Lead(II) coordination polymers based on rigid-flexible 3,5-bis-oxyacetate-benzoic acid: Structural transition driven by temperature control

Three Pb(II) complexes {[Pb-3(BOABA)(2)(H2O)]center dot H2O}(n) (1), {[Pb-4(BOABA)(2)(mu(4)-O)(H2O)(2)]center dot H2O}(n) (2), and [Pb-3(BOABA)(2)(H2O)](n) (3) (H(3)BOABA=3,5-bis-oxyacetate-benzoic acid) were obtained under the same reaction systems with different temperatures. Complexes 1 and 2 are two dimensional (2D) networks based on Pb-BOABA chains and Pb-4(mu 4-O)(COO)(6) SBUs, respectively. Complex 3 presents an interesting three dimensional (3D) framework, was obtained by increasing the reaction temperature. Structural transition of the crystallization products is largely dependent on the reaction temperature. Moreover, the fluorescence properties of complexes 1-3 have been investigated.