Shao Yun Hao

Sonochemical synthesis of two nanostructured silver(I) coordination polymers based on semi-rigid bis(benzimidazole) ligands

Nanoparticles of two silver(I) coordination polymers (CPs), [Ag2(L1)2(DCTP)]n (1) and [Ag2(L2)(DCTP)]n (2) (L1=1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, L2=1,4-bis(benzimidazol-1-yl)-2-butene, H2DCTP=2,5-dichloroterephthalic acid), were synthesized by the sonochemical approach and hydrothermal method. Both CPs were characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction, scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). CP 1 exhibits a 2D 4-connected sql net with the point symbol {44.62}. While CP 2 displays a 2D 3,4-connected 3,4L13 net with the point symbol {4.62}2{42.62.82}. The structural diversity indicates that semi-rigid bis(benzimidazole) co-ligands play important roles in tuning the structures of the mixed Ag(I) CPs. The ultrasound irradiation time, temperature, and power showed significant effects on the morphology and growth process of the nanoparticles of two silver(I) CPs. The luminescence and photocatalytic properties of the nanoparticles of CPs 1-2 on the degradation of methyl blue (MB) were also investigated in detail.

Three-dimensional nickel(II) and cobalt(II) coordination polymers constructed from 2,5-dichloroterephthalic acid and bis(imidazole) ligands

Two ternary mixed-ligand coordination polymers (CPs), namely [Ni(L)2(DCTP)]n (1) and [Co(L)(DCTP)]n (2), have been hydrothermally synthesized by reacting different transition metal salts with 2,5-dichloroterephthalic acid (H2DCTP) and 4,4′-[bis(imidazol-1-ylmethylene)]biphenyl (L) as ligands. Both CPs 1 and 2 were characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction; CP 1 exhibits a non-interpenetrated six-connected α-Po (or pcu net) framework structure, with the point symbol {412·63}. CP 2 shows a fivefold-interpenetrating four-connected sqc6 topology with the point symbol {66}. The thermal stabilities, luminescence and catalytic properties of both CPs for the degradation of methyl orange in a Fenton-like process have been investigated.