摘要:
Seven Zn(II) and Co(II) coordination polymers based on 5-acetamidoisophthalate (AcAIP) and flexible bis (imidazolyl) ligands, [Zn(H2O)(0.5)(AcAIP)](n) (1), [Zn(AcAIP)(o-BIMB)](n)center dot 3nH(2)O (2), [Co(AcAIP)(o-BIMB)](n)center dot 3nH(2)O (3), [Zn(AcAIP)(m-BIMB)](n)center dot 3nH(2)O (4), [Co(AcAIP)(m-BIMB)](n)center dot 3nH(2)O (5), [Zn(AcAIP)(p-BIMB)](n) (6) and [Co(AcAIP)(p-BIMB)](n) (7) (o-BIMB = 1,2-bis(imidazol-1-yl-methyl) benzene, m-BIMB = 1,3-bis(imidazol-1-yl-methyl) benzene and p-BIMB = 1,4-bis(imidazol-1-yl-methyl) benzene), were synthesized and well characterized. In complex 1, AcAIP serves as a mu(4)-bridge through mu(2),eta(2)-carboxylate, monodentate carboxylate and acetamido, and connects Zn(II) ions into a 3-D network, while acetamido group of AcAIP in 2-7 is not involved in coordination with metal ions owing to the presence of bis(imidazolyl) ligands. Notably, AcAIP in 2-6 bridges two metal ions through two monodentate carboxylate groups. AcAIP in 2-5 connects Zn(II) and Co(II) ions into 1-D chain, subsequent bridge by o-BIMB generates a 2-D corrugated layer, while m-BIMB connects two intra-chained metal ions to form [Zn-2(AcAIP)(m-BIMB)] macrocycles. Interestingly, AcAIP in 6 links two Zn(II) ions into a 16-membered [Zn-2(AcAIP)(2)] macrocycle, and subsequent bridge by anti-conformationed p-BIMB forms a 2-D layer. However, two carboxylate groups of AcAIP in 7 function in mu(2),eta(2)-bridging and chelating modes, AcAIP and gauche-conformationed p-BIMB bridge Co(II) ions to form a twofold interpenetrating framework consisting of dinuclear Co(II)-carboxylate units. Magnetic analysis of complex 7 shows that the existence of antiferromagnetic interactions. Fluorescent properties of Zn(II) coordination polymers in solid state were also investigated. (C) 2015 Published by Elsevier B.V.