Construction of two new coordination polymers based on semirigid tripodal carboxylic acid

Two new complexes, {[Cd-3(cpia)(2)(bix)(3)center dot(H2O)(2)]center dot H2O}(n) (1) and {[Co(Hcpia)(tib)]center dot H2O center dot DMF}(n) (2), have been synthesized by the solvothermal reaction of semirigid tripodal carboxylate 5-(4'-carboxylphenoxy) isophthalic acid (H(3)cpia) with imidazolyl-based auxiliary ligands: 4-bis(imidazol-1-ylmethyl) benzene (bix) and 1,3,5-tris(1-imidazolyl) benzene (tib). Complex 1 reveals a 4-fold interpenetrated three-dimensional framework, which is generated by joining the right- and left- [Cd(bix)](n) helical chains with cpia(3) ions. Complex 2 reveals a ABAB stacked mode, constructed by the stacking of two-dimensional (2D) bilayer network. In addition, the luminescent property and UV-Vis absorption in the solid state of complexes 1 and 2 have been studied. (C) 2014 Elsevier B.V. All rights reserved.