Synthesis, Structural Characterization and Photophysical Properties of Bis(4'-chloro-2,2':6',2''- terpyridyl)nickel(II)chloride dihydrate

Abstract

Abstract Ni(II) complex viz., bis(4'-chloro-2,2':6',2''-terpyridyl)nickel(II)chloride dihydrate, Ni(Cltpy)2(Cl2).2H2O was prepared under mild conditions by conventional method. A tridentate ligand 4'-chloro-2,2':6',2''-terpyridine (Cltpy) was employed during the synthesis. The octahedral geometry of the complex was revealed by subjecting it to single crystal X-ray diffraction (SCXRD) studies. The synthesized complex, characterized primarily by fourier transform-infrared (FT-IR) and elemental analysis, was investigated with the aim of determining their thermal behaviour using thermogravimetry-differential thermal analysis (TG-DTA) and photophysical properties through photoluminescence (PL) and diffuse reflectance (DR) spectrum. Recording of DR spectrum in the range 200-1100 nm showed a prominent peak at 630 nm and the band gap energy of 2.38 eV was resulted in accordance with Kubelka–Munk (K-M) theory. The PL spectra of the title compound displayed the emission of blue green light. The commission internationale de l’eclairage (CIE) coordinates (0.2641, 0.3722) were obtained from its CIE graph. Scanning electron microscope (SEM) analysis was carried out to find its surface morphology.