Four new transition metal coordination polymers based on mixed 4-imidazole and carboxylate-sulfonate ligands: Syntheses, structures, and properties

Four new metal-organic coordination polymers [Zn(HL)(SIP)(H2O)]center dot 2H(2)O (1), [Cd-2(L)(H2L)(SIP)(2)] (2), [Cu-2(L)(2)(SIP)(OH)]center dot 2H(2)O (3) and [Ni-3(L)(4)(SIP)(2)(H2O)(4)]center dot 6.5H(2)O (4) were obtained by reactions of the different metal(II) salts with mixed ligands including sodium 5-sulfoisophthalate (Na3SIP) and 1,4-di(1H-imidazole-4-yl)benzene (L), respectively. All compounds were characterized by FT-IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The study indicates that different natures of metal ions play crucial roles in modulating the formation of the resulting frameworks. Compound 1 is a one-dimensional (1D) chain structure, and 2 is a (3, 8)-connected tfz-d three-dimensional (3D) net with a Point (Schlafli) symbol of (4(3))(2)(4(6).6(18).8(4)). Complex 3 has (3, 5)-connecting node two-dimensional (2D) network with a Point (Schlafli) symbol of (4(2).6(7).8)(4(2).6) based on the {Cd-2(OH)(SO3)}(n)(2+) binuclear Cd(II) motif, while 4 is a rare 2D + 2D -> 3D poly catenated framework resulting from two different kinds of (4, 4) 2D layers. The photoluminiscent properties as well as quantum yield (QY) and luminescence lifetime are also investigated for compounds 1 and 2 in the solid state.