Two-dimensional metal-organic frameworks (MOFs) constructed from heterotrinuclear coordination units and 4,4 '-biphenyldicarboxylate ligands

Three novel metal - organic frameworks ( MOFs) formulated as [ Zn2M(BPDC)(3)( DMF)(2)]center dot 4DMF ( M = Co-II 1, Ni-II 2 or Cd-II 3; BPDC = 4,4'- biphenyldicarboxylate; DMF = N, N'-dimethylformamide) have been prepared via solvothermal synthesis from mixtures of the corresponding transition metal salts and 4,4'- biphenyldicarboxylic acid ( H2BPDC). The framework structures are characterized by single-crystal X- ray diffraction analysis, IR and UV- vis diffuse reflectance spectroscopy, thermogravimetric analysis ( TGA), and X- ray powder diffraction ( XRPD). All three compounds possess essentially the same 2-D layered coordination framework consisting of linear heterotrinuclear secondary building units ( SBUs) connected by rigid bridging BPDC ligands. Crystal data: for 1 ( C60H66CoN6O18Zn2): monoclinic, space group P2(1/)n, M = 1348.86, a = 20.463(4), b = 14.819(3), c = 23.023(5) angstrom, beta = 111.75( 3)degrees, V = 6484( 2) angstrom(3), Z = 4, D-c = 1.382 Mg m(-3). For 2 ( C60H66N6NiO18Zn2): monoclinic, space group P2(1)/ n, M = 1348.64, a = 11.670( 2), b = 14.742( 3), c = 19.391( 4) angstrom, beta = 102.29(3)degrees, V =3259.5(11) angstrom(3), Z = 2, D-c = 1.374 Mg m(-3). For 3 ( C60H66CdN6O18Zn2): monoclinic, space group P2(1)/n, M = 1402.33, a = 11.491(2), b = 14.837( 3), c = 19.386( 4) angstrom, beta = 101.53( 3)degrees, V = 3238.3( 11) angstrom(3), Z = 2, D-c = 1.438 Mg m(-3).