Syntheses, structures, and photoluminescence of three novel coordination polymers constructed from dimeric d10 metal units

Three novel coordination polymers containing dimeric d(10) 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)]center dot 4H(2)O}(n) (3), have been synthesized by hydrothermal reaction of pyridine-2,3-dicarboxylic acid (2,3-Pydc) with d(10) 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 (lambda(ex) = 363 nm).