Bottom up synthesis for homo- and heterometallic 2,3-pyridinedicarboxylate coordination compounds

The mononuclear copper complexes (Hdapt)[Cu(Hpydc)(pydc)(H2O)center dot H2O (1) and (H(2)aba)[Cu (pydc)(2)(Haba)](2)center dot 9H(2)O (2) {where dapt = 2,4-diamino-6-phenyl-1,3,5-triazine, aba = 3-aminobenzylamine and H(2)pydc = 2,3-pyridinedicarboxylic acid} were synthesized and fully characterized. Of these, compound 1 is a very good building block for the bottom up synthesis of the dicopper(II) derivative (Hdapt)(4)[Cu-2(pydc)(4)]center dot 10H(2)O (3), the heterometallic 2D coordination polymer {Zn(H2O)(4)Cu(pydc)(2)]center dot 3H(2)O)}(n) (4) and the 3D metal-organic framework {[Gd(H2O)(5)Cu-1.5(pydc)(3)]center dot 5H(2)O}(n) (5). The structures of 1-3 reveal the formation of distinct 2D (in 1 and 3) and 3D (in 2) H-bonded networks driven by strong hydrogen bonds between the Cu(pydc)2-containing anions and amine cations. The underlying H-bonded (in 1-3) and metal-organic (in 4 and 5) networks were classified from a topological viewpoint; disclosing the following topologies: a SP 1-periodic net (4,4)(0,2) in 1, a topologically unique net in 2, a 3,6L17 layer in 3, a 3,4L13 layer in 4 and an alb-3,6-P42/mnm framework in 5. The thermal properties of 1-5 as well as the decomposition of 4 and 5 toward the synthesis of nano-dimensional mixed metal oxides were investigated. (C) 2015 Elsevier Ltd. All rights reserved.