TY - JOUR
T1 - Design of Neutral Metallomesogens from 5,5-Dimethyldipyrromethane: Metal Ion Mediated Control of Folding and Hairpin Structures
AU - Ames, Kelly A.
AU - Collinson, Simon R.
AU - Blake, Alexander J.
AU - Wilson, Claire
AU - Love, Jason B.
AU - Bruce, Duncan W.
AU - Donnio, Bertrand
AU - Guillon, Daniel
AU - Schroeder, Martin
PY - 2008/11
Y1 - 2008/11
N2 - New ligands derived from 5,5-dimethyldipyrromethane and their corresponding neutral complexes with Zn-II and Pd-II are described. The ligands incorporate either a hexacatenar [H2(1(n)), n = 1, 10, 12, 14 and 16], tetracatenar [H-2(2(n)), n = 1 and 16] or an extended dicatenar structure [H-2(3(n)), n = 1 and 16]. Single-crystal X-ray structure determinations of [Zn-2(1(1))(2)] and [Zn-2(3(1))(2)] confirm a distorted tetrahedral geometry at Zn-II to afford double-stranded helical structures, while the Pd-II species [Pd(3(1))] shows a distorted square-planar geometry with the ligand adopting an alternative hairpin conformation. The metal-free hexacatenar ligands H-2(1(n)) (n = 10, 12, 14, 16) and the corresponding complexes [Zn-2(1(16))(2)] and [Pd(1(n))] (n = 12, 14, 16) are not mesomorphic. However, the tetracatenar complex [Zn-2(2(16))(2)] generates a smectic mesophase, as confirmed by X-ray diffraction, while [Pd(2(16))] and the metal-free ligand H-2(2(16)) show no mesomorphic behaviour. Two of the extended dicatenar compounds, H-2(3(16)) and [Zn-2(3(16))(2)] are non-mesomorphic, while [Pd(3(16))] displays a smectic A phase. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
AB - New ligands derived from 5,5-dimethyldipyrromethane and their corresponding neutral complexes with Zn-II and Pd-II are described. The ligands incorporate either a hexacatenar [H2(1(n)), n = 1, 10, 12, 14 and 16], tetracatenar [H-2(2(n)), n = 1 and 16] or an extended dicatenar structure [H-2(3(n)), n = 1 and 16]. Single-crystal X-ray structure determinations of [Zn-2(1(1))(2)] and [Zn-2(3(1))(2)] confirm a distorted tetrahedral geometry at Zn-II to afford double-stranded helical structures, while the Pd-II species [Pd(3(1))] shows a distorted square-planar geometry with the ligand adopting an alternative hairpin conformation. The metal-free hexacatenar ligands H-2(1(n)) (n = 10, 12, 14, 16) and the corresponding complexes [Zn-2(1(16))(2)] and [Pd(1(n))] (n = 12, 14, 16) are not mesomorphic. However, the tetracatenar complex [Zn-2(2(16))(2)] generates a smectic mesophase, as confirmed by X-ray diffraction, while [Pd(2(16))] and the metal-free ligand H-2(2(16)) show no mesomorphic behaviour. Two of the extended dicatenar compounds, H-2(3(16)) and [Zn-2(3(16))(2)] are non-mesomorphic, while [Pd(3(16))] displays a smectic A phase. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
KW - Metallomesogens
KW - Liquid crystals
KW - Helical structures
KW - Coordination chemistry
KW - Supramolecular chemistry
KW - Zinc
KW - Palladium
KW - Pyrromethane
KW - Dipyrrolide
KW - DISCOTIC LIQUID-CRYSTALS
KW - SUPRAMOLECULAR CHEMISTRY
KW - COLUMNAR MESOMORPHISM
KW - PORPHYRIN OCTAESTERS
KW - MOLECULAR-STRUCTURE
KW - PHASE-BEHAVIOR
KW - ALKOXY CHAINS
KW - COMPLEXES
KW - LIGANDS
KW - MESOPHASES
UR - http://www.scopus.com/inward/record.url?scp=56349158002&partnerID=8YFLogxK
U2 - 10.1002/ejic.200800676
DO - 10.1002/ejic.200800676
M3 - Literature review
SN - 1434-1948
SP - 5056
EP - 5066
JO - EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
JF - EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
IS - 32
ER -