ABSTRACT
Six solid complexes(TbL3 x 2H2O, TbL2 (phen) x H2O, TbL2 (TPPO), EuL3 x 2H2O, EuL2 (phen) x 2H2O and EuL2 (TPPO) x 2H2O) have been synthesized based on the pyrazole ligand(HL)(phen = 1,10-phenanthroline, TPPO = Tri-phenylphosphine oxide, HL=1-(5-(2-hydroxyphenyl)-3-methyl-4,5-dihydropyrazol-1-yl) ethanone). These complexes were characterized by elemental analysis, IR spectra, and fluorescence spectra. The IR spectra indicated that all complexes exhibited the characteristic peaks of asymmetric stretching vibration v (C=O) and symmetric stretching vibration v (C=N) peaks. The C=O stretching band at 1,644 cm(-1) of HL molecule shifted to lower band in the complexes. The O-H band at 3,072 of the HL ligand is also shifted to lower band. All these shifts indicated that carbonyl group, O-H and C=N take part in coordinating with the rare-earth ion in the form of bridging tridentate. The excitation and emission spectra of the six complexes were determined at room temperature and the results show that EuL2 (Phen) x 2H2O and TbL2 (Phen) X 2H2O display the strongest relative fluorescence intensity with the excited bands at 310 and 320 nm, respectively. Meanwhile, the emission intensities of Eu3+ and Tb3+ complexes were greatly sensitized by phen.
ABSTRACT
In the title complex, [Ni(2)(C(13)H(11)F(2)N(6)O)(2)(C(2)H(3)O(2))(2)]·0.5CH(3)OH, there are two half-molecules in the asymmetric unit. The two centrosymmetrically related Ni(II) atoms, each attached to an acetate ligand, are linked by two fluconazole ligands. Each Ni(II) atom is six-coordinated in a distorted octa-hedral geometry by two N atoms of the triazole groups and two bridging O atoms from two different fluconazole ligands and two O atoms from a chelating acetate ligand. In the crystal structure, the half-occupied methanol solvent mol-ecule is linked to a triazole group via an O-Hâ¯N hydrogen bond.
ABSTRACT
In the title complex, [Cu(C(5)H(5)N(2)O(2))(C(14)H(18)N(3)O)(H(2)O)]·1.33H(2)O, the Cu(II) ion is coordinated in a slightly distorted square-pyramidal environment. The basal plane is formed by two N atoms from a 2-(5-ethyl-2-pyridyl-κN)-4-isopropyl-4-methyl-5-oxo-4,5-dihydroxy-imidazol-1-ide ligand and by one O atom and one N atom from a 5-methyl-1H-pyrazole-3-carboxyl-ate ligand. The apical position is occupied by a water mol-ecule. In the crystal structure, O-Hâ¯O, O-Hâ¯N and N-Hâ¯O hydrogen bonds lead to a three-dimensional supra-molecular network.