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Issue 34, 2018
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Multivariant synthesis, crystal structures and properties of four nickel coordination polymers based on flexible ligands

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Abstract

Four new Ni(II) coordination polymers, namely, [Ni(HL)(bpe)(H2O)2]n·nH2O (1), [Ni2(L)(bpe)(μ3-OH)(H2O)]n·3nH2O (2), [Ni(L)(bpe)(H2O)]n·[Ni0.5(bpe)0.5(H2O)2]n·nH2O (3) and [Ni(HL)(bpe)(H2O)]n·3nH2O (4) based on flexible ligands 5-(3-carboxybenzyloxy)-isophthalic acid (H3L) and 1,2-bis(4-pyridyl)ethane (bpe) have been successfully synthesized under different conditions. Compounds 1 and 4 present two-dimensional sql layer structures, while compound 2 exhibits a three-dimensional structure based on a tetranuclear Ni(II) cluster with (3,8)-connected tfz-d topology, and compound 3 consists of a 2D sql anionic layer and 1D linear cationic chains, which are further entangled to give an interesting 2D + 1D → 3D poly-pseudorotaxane framework. To determine the relationship between these diverse structures and external synthetic influence factors, we systematically change the molar ratios of the reactants, solvent and pH and study their effects. Furthermore, the structural transformation from compound 4 to 3 has also been investigated.

Graphical abstract: Multivariant synthesis, crystal structures and properties of four nickel coordination polymers based on flexible ligands

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Publication details

The article was received on 21 May 2018, accepted on 28 Jul 2018 and first published on 30 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00837J
Citation: CrystEngComm, 2018,20, 5045-5055
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    Multivariant synthesis, crystal structures and properties of four nickel coordination polymers based on flexible ligands

    S. Lu, K. Fang, Y. Liu, M. Li, S. Liu and X. He, CrystEngComm, 2018, 20, 5045
    DOI: 10.1039/C8CE00837J

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