Two Lead(II)-Organic Coordination Polymers Based on N-Acetic-5-oxygen-nicotinic Acid: Syntheses, Structures and Fluorescence Properties

Two new lead coordination polymers, namely, [Pb-4(mu(3)-O)(2)L-2](n) (1), [Pb-3(mu(4)-O)(2)L](n) (2) (H2L=N-acetic-5-oxygen-nicotinic acid) have been prepared by the reaction of Pb(NO3)(2) with H2L and characterized by elemental analysis, IR and single crystal X-ray diffraction. Polymer 1 crystallizes in the monoclinic C2/c space group, and features [Pb-4(mu(3)-O)(2)](n) rigid inorganic chains, which are further linked by L2- ligands to form a 3D framework. Polymer 2 crystallizes in the orthorhombic P2(1)2(1)2(1) space group, and displays a 3D framework with [Pb-3(mu(4)-O-)2](n) inorganic chains. The thermodynamic stability and fluorescence properties of 2 were investigated.