Gas adsorption, magnetic, and fluorescent sensing properties of four coordination polymers based on 1,3,5-tris(4-carbonylphenyloxy)benzene and bis(imidazole) linkers

Four 3D novel coordination polymers (CPs), formulated as {[Co-3(TCPB)(2)(bibp)(2)(dioxane)(2.5)(H2O)(2)]center dot(DMF)}(n) (1), {[Cd-6(TCPB)(4)(bibp)(4)(dioxane)(H2O)(2)]center dot(dioxane)(3)center dot DMF center dot(H2O)(0.5)}(n) (2), {[Co-1.5(TCPB)(bimb)(0.5)(DMF)(dioxane)]}(n) (3), and {[Zn-1.5(TCPB)(2)(bimb)(DMF)(dioxane)(2)]center dot<bold>dioxane</bold>}(n) (4) (H3TCPB = 1,3,5-tris(4-carbonylphenyloxy)benzene, bibp = 4,4-bis(imidazol-1-yl)biphenyl, and bimb = 1,4-bis(imidazol-1-ylmethyl)benzene), have been synthesized under solvothermal conditions and characterized by elemental analyses (EA), single-crystal X-ray diffraction analyses, X-ray powder diffraction analyses (PXRD), IR spectra, and thermogravimetric analyses (TGA). The structural analyses reveal that complex 1 can be simplified as a new 2-nodal (3,10)-{3.4(2)}(2) {3(4).4(10).5(14).6(14).7(2).8}-3,10T3 net, complex 2 has a 3D 2-nodal (3,8)-c network with the point symbols of {4(2).5}(2){4(4).5(9).6(8).7(.)8(3).9}, complex 3 exhibits a novel 3D framework with the point symbol of {4(10).6(32).7.8(2)}{4(3)}(2), and the structure of 4 is a (3,8)-connected {4(3)}(2){4(6).6(18).8(4)}-tfz-d net. Furthermore, gas sorption behaviors of complex 1 for N-2, H-2, CH4, and CO2 have been comprehensively studied at varying temperatures: the results reveal that the adsorption capacity of 1 to N-2 is stronger than those of other gases. Meanwhile, IAST calculations reveal that 1 exhibits excellent selective separation for CO2/CH4. Magnetic measurements indicate that both 1 and 3 have antiferromagnetic interactions within the trinuclear clusters. In addition, the fluorescent measurements showed that 2 and 4 exhibit highly selective and sensitive detection of Fe3+ and Cr3+ ions.