Abstract

SYNTHESIS AND SPECTROSCOPIC ANALYSIS OF SCHIFF BASES OF CU(II) COMPLEX AND ITS APPLICATION

*Praveen Kumar Singh, Birendra Kumar, Dayanand Prasad, Sunny Kumar and Shivadhar Sharma

Abstract

Copper(II)–Schiff base complexes have attracted extensive interest due to their structural, electronic, magnetic and luminescence properties. Schiff base ligands are regarded as an important class of organic compounds on account of the fact that their complexation ability with transition metal ions. The title novel monomeric Schiff base Cu(II) complex, [Cu(HL)2], 1[H2L=2–((E)–(2– hydroxypropylimino)methyl)–4– nitrophenol] has been synthesized and characterized by elemental analysis, UV and IR spectroscopy, X-ray diffraction and photoluminescence study. The Cu(II) atom is located on a centre of inversion and is coordinated by two imine Natoms, two phenoxy O atoms in a mutual trans disposition and two hydroxy O atoms in axial positions, forming an elongated octahedral geometry. In the crystal, intermolecular O—H- - -O hydrogen bonds link the molecules to form a one- dimensional chain structure and π– π contacts also connect the molecules to form a three-dimensional structure. While the Schiff base ligand and its Cu(II) complex are excited at λex= 349 nm in UV region, the Schiff base ligand shows a blue emission band at λmax = 480 nm whereas its Cu(II) complex shows a strong green emission band at λmax = 520 nm in the solid state at room temperature. The luminescent properties showed that the Schiff base ligand and its Cu(II) complex can be used as novel potential candidates for applications in textile such as UVprotection, antimicrobial, laundry and functional bleaching treatments.

Keywords: Schiff base ligands, Photoluminescence, monomeric copper(II) complex; photoluminescence, phenolate, crystal structure, hydrogen bonding.