Construction of Six Coordination Polymers Based on a 5,5′-(1,2-Ethynyl)bis-1,3-benzenedicarboxylic Ligand: Synthesis, Structure, Gas Sorption, and Magnetic Properties

Six novel coordination polymers based on a multifunctional
ligand,
5,5′-(1,2-ethynyl)­bis-1,3-benzenedicarboxylic (H4EBDC), namely, |(C3H7NO)2(H2O)7­(C2H5OH)3|[Zn2(C18H6O8)­(C10H8N2)2] (1),
|(C3H7NO)3(H2O)30­(CH3CN)2|[Zn6(C18H6O8)3­(C6H12N2O2)2] (2),
|(C3H7NO)2­(H2O)2(H3O)2­|[Cd3(C18H6O8)2] (3), |(C3H7NO)|­[Mn­(C18H8O8)­(C3H7NO)2] (4), |(C3H7NO)2­(H2O)­(C2H7N)3­|[Mn6(C18H7O8)4­(H2O)8] (5), and [Mn2(C18H6O8)­(C3H7NO)2] (6), have been constructed under solvothermal
conditions and structurally characterized by single-crystal X-ray
diffraction. In these compounds, the ligand, H4EBDC, exhibits
different coordination modes and conformations, constructing various
architectures by bridging a variety of metal ions or polynuclear clusters.
Compound 1 forms a three-dimensional (3D) FSC network constructed from two-dimensional (2D) layer motifs joined
by EBDC4– and 4,4′-bipyridine bridges. Compound 2 possesses an NbO topology by linking Zn2(CO2)4 units with the ligand, coordinated
amine molecules fill the pores, while compound 3 exhibits
a 3D FLU network with Cd2+ as the cation and
features an infinite framework built from tricadmium clusters. Compound 4 is based on PtS net, constructed of 4-connected
rectangular H4EBDC units with tetrahedral monometallic
Mn­(CO2)4 nodes. Compound 5 is composed
of 2D layers with (3,6)-connected KGD topology, and compound 6 consists of a 3D PtS-X network, built by bridging
a metal chain with the ligand. The structures of these compounds have
been discussed together with their corresponding properties, such
as gas storage, separation, and magnetic properties.