Structural Diversity and Catalytic Properties of Coordination Polymers with Functionalized Naphthalene Dicarboxylate Linkers

Ten novel transition-metal-based coordination polymers were hydrothermally synthesized using metal salts (M = Co(II), Mn(II), Ni(II), and Zn(II)) with the primary ligand 4-aminonaphthalene-2,6-dicarboxylic acid (H(2)anda) as well as auxiliary ligands (phen: 1,10-phenanthroline; 2,2 '-bipy: 2,2 '-bipyridine; 4,4 '-bipy: 4,4 '-bipyridine; bpa: bis(4-pyridyl)amine, dpe: 1,2-di(4-pyridyl)ethylene or py: pyridine). The successful synthesis provided four two-dimensional (2D) and six three-dimensional (3D) coordination polymers, formulated as [Co(mu(5)-anda)(H2O)](n) (<bold>1</bold>), [Co-2(mu-anda)(mu(4)-anda)(phen)(2)](n) (<bold>2</bold>), [M(mu(4)-anda)(phen)](n) (M = Co (<bold>3</bold>), Mn (<bold>4</bold>)), [Co-3(mu(4)-anda)(3)(2,2 '-bipy)(2)](n) (<bold>5</bold>), [Ni-2(mu-anda)(mu(4)-anda)(mu-4,4 '-bipy)(2)](n) (<bold>6</bold>), [Co(mu-anda)(mu-bpa)](n)<middle dot>nH(2)O (<bold>7</bold>), [Mn-6(mu(4)-anda)(6)(mu-dpe)(3)](n)<middle dot>22nH(2)O (<bold>8</bold>), and [M-6(mu-anda)(2)(mu(4)-anda)(mu(5)-anda)(mu(3)-OH)(4)(py)(2)](n)<middle dot>2nH(2)O (M = Co (<bold>9</bold>), Zn (<bold>10</bold>)). A thorough investigation was conducted using conventional methods to look at the topological types and catalytic activity of the synthesized coordination polymers. Notably, under ideal conditions, coordination polymer <bold>7</bold> produced good conversion in the Henry and Knoevenagel condensation of benzaldehydes, demonstrating stability, high efficacy, and recyclability as a heterogeneous catalyst.