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 (H 2 O) 3 ] ∞ ( 1 ) (2,6-pda = pyridine-2,6-dicarboxylate), a two-dimensional (2D) sheet network [Pb(2,6-pda)] ∞ ( 2 ), a 2D hybrid rhombic grid coordination polymer [Cd(phen)(2,5-pda)] ∞ ( 3 ), a 1D hybrid zigzag chain {[Zn(phen)(2,5-pda)]·H 2 O} ∞ ( 4 ), and a tetranuclear metallamacrocyclic complex {[Zn(2,5-pda)(H 2 O) 2 ][Zn(2,5-pda)(H 2 O) 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 .