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The effect of phenyl substituents on supramolecular assemblies containing directly linked bis-pyridylimine ligands: synthesis and structural characterisation of mononuclear nickel(II) and dinuclear silver(I) and cobalt(III) complexes of (2-pyridyl)phenylketazine
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UNSPECIFIED (2003) The effect of phenyl substituents on supramolecular assemblies containing directly linked bis-pyridylimine ligands: synthesis and structural characterisation of mononuclear nickel(II) and dinuclear silver(I) and cobalt(III) complexes of (2-pyridyl)phenylketazine. DALTON TRANSACTIONS (11). pp. 2149-2155. doi:10.1039/b211006g ISSN 1477-9226.
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Official URL: http://dx.doi.org/10.1039/b211006g
Abstract
The effects of phenyl substituents introduced at the imine carbon of directly-linked bis-pyridylimine ligands is investigated. With octahedral metals the (2-pyridyl) phenylketazine ligand acts as an N-3 donor ligand with a non-coordinated imine unit. The triple-helical [M2L3](4+) complexes (observed with the unsubstituted ligand and in which the ligand uses all four nitrogen atoms) are not observed. A mononuclear [NiL2](2+) complex containing mer-coordinated N-3 ligands and a dinuclear [Co2L2 (OAc)(OH)(2)](3+) containing fac-coordinated ligands are structurally characterised. With silver(I) the library of supramolecular architectures observed for the unsubstituted ligand is driven to a single double-helical architecture by the presence of the phenyl substituents. A dimeric [Ag2L2](2+) double-helical cation is structurally characterised. In addition to the N-4 coordination afforded by the ligands, one of the silver centres in each helicate forms a short contact to a methanol solvent or a tetrafluoroborate anion. Although the double-helical structure can support the addition of four phenyl substituents, it appears that the triple-helical structure is unable to accommodate the steric requirements of six phenyl substituents. Thus in this system, the phenyl substituents destabilise the triple-helical architectures but stabilise double-helical architectures (relative to the alternative competing structures).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | DALTON TRANSACTIONS | ||||
Publisher: | ROYAL SOC CHEMISTRY | ||||
ISSN: | 1477-9226 | ||||
Official Date: | 2003 | ||||
Dates: |
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Number: | 11 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 2149-2155 | ||||
DOI: | 10.1039/b211006g | ||||
Publication Status: | Published |
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