A series of coordination polymers based on 5,5′-(ethane-1,2-diyl)-bis(oxy)diisophthalic acid and structurally related N-donor ligands: syntheses, structures and properties

Abstract

Ten new coordination polymers, namely, [Ni2(L)(H2O)3]·5H2O (1), [Ni2(L)(pbib)2(H2O)]·H2O (2), [Co2(L)(pbib)1.5]·2.5H2O (3), [Co2(L)(bbtz)1.5(H2O)5] (4), [Ni(L)0.5(biim-3)0.5(H2O)(CH3CH2OH)0.5]·2H2O (5), [Zn3(L)(biim-3)(OH)2] (6), [Ni(L)0.5(btp)(H2O)2]·H2O (7), [Zn2(L)(btp)2]·3H2O (8), [Co(L)0.5(btb)0.5(H2O)2]·1.5H2O (9), and [Zn(L)0.5(btb)]·0.5H2O (10), where pbib = 1,4-bis(imidazol-1-ylmethyl)benzene, bbtz = 1,4-bis(1H-1,2,4-triazol-1-ylmethyl)benzene, biim-3 = 1,3-bis(imidazol-1-yl)propane, btp = 1,3-bis(1,2,4-triazol-1-yl)propane, btb = 1,4-bis(1,2,4-triazol-1-yl)butane, and H4L = 5,5′-(ethane-1,2-diyl)-bis(oxy)diisophthalic acid, have been synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by infrared spectra (IR), elemental analyses, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Compound 1 features a 2-fold interpenetrating diamond-like framework. Compound 2 is a 3D 4-connected net with the (86)(73·82·9)(82·92·102)(82·94) topology. Compound 3 is a 3D 2-fold interpenetrating framework with the (5·62)(4·54·6)(42·58·85) topology. Compound 4 shows a rare 3D (4,7)-connected net with the (3·4·5·63)(32·42·5·613·73) topology. Compounds 5 and 6 exhibit 3D 2-fold interpenetrating frameworks with the (52·62·82)(42·82·92)(4·54·6) and (54·62) (58·66·7) topologies, respectively. Compounds 7 and 8 are 3D 3-fold interpenetrating frameworks with the 64·82 and (64·82)2(66)2 topologies, respectively. Compound 9 has a (3,4)-connected 2D layer structure with the (4·62)(42·62·82) topology. Compound 10 is a 3D 3-fold interpenetrating framework with the (62·8)(62·82·102) topology. The effects of the L anions, the N-donor ligands, and the metal ions on the structures of the coordination polymers have been discussed. The luminescent properties of 6, 8 and 10 and the optical band gaps of 1–10 have also been investigated in details.