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).
|
Due to copyright restrictions, this file is not available for public download Click here to request a copy from the OU Author. |
| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1002/ejic.200800676 |
|---|---|
| Google Scholar: | Look up in Google Scholar |
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.
| Item Type: | Journal Article |
|---|---|
| Copyright Holders: | 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| ISSN: | 1099-0682 |
| Funders: | EPSRC |
| Keywords: | metallomesogens; liquid crystals; helical structures; co-ordination chemistry; supramolecular chemistry; zinc; palladium; pyrromethane; dipyrrolide |
| Academic Unit/Department: | Science > Life, Health and Chemical Sciences Other Departments > Other Departments |
| Item ID: | 31294 |
| Depositing User: | Simon Collinson |
| Date Deposited: | 13 Jan 2012 11:32 |
| Last Modified: | 30 Oct 2012 15:17 |
| URI: | http://oro.open.ac.uk/id/eprint/31294 |
Actions (login may be required)
| View Item | |
| Public: Report issue / request change |