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Nickel(II) complex viz. bis(4′-chloro-2,2′:6′,2″-terpyridyl)nickel(II)chloride dihydrate, Ni(Cltpy)2Cl2·2H2O where Cltpy is a tridentate ligand was synthesized under mild conditions by conventional method. The octahedral geometry of nickel(II) complex was revealed by single crystal X-ray diffraction (SCXRD) studies. The synthesized Ni(II) complex was characterized by Fourier transform-infrared (FT-IR), elemental analysis, scanning electron microscope (SEM), thermal analysis (TG-DTA), photoluminescence (PL) and diffuse reflectance (DR) spectra. A prominent peak at 630 nm was recorded in the DR spectrum and the band gap energy of 2.38 eV was resulted in accordance with Kubelka-Munk (K-M) theory. The photoluminescent spectra of the synthesized nickel(II) complex 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.
Thippeswamy et al. (Wed,) studied this question.