A study on copper(II)-Schiff base-azide coordination complexes: Synthesis, X-ray structure and luminescence properties of [Cu(L)(N3)]X (L = Schiff bases; X = ClO4, PF6) |
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Authors: | Sk Hafijur Rahaman Hoong-Kun Fun Barindra Kumar Ghosh |
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Institution: | aDepartment of Chemistry, The University of Burdwan, Golapbag, Rajbati, Burdwan 713104, India bX-ray Crystallography Unit, School of Physics, University Sains Malaysia, 11800 USM, Penang, Malaysia |
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Abstract: | Two Schiff bases N,N′-(bis(pyridin-2-yl)benzylidene)propane-1,3-diamine (pbpd) and N,N′-(bis(pyridin-2-yl)formylidene)butane-1,4-diamine (pfbd) have been prepared and used to synthesize copper(II) complexes. Four complexes of the type Cu(L)(N3)]X (1–4) L = pbpd; X = ClO4 (1); L = pbpd; X = PF6 (2); L = pfbd; X = ClO4 (3); L = pfbd; X = PF6 (4)] have been synthesized and characterized on the basis of microanalytical, spectroscopic, magnetic, electrochemical, luminescence and other physicochemical properties. Two representative complexes of the series, 2 and 3, have been characterized by single crystal X-ray diffraction measurements which reveal that in each complex the copper(II) ion assumes a distorted trigonal bipyramidal environment through coordination of the metal centre by two pyridine N atoms and two imine N atoms of the Schiff base with the fifth position occupied by a N atom of a terminal . They display intraligand 1(π–π*) fluorescence at room temperature and intraligand 3(π–π*) phosphorescence in glassy solutions (MeOH at 77 K). A band (492 nm) observed for the complexes in their solid-state emission spectra is an excimeric emission arising due to an aromatic π–π interaction. Electrochemical electron transfer study reveals CuII–CuI reduction in methanolic solutions. |
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Keywords: | Copper (II) azide Schiff bases X-ray structure Luminescence spectra |
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