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Issue 5, 2011
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Competition between coordination and hydrogen bonding in networks constructed using dipyridyl-1H-pyrazole ligands

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Abstract

The reaction between zinc(II) acetate and 3,5-di(4-pyridyl)-1H-pyrazole (HL11) is crucially dependent on the solvent, with products based on different architectures formed in DMF, methanol and water. When the reaction is undertaken in DMF, the product is [Zn3(OAc)6(HL11)4] 1, in which Zn(OAc)2 centres link Zn2(OAc)4(HL11)4 units into double-stranded zig-zag chains. Each chain is ‘broken’ after every fourth HL11 ligand, though the links between the chains ensure a coordination polymer is formed. The reaction in methanol produces [Zn(OAc)2(HL11)]·0.5MeOH 2 which also contains double-stranded chains, though in this case both chains are continuous. The hydrothermal reaction gives [Zn(OAc)2(HL11)2]·H2O 3, which contains discrete zinc complex molecules that are linked into double-stranded chains through hydrogen bonds. Zinc(II) chloride reacts with HL11 to form [ZnCl2(L11)] 4. The structure of 4 consists of chains that are cross-linked into sheets by N–H⋯Cl hydrogen bonds. The nitrates of zinc(II), cobalt(II) and nickel(II) react with 3,5-di(3-pyridyl)-1H-pyrazole (HL22) to form [M(MeOH)4(HL22)2](NO3)2·2H2O (5, M = Zn; 6, M = Co; 7, M = Ni). These isostructural compounds contain discrete cations that are linked into double-stranded chains by O–H⋯N hydrogen bonds, with further hydrogen bonds connecting these into sheets. The structures of 1–3 and 5–7 all contain double-stranded chains, with both bridging ligands and hydrogen bonds linking individual chains into pairs.

Graphical abstract: Competition between coordination and hydrogen bonding in networks constructed using dipyridyl-1H-pyrazole ligands

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Publication details

The article was received on 16 Jun 2010, accepted on 04 Nov 2010 and first published on 30 Nov 2010


Article type: Paper
DOI: 10.1039/C0CE00310G
Citation: CrystEngComm, 2011,13, 1676-1682
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    Competition between coordination and hydrogen bonding in networks constructed using dipyridyl-1H-pyrazole ligands

    A. D. Burrows, D. J. Kelly, M. I. Haja Mohideen, M. F. Mahon, V. M. Pop and C. Richardson, CrystEngComm, 2011, 13, 1676
    DOI: 10.1039/C0CE00310G

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