A series of coordination polymers based on a new 2′,5′-dimethyl-1,1′:4′,1"-terphenyl-3,3"-dicarboxylic acid ligand: structures, luminescence, and magnetic properties

Five new coordination polymers, namely, [Mn(L)(BIP)(2)]center dot H2O (1), [Cd(L)(BIBP)]center dot 1/2DMF center dot 3/2H(2)O (2), [Cd-3(L)(3)(phen)(2)] (3), [Mn-3(L)(3)(phen)(2)](n) (4), and [Mn-2(L)(2)(DMF)center dot(H2O)]center dot DMF (5) (H2L = 2',5'-dimethyl-1,1':4',1 ''-terphenyl-3,3 ''- dicarboxylic acid, BIP = 4,4'-bis(imidazol-1-yl)phenyl, BIBP = 4,4'-bis(imidazol-1-yl)biphenyl, phen = 1,10-phenanthroline and DMF = N,N-dimethylformamide), have been synthesized under solvothermal conditions. Complexes 1 and 2 display similar 3-fold interpenetrating 3D frameworks with {4(12)center dot 6(3)} pcu topology, but they both possess different structures. Complexes 3 and 4 show non-interpenetrating 3D networks with pcu topology constructed by L-2-ligands and phen ligands. Complex 5 is a non-interpenetrating 3D framework based on infinite rod-shaped SBUs. Obviously, with the increase of the steric hindrance or the use of rigid rod-shaped SBUs, complexes 3-5 have efficiently avoided interpenetration. All the complexes are characterized using single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), IR spectra, and elemental analyses. Moreover, thermal stabilities for 1-5 and photoluminescence properties of 2 and 3 have been investigated. The antiferromagnetic properties of 1, 4, and 5 have also been studied.