Solvent-Induced Synthesis of Zinc(II) and Manganese(II) Coordination Polymers with a Semirigid Tetracarboxylic Acid

By using a semirigid quadricarboxylate ligand 5,5'-(biphenyl-4,4'-diyIbis (methylene))bis(oxy)diisophthalic acid (H4L), four novel coordination polymers were obtained solvothermally and characterized by single-crystal X-ray diffraction, thermogravimetric, photoluminescent and gas adsorption studies. Compound [Zn-2(L)] center dot CH3CN, 1, is a three-dimensional (3D) framework built from one-dimensional (ID) rod-shaped Zn-O-C secondary building units (SBUS) that are linked together by the 4-connecting L ligands to give rod packing of pcu type and elliptical channels of 7.7 x 8.4 angstrom(2). Compound [Zn-4(L)(2)(H2O)(4)] center dot 5H(2)O, 2, possesses a 3D open framework with a doubly interpenetrated sra net built from 4-connecting Zn-2(OOC)(4) unit and L ligand. Compound [Mn-2(L)(H2O)(2)] center dot 2H(2)O, 3, is built from trigonal-bipyramidal binuclear Mn-2(OOC)(3) units and octadentate L ligands, forming a binodal 5,5-connected 4(3).6(6).8 net. Compound (Mn(H2L)(DMA)(H2O)] center dot (DMA)(H2O), 4, is a two-dimensional (2D) layered structure made of 4-connecting mononuclear Mn atoms and half-deprotonated L ligands. N-2 gas adsorption measurements at 77 K showed that compounds 1, 2, and 4 possess permanent porosities.