2-(hydroxymethyl)-1H-benzo[d]imidazole-5-carboxylic acid as linker for Co(II)/Ni(II)/Cu(II) coordination polymers: Synthesis, structures and properties

摘要: Abstract We report the synthesis and characterization of five transition metal coordination polymers (CPs) based on M(II) (M: Co, Ni Cu), 2-(hydroxymethyl)-1H-benzo[d]imidazole-5-carboxylic acid (H2L) ligand. They are formulated as {[Co2(HL)2(H2O)3(SO4)]·H2O}n (1), {[Co2(HL)2(H2O)2]·SiF6}n (2), {[Ni2(HL)2(H2O)3(SO4)]·2H2O}n (3), {[Ni2(HL)2(H2O)4]·H2O·SiF6}n (4), {[Cu2(HL)2(H2O)2]·SiF6}n (5). The complexes 1–5 structure were characterized by single-crystal X-ray diffraction, elemental analyses, infrared spectroscopy (IR), powder diffraction (PXRD), thermogravimetric analyses (TGA). Complexes two-dimensional (2D) network type that 1–3, 5 crystallize in monoclinic system within centrosymmetric space group P2(1)/c, 4 triclinic P-1 group, they show same modes (κ1-κ1)-(κ1)-(κ1)-μ3 polymers. 1 3 expand to three-dimensional framework means hydrogen bond interactions, can be rationalized three-connected {63} topological network, while 2, 4, exhibit with a four-connected {44·62} sql network. luminescent properties (for 1, 2) UV diffuse reflectance 1–5) solid state at room temperature also investigated discussed. act effective heterogeneous catalysts, under mild conditions, for homocoupling reaction 4-substituted aryl iodides bearing electron-donating groups (-CH3, -OCH3).