From dicarboxylic acid to tetranuclear metallamacrocyclic complex and 1D and 2D polymers

A series of metal carboxylate complexes have been synthesized by treating 2,6-dicarboxamido-(2-pyridyl)-pyridine (H(2)dcapp), pyridine-2,5-dicarboxylate acid (2,5-H(2)pda), and phenanthroline (phen) with metal salts under hydrothermal conditions. Carboxylate groups as building blocks are used to link adjacent metal centers forming a one-dimensional (1D) coordination polymeric chain [Mn-2(2,6-pda)(2)(H2O)(3)](infinity) (1) (2,6-pda = pyridine-2,6-dicarboxylate), a two-dimensional (2D) sheet network [Pb(2,6-pda)](infinity) (2), a 2D hybrid rhombic grid coordination polymer [Cd(phen)(2,5-pda)]- (3), a 1D hybrid zigzag chain {[Zn(phen)(2,5-pda)] center dot H2O}(infinity) (4), and a tetranuclear metallamacrocyclic complex [Zn(2,5-pda)(H2O)(2)][Zn(2,5-pda)(H2O)(3)]}(2) (5). Their thermal properties were studied through TG-DT analyses. The magnetic measurement of polymer 1 reveals that typical antiferromagnetic exchange exists between Mn centers with J = -0.215 cm(-1).