Synthesis, crystal structure, spectroscopic, fluorescent, thermal properties and EPR spectra of doped Cu2+ ions in [Cd(sac) 2(H2O)2(meim)2] single crystal

FİDAN M., SEMERCİ F., ŞAHİN E., YEŞİLEL O. Z., Tapramaz R., ŞAHİN Y.

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, cilt.110, ss.437-442, 2013 (SCI-Expanded, Scopus)

Özet

The crystal structures of the six-coordinate complexes [Cd(sac) 2(H2O)2(meim)2] (complex 1) formed by reaction of 4-methylimidazole(meim) with [Cd(sac)2(H 2O)4]2H2O (saccharinate = sac), was synthesized and characterized by elemental analysis, infrared (IR) and electron paramagnetic resonance (EPR) spectroscopy, thermal analysis and X-ray single crystal diffraction. X-ray diffraction analysis revealed that complex 1 crystallized in the monoclinic crystal system with space group P21/c. The Cd(II) center was six-coordinated with four nitrogen atoms from two sac and two 4-meim ligands, two oxygen atoms from two aqua ligands. Spectral and thermal analysis data for complex 1 was in agreement with the crystal structures. In addition complex 1 displayed blue fluorescent emission in the solid state at room temperature. Single crystal EPR spectra at room temperature are resolved and have exhibited that two different Cu2+ complexes were located in different chemical environments which contained two magnetically nonequivalent Cu2+ sites. In low temperature EPR spectra down to 110 °C did show no considerable change. At higher temperatures, however, both thermo gravimetric analyses (TGA) and EPR spectra showed detectable changes around 140 °C; the causes and the mechanisms of changes are discussed. © 2013 Elsevier B.V. All rights reserved.