 cm -1 and 420-725 cm -1 due to n M-N & n M-O stretching vibration respectively [32][33] .…”