Synthesis,Structure and Fluorescence of a Copper(II) Complex [Cu_2(bipy)_2(Hpht)_2Cl](Hpht)(bipy=2,2'-Bipyridine,H_2pht=o-Phthalic Acid)

1 INTRODUCTION o-Phthalic acid (H2pht) is a versatile ligand for co-ordinating to metal ions in various modes, such asmonodentate bonding through a carboxylic O atom1],bidentate fashion via two carboxylic O atoms2] andtriple coordination through its three carboxylic Oatoms3], and bridging mode with two or four Oatoms of its carboxylate groups4]. The coordinationproperties thus allow for the preparation of complex-es with a large variety of architectures, forming iso-lated mono-, di…

Synthesis, Structure and Fluorescence of a Copper(II) Complex [Cu2(bipy)2(Hpht)2Cl](Hpht) (bipy = 2,2'-Bipyridine, H2pht = o-Phthalic Acid)

The title complex Cu2(bipy)2(Hpht)2Cl](Hpht) (bipy = 2,2’-bipyridine, H2pht = o-phthalic acid) has been synthesized in the NaOH aqueous solution of CuCl2, Gd(NO3)3, bipy and H2pht, and its crystal structure was determined by single-crystal X-ray diffraction method. It crystallizes in triclinic, space group P, C44H31ClCu2N4O12, Mr = 970.26, a = 8.175(2), b = 16.254(4), c = 16.946(4) (A), α = 62.966(6), β = 84.833(8), γ = 84.348(8)°, V = 1993.4(8) (A)3, Z = 2, Dc = 1.616 g/cm3, F(000) = 988 and μ = 1.207 mm-1. The final R = 0.0429 and wR = 0.0843 for 5682 observed reflections with I > 2σ(I). Each copper(II) atom displays a distorted square-pyramidal geometry with two nitrogen atoms of one chelate 2,2’-bipy molecule, two oxygen atoms from two different bridging carboxylate groups of Hphtˉand one bridging chloride atom occupying the apical position. The two copper(II) atoms are connected by a μ2-Cl atom and two bridging Hpht- ligands in a syn-syn coordination mode to form an isolated dinuclear unit. The molecular structure is extended to a one-dimensional wavy chain through hydrogen bonds. The title complex exhibits blue fluorescent emission at 443 nm (λex = 372 nm) in the solid state at room temperature.