Synthesis And Crystal Structures Of Zn(Ii) And Cd(Ii) Coordination Polymers Derived From The Flexible N-(4-Carboxyphenyl)Iminodiacetic Acid And Auxiliary Ligands

Two coordination polymers [Cd-3(CPIDA)(2)(bib) (H2O)(2)](n) 1 and {[Zn-6(CPIDA)(4)(bix)(3)]center dot 8H(2)O}(n) 2 (H(3)CPIDA = N-(4-carboxyphenyl) iminodiacetic acid, bib = 1,4-bis (N-imidazolyl)butane, bix = 1,4-bis(imidazol-1-ylmethyl) benzene), have been hydrothermally synthesized and characterized by analytical and IR spectroscopic data. Compound 1 displays an interesting 3D framework with trinodal (4,5)-connected topology, consisting of (4,4) rectangular grid double layers linked by trans-bib ligands. In 2, the corrugated nets with couples of central symmetrical chains constructed by CPIDA(3-) and bridging trans-bix ligands are pillared by infinite tubes made from CPIDA(3-) and cis-bix ligands to build a new 3D porous framework with parallelogram-shaped channels, exhibiting a pentanodal (3,4)-connected topology. Moreover, compounds 1 and 2 show intense solid state fluorescence at room temperature.