Ligand L1 was prepared by condensing tetrahydro furfuryl amine with benzimidazloe aldehyde to form Schiff base followed by

reduction with Sodium borohydride. The copper(II) complex(1) was synthesized by the reaction between copper(II) chloride and L1 in equimolar quantities using methanol as solvent. The present complex was obtained in good yield and characterized by using elemental analysis, UV–Vis, ESI-MS and EPR spectral techniques. The analytical data obtained for the new complex agree well with the proposed molecular formula. The synthetic scheme for the present complex is shown in Scheme 1. The ESI mass spectrum of [Cu(L1)(Cl)](Cl) displayed the molecular ion peak at m/z 367.27 which is reliable with the proposed molecular formula of the copper(II) complex. The electronic spectrum of the present complex shows two bands shows two bands at 270.8 and 277.4 nm, which can be attributed to intra ligand transitions of the ligand. CCI 779 Broad metal to ligand charge transfer (MLCT) transition has been observed at 364.6 nm. Complex 1 also exhibits its ligand field transition as broad band at 682 nm. Three d–d transitions are possible for copper(II) complexes. They are dxz,dyz−dx2−y2,dz2−dx2−y2 and dxy−dx2−y2dxy−dx2−y2. However, only a single broad band is observed for the copper(II) complex. This indicates the total sum of all the above transitions. The broadness associated with the d–d bands is generally

taken as an indication of the geometrical distortion of the complex from perfect planar symmetry. IR spectra provide the valuable information about Metabolism inhibitor the nature of the binding mode and functional group attached

to the metal ion. In complex 1, the IR peak observed at 3248 cm−1 was assigned as N–H stretching frequency. Medium intensity bands appeared at 2954 and 1620 cm−1 was attributed to C–H and C N stretching vibrations respectively. In the IR spectra of the present complex no band due to vibration of NH2 could be observed. This indicates the condensation of the free aminophylline amine group in the formation of ligand L1. A medium intensity band appeared at 1452 cm−1 have been assigned to C C stretching vibrations. The EPR spectra of complex 1 taken at room temperature show an axial signal from a static copper(II) centre with dx2−y2dx2−y2 as the ground state. The g value of the complex is 2.07. The broad epr spectrum and its g value confirms the formation of paramagnetic copper(II) complex. The redox behaviour of copper complexes is studied with the help of cyclic voltammetry. Cyclic voltammogram of the copper complex was recorded in DMSO (Dimethyl sulphoxide) solution at 300 K using tetra butyl ammonium perchlorate (TBAP) as supporting electrolyte. The cyclic voltammogram of complex 1 in DMSO solution shows a quasi reversible peak at 0.51 V with large ΔEp values of 240 mV respectively at a scan rate of 100 mVs−1.