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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bruce, Duncan W.
University of York
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2021Synthesis and mesomorphism of related series of triphilic ionic liquid crystals based on 1,2,4-triazolium cationscitations
- 2015Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(II) complexes with alkylated N3-Schiff basescitations
- 2008Metal-directed columnar phase formation in tetrahedral zinc(II) and manganese(II) metallomesogenscitations
- 2008Design of Neutral Metallomesogens from 5,5-Dimethyldipyrromethane: Metal Ion Mediated Control of Folding and Hairpin Structurescitations
- 2007Liquid-crystalline complexes of 1,10-phenanthroline
- 2001Mesomorphic complexes of the lanthanide elementscitations
- 2000Rare-earth-containing magnetic liquid crystals
Places of action
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article
Design of Neutral Metallomesogens from 5,5-Dimethyldipyrromethane: Metal Ion Mediated Control of Folding and Hairpin Structures
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[H<sub>2</sub>(1<sup>n</sup>), n = 1, 10, 12, 14 and 16], tetracatenar [H<sub>2</sub>(2<sup>n</sup>), n = 1 and 16] or an extended dicatenar structure [H<sub>2</sub>(3<sup>n</sup>), n = 1 and 16].Single crystal X-ray structure determinations on [Zn<sub>2</sub>(1<sup>1</sup>)<sub>2</sub>] and [Zn<sub>2</sub>(3<sup>1</sup>)<sub>2</sub>] confirm a distorted tetrahedral geometry at Zn(II) to afford double-stranded helical structures, while the Pd(II) species [Pd(3<sup>1</sup>)] shows a distorted square planar geometry with the ligand adopting an alternative hairpin conformation.The metal-free hexacatenar ligands H<sub>2</sub>(1<sup>n</sup>) (n = 10, 12, 14, 16) and the corresponding complexes [Zn<sub>2</sub>(1<sup>16</sup>)<sub>2</sub>] and [Pd(1<sup>n</sup>)] (n = 12, 14, 16) are not mesomorphic.However, the tetracatenar complex [Zn<sub>2</sub>(2<sup>16</sup>)<sub>2</sub>] generates a smectic mesophase, as confirmed by X-ray diffraction, while [Pd(2<sup>16</sup>)] and the metal-free ligand H<sub>2</sub>(2<sup>16</sup>) show no mesomorphic behaviour.Two of the extended dicatenar compounds, H<sub>2</sub>(3<sup>16</sup>) and [Zn<sub>2</sub>(3<sup>16</sup>)<sub>2</sub>] are non-mesomorphic, while[Pd(3<sup>16</sup>)] displays a smectic A phase.