Growth and characterization of heterobimetallic copper-sodium complex of cyanuric acid: A novel photoluminescent material

Abstract

Deep blue coloured novel crystals of copper-sodium bimetallic complex of cyanuric acid are obtained by single gel diffusion method at room temperature. This is the first report on the exquisite heterobimetallic crystal structure of cyanuric acid complex. The metal coordination is confirmed by FTIR analysis. TGA/DTA provides an insight into the thermal properties of the crystal. The thermal decomposition starts at 197.76 °C up to which the crystal is stable. Both FTIR analysis and TGA/DTA confirm the presence of sodium atom in the grown crystal. The crystal structure with two metals, coordinated to ligand is elucidated by single crystal X-Ray diffraction. The optical behavior is studied and optical properties like band gap and refractive index obtained from UV visible spectroscopy are 3.53 eV and 1.25 respectively. The photoluminescent study reveals the emission of radiation in the violet region at 416 nm. The dielectric studies have been employed to examine the dielectric behavior of this bimetallic complex in terms of variation of dielectric constant, dielectric loss, ac conductivity and impedance with frequency of alternating electric field. Using the single crystal XRD data, the polarisability α is calculated as 1.4 × 10−22 cm3 from penn analysis and Clausius Mossotti relation. The calculated value of polarisability from band gap is found to be 0.8 × 10−22 cm3. The important optical property possessed by this bimetallic complex is the photoluminescent emission enabling it to be used in luminescent device applications.