Syntheses, Structures, and Photoluminescence of Three Novel Coordination Polymers Constructed from Dimeric d¹⁰ Metal Units

Three novel coordination polymers containing dimeric d10 metal units, [Cd(2,3-Pydc)(H2O)2]n (1), [Zn(2,3-Pydc)(H2O)2]n (2), and {[La2Zn3(2,3-Pydc)6(H2O)6]·4H2O}n (3), have been synthesized by hydrothermal reaction of pyridine-2,3-dicarboxylic acid (2,3-Pydc) with d10 metal oxides at a suitable temperature. Complex 1 is a one-dimensional (1D) ladder coordination polymer containing a dimeric Cd2O8N2 unit. Complex 2 forms a two-dimensional (2D) layer built from a unique Zn2O8N2 unit, in which each pair of Zn(II) ions are bridged by two water molecules. Complex 3 is a 2D heterometallic framework by 1D chain linked by Zn(2,3-Pydc) units, where the 1D chain is constructed via dimeric La2O16 units. The photoluminescent studies show that complex 2 illustrates an emission at 417 nm (λex = 363 nm).