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Issue 13, 2013
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Structural and fluorescent regulation of Cd(II) coordination polymers with homoterephthalate by N-donor second ligands

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Abstract

This work reports the synthesis and fluorescence of a series of five Cd(II) coordination polymers with a variety of structure topologies. Homoterephthalic acid (H2htpa) reacts with Cd(OAc)2 to produce the coordination polymer [Cd(htpa)(H2O)]n (1). If a kind of dipyridyl-type second linear ligand is introduced into the synthetic system, three interpenetrating complexes are isolated, namely, [Cd(htpa)(bpp)]n (2), [Cd(htpa)(bpe)]n (3), and [Cd3(htpa)2(bpa)2(OAc)2]n (4) (bpp = 1,3-di(4-pyridyl)propane, bpe = 1,2-di(4-pyridyl)ethylene, and bpa = 1,2-bi(4-pyridyl)ethane), whereas the use of a circular second ligand, 1,2,4-triazole (Htrz), leads to a porous 3D framework {[Cd3(htpa)(trz)3(OAc)(H2O)4]·4H2O}n (5). Complex 1 has parallel Cd–O inorganic chains linked further by the htpa ligands forming individual 2D Cd(II)–carboxylate layers, complex 2 features the parallel interpenetration of two coincident 44 net sheets producing an overall 2D → 2D entanglement topology, complex 3 displays the inclined interpenetration of two sets of parallel corrugated 44 net sheets giving an overall 2D → 3D entanglement topology, complex 4 displays the normal interpenetration of three pcu nets affording an overall 3D → 3D entanglement topology, and complex 5 is characterized as Cd–triazolate layers cohered further by carboxylate linkers affording a single (3,5)-connected 3D open-framework (gra topology) with H-bonding water chains encapsulated in the cavities. The five complexes display a wide range of fluorescent emission behaviors, which are tentatively related with the local ligand environments with the different degrees of inter-chromophore coupling.

Graphical abstract: Structural and fluorescent regulation of Cd(ii) coordination polymers with homoterephthalate by N-donor second ligands

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Publication details

The article was received on 31 Oct 2012, accepted on 17 Jan 2013 and first published on 18 Jan 2013


Article type: Paper
DOI: 10.1039/C3CE26781D
Citation: CrystEngComm, 2013,15, 2428-2437
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    Structural and fluorescent regulation of Cd(II) coordination polymers with homoterephthalate by N-donor second ligands

    G. Liu, X. Li, X. Li and L. Wang, CrystEngComm, 2013, 15, 2428
    DOI: 10.1039/C3CE26781D

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