A novel cadmium(II) coordination polymer with a four-connected (4,4)-net based on a trinuclear cadmium(II) node.

In the title cadmium(II) coordination polymer, poly[tri-mu(4)-adipato-bis(2-phenyl-1H-1,3,7,8-tetraazacyclopenta[l]phenanthrene-kappa(2)N(7),N(8))tricadmium(II)], [Cd(3)(C(6)H(8)O(4))(3)(C(19)H(12)N(4))(2)](n), one of the Cd atoms is in a distorted pentagonal bipyramidal coordination environment, surrounded by five O atoms from three adipate (adip) ligands and two N atoms from one 2-phenyl-1H-1,3,7,8-tetraazacyclopenta[l]phenanthrene (L) ligand. A second Cd atom occupies an inversion center and is coordinated by six O atoms from six adip ligands in a distorted octahedral geometry. The carboxylate ends of the adip ligands link Cd(II) atoms to form unique trinuclear Cd(II) clusters, which are further bridged by the adip linkers to produce a two-dimensional layer structure. Topologically, each trinuclear Cd(II) cluster is connected to four others through six adip ligands, thus resulting in a unique two-dimensional four-connected framework of (4,4)-topology. This work may help the development of the coordination chemistry of 1,10-phenanthroline derivatives.