Diverse topologies of six coordination polymers constructed from a tris(4-imidazolylphenyl)amineligand and different carboxylates

Abstract

In this article, six new coordination polymers, namely, [Zn(Tipa)(L1)]·H₂O (1), [Zn₂(Tipa)(L2)(μ₂-O)]·2H₂O (2), [Zn₂(Tipa)(L3)]·3.5H₂O (3), [Mn(Tipa)(L2)]·H₂O (4), [Cu₄(Tipa)₄(L4)₂(CH₃OH)₂(H₂O)₂]·2(L4)·3(CH₃OH)·8(H₂O) (5), and Co₃(Tipa)₂(L4)₃ (6), where H₂L1 = 1,3-benzenedicarboxylic acid, H₃L2 = 1,3,5-benzenetricarboxylic acid, H₄L3 = 1,2,4,5-benzenetetracarboxylic, H₂L4 = 1,4-benzenedicarboxylic acid and Tipa = tris(4-imidazolylphenyl)amine, have been synthesized by varying the carboxylates and metals under hydrothermal conditions. Compound 1 shows a 2D → 3D framework with parallel polycatenation of undulated square layers (sql). Compound 2 displays a 3D 3,4-connected (5·6²·8²·9)(6³·7²·9)(7³)(6²·8) topology, while compound 3 reveals a 3D 3,4,6-connected (4²·6²·7·8)(4·6·8³·10)(6·8·10)(4⁴·5²·6⁷·7·8)(4²·8²·10²) topology. Compound 4 shows a 2D undulate layer. Compound 5 exhibits an unprecedented 2D → 2D polyrotaxane network with (3,4)-connected (4·5²)(4·5³·7²) topology. Interestingly, the neighboring 2D polyrotaxane sheets are sandwiched by the free L4 ligands. Compound 6 is an unusual example of a 3D 2-fold interpenetrating framework with polyrotaxane feature. The effects of the carboxylates and metals have been elucidated. The IR spectra, elemental analyses and luminescent properties for the compounds have also been investigated.