Five Novel Coordination Polymers Based on a C-Centered Triangular Flexible Ligand

Five new complexes of the wholly deprotonated C-centered triangular flexible ligand tris­(p-carboxyphenyl)­methane (TCOPM), namely, {[Zn4O­(TCOPM)2(H2O)2]·8H2O·3DMF}n (1), {[Mn3(TCOPM)2(H2O)2]}n (2), {[Cd3(TCOPM)2(DMF)­(H2O)3]·3H2O}n (3), {[Cd3(TCOPM)2(4,4′-bipy)]·2H2O·2DMF}n (4), and {[Cd4(TCOPM)2(dpyb)3(NO2)2·(H2O)2]·5H2O}n (5), are synthesized in the presence or absence of auxiliary 4,4′-bipyridine (4,4′-bipy) and 1,4-di­(pyridine-4-yl)­benzene (dpyb) ligands by solvothermal reaction. The complexes were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and X-ray single-crystal diffraction. Compound 1 exhibits an unusual three-dimensional (3D) framework containing a one-dimensional (1D) channel based on a Zn4O cluster, with (4·82)­(42·6)­(43· 6· 810·10) net topology. 2 displays a 3D network structure with tfz-d topology type. Compound 3 reveals double-layered two-dimensional (2D) framework. Compound 4 possesses a 3D structure with a (3,3,10)-connected net. 5 is a 3D structure with (623·85)­(63)2(65·8) topology. The photochemical properties and emission decay lifetimes were determined in the solid state at room temperature. The luminescent properties of compounds 1 and 3–5 are discussed in detail. The N2 gas adsorption of compound 1 exhibits type-I sorption behavior.