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Ames, Kelly A.; Collinson, Simon R.; Blake, Alexander J.; Wilson, Claire; Love, Jason B.; Bruce, Duncan W.; Donnio, Bertrand; Guillon, Daniel and Schröder, Martin
(2008).
DOI: https://doi.org/10.1002/ejic.200800676
Abstract
New ligands derived from 5,5-dimethyldipyrromethane and their corresponding neutral complexes with Zn(II) and Pd(II) are described. The ligands incorporate either hexacatenar [H2(1n), n = 1, 10, 12, 14 and 16], tetracatenar [H2(2n), n = 1 and 16] or an extended dicatenar structure [H2(3n), n = 1 and 16]. Single crystal X-ray structure determinations on [Zn2(11)2] and [Zn2(31)2] confirm a distorted tetrahedral geometry at Zn(II) to afford double-stranded helical structures, while the Pd(II) species [Pd(31)] shows a distorted square planar geometry with the ligand adopting an alternative hairpin conformation. The metal-free hexacatenar ligands H2(1n) (n = 10, 12, 14, 16) and the corresponding complexes [Zn2(116)2] and [Pd(1n)] (n = 12, 14, 16) are not mesomorphic. However, the tetracatenar complex [Zn2(216)2] generates a smectic mesophase, as confirmed by X-ray diffraction, while [Pd(216)] and the metal-free ligand H2(216) show no mesomorphic behaviour. Two of the extended dicatenar compounds, H2(316) and [Zn2(316)2] are non-mesomorphic, while [Pd(316)] displays a smectic A phase.
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About
- Item ORO ID
- 31294
- Item Type
- Journal Item
- ISSN
- 1099-0682
- Project Funding Details
-
Funded Project Name Project ID Funding Body Not Set Not Set EPSRC (Engineering and Physical Sciences Research Council) - Keywords
- metallomesogens; liquid crystals; helical structures; co-ordination chemistry; supramolecular chemistry; zinc; palladium; pyrromethane; dipyrrolide
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Other Departments > Other Departments
Other Departments - Copyright Holders
- © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- Depositing User
- Simon Collinson