Non-covalent Bonded 3D Supramolecular Architectures Based on Acid-base Adducts

摘要

Two novel acid-base adducts,[H_2L_1^(2+)](Hpbda)_2(1,L_1 = l,4-di(lH-imidazol-4-yl)benzene,H_2pbda = 1,4-benzenedicarboxylic acid) and[H_2L_2^(2+)](NO_3)_2(2,L_2 = l,4-di(l-carboxymethyl-imidazol-4-yl)benzene),have been prepared and characterized by single-crystal X-ray diffraction,IR spectroscopy and elemental analysis.Compound 1 crystallizes in monoclinic,space group P2_1/n with a = 5.3525(11),b = 9.1471(19),c = 19.314(4) ?,β = 92.342(3)°,V= 944.8(3) ?~3,Z = 2,C_(16)H_(16)N_6O_(10),M_r = 452.35,D_c = 1.590 g/cm^3,μ = 0.135 mm^(-1),S = 1.058,F(000) = 468,the final R = 0.0661 and wR = 0.1887 for 2298 observed reflections(I> 2σ(I)).Compound 2 crystallizes in monoclinic,space group P2_1/c with a = 9.6923(10),b = 17.2950(17),c = 7.1880(7) ?,β =94.801(2)°,V= 1200.7(2) ?~3,Z = 2,C_(28)H_(22)N_4O_8,M_r = 542.50,D_c = 1.501 g/cm^3,μ = 0.112 mm^(-1),S= 1.060,F(000) = 564,the final R = 0.0394 and wR = 0.1017 for 2768 observed reflections(I >2σ(I)).In the title compounds,both of L_1 and L_2 ligands act as weak base to accept protons to exhibit diprotonated H_2L_1^(2+) and H_2L_2^(2+) form,which can effectively employ as hydrogen bonding donors to combine anion moieties to form binary adducts respectively.In the crystal packing diagram of two polymers,there exist extensive noncovalent interactions including charge-transfer interactions,C(N)-H…π and N-H…O,C-H…O,O-H…O hydrogen bonding interactions between co-crystal moieties which consolidate the structures of supramolecular polymers,thus generating three-dimensional(3D) frameworks.