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

Andrew D Burrows, D J Kelly, M I H Mohideen, Mary F Mahon, Viorica M Pop, C Richardson

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The reaction between zinc(II) acetate and 3,5-di(4-pyridyl)-1H-pyrazole (HL1) 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 [Zn-3(OAc)(6)(HL1)(4)] 1, in which Zn(OAc)(2) centres link Zn-2(OAc)(4)(HL1)(4) units into double-stranded zig-zag chains. Each chain is 'broken' after every fourth HL1 ligand, though the links between the chains ensure a coordination polymer is formed. The reaction in methanol produces [Zn(OAc)(2)(HL1)]center dot 0.5MeOH 2 which also contains double-stranded chains, though in this case both chains are continuous. The hydrothermal reaction gives [Zn(OAc)(2)(HL1)(2)]center dot H2O 3, which contains discrete zinc complex molecules that are linked into double-stranded chains through hydrogen bonds. Zinc(II) chloride reacts with HL1 to form [ZnCl2(L-1)] 4. The structure of 4 consists of chains that are cross-linked into sheets by N-H center dot center dot center dot Cl hydrogen bonds. The nitrates of zinc(II), cobalt(II) and nickel(II) react with 3,5-di(3-pyridyl)-1H-pyrazole (HL2) to form [M(MeOH)(4)(HL2)(2)](NO3)(2)center dot 2H(2)O (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 center dot center dot center dot 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.
Original languageEnglish
Pages (from-to)1676-1682
Number of pages7
JournalCrystEngComm
Volume13
Issue number5
DOIs
Publication statusPublished - 2011

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Hydrogen bonds
Ligands
ligands
hydrogen
Zinc
Methanol
hydrogen bonds
zinc
Zinc chloride
Cobalt
Nickel
Cations
Nitrates
Polymers
Acetates
methyl alcohol
Positive ions
pyrazole
Molecules
Water

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Competition between coordination and hydrogen bonding in networks constructed using dipyridyl-1H-pyrazole ligands. / Burrows, Andrew D; Kelly, D J; Mohideen, M I H; Mahon, Mary F; Pop, Viorica M; Richardson, C.

In: CrystEngComm, Vol. 13, No. 5, 2011, p. 1676-1682.

Research output: Contribution to journalArticle

Burrows, Andrew D ; Kelly, D J ; Mohideen, M I H ; Mahon, Mary F ; Pop, Viorica M ; Richardson, C. / Competition between coordination and hydrogen bonding in networks constructed using dipyridyl-1H-pyrazole ligands. In: CrystEngComm. 2011 ; Vol. 13, No. 5. pp. 1676-1682.
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abstract = "The reaction between zinc(II) acetate and 3,5-di(4-pyridyl)-1H-pyrazole (HL1) 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 [Zn-3(OAc)(6)(HL1)(4)] 1, in which Zn(OAc)(2) centres link Zn-2(OAc)(4)(HL1)(4) units into double-stranded zig-zag chains. Each chain is 'broken' after every fourth HL1 ligand, though the links between the chains ensure a coordination polymer is formed. The reaction in methanol produces [Zn(OAc)(2)(HL1)]center dot 0.5MeOH 2 which also contains double-stranded chains, though in this case both chains are continuous. The hydrothermal reaction gives [Zn(OAc)(2)(HL1)(2)]center dot H2O 3, which contains discrete zinc complex molecules that are linked into double-stranded chains through hydrogen bonds. Zinc(II) chloride reacts with HL1 to form [ZnCl2(L-1)] 4. The structure of 4 consists of chains that are cross-linked into sheets by N-H center dot center dot center dot Cl hydrogen bonds. The nitrates of zinc(II), cobalt(II) and nickel(II) react with 3,5-di(3-pyridyl)-1H-pyrazole (HL2) to form [M(MeOH)(4)(HL2)(2)](NO3)(2)center dot 2H(2)O (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 center dot center dot center dot 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.",
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AB - The reaction between zinc(II) acetate and 3,5-di(4-pyridyl)-1H-pyrazole (HL1) 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 [Zn-3(OAc)(6)(HL1)(4)] 1, in which Zn(OAc)(2) centres link Zn-2(OAc)(4)(HL1)(4) units into double-stranded zig-zag chains. Each chain is 'broken' after every fourth HL1 ligand, though the links between the chains ensure a coordination polymer is formed. The reaction in methanol produces [Zn(OAc)(2)(HL1)]center dot 0.5MeOH 2 which also contains double-stranded chains, though in this case both chains are continuous. The hydrothermal reaction gives [Zn(OAc)(2)(HL1)(2)]center dot H2O 3, which contains discrete zinc complex molecules that are linked into double-stranded chains through hydrogen bonds. Zinc(II) chloride reacts with HL1 to form [ZnCl2(L-1)] 4. The structure of 4 consists of chains that are cross-linked into sheets by N-H center dot center dot center dot Cl hydrogen bonds. The nitrates of zinc(II), cobalt(II) and nickel(II) react with 3,5-di(3-pyridyl)-1H-pyrazole (HL2) to form [M(MeOH)(4)(HL2)(2)](NO3)(2)center dot 2H(2)O (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 center dot center dot center dot 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.

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