Synthesis, Crystal Structure of 3-Methylpyrazole-5-carboxylate Based Zinc(II) Complex and its Fluorescent Property

A transition metal complex Zn(mpc)(2)(H2O)(2) (Hmpc=3-methylpyrazole-5-Carboxylic acid) has been synthesized by the reaction Hmpc with Zn(NO3)(2)center dot 6H(2)O using hydrothermal method, which was characterized by IR spectra, elemental analysis and single-crystal X-ray structure analysis. The structure reveals that the complex crystallizes in the trigonal space group R (3) over barc with the Zn-II atom on a threefold axis, composed of one Zn-II atom, two independent mpc(-) ligands and two coordinated water. Hydrogen bonds link the molecules into a three-dimensional supramolecular architecture. Fluorescent band at 471 mm upon photoexcitation at 280 nm and has a bathochromic shift of the emission energy compared with the free ligand, possibly due to metal-to-ligand charge transfer (MLCT). CCDC: 682402.