Supramolecular detection of metal ion binding: Ligand conformational control of cholesteric induction in nematic liquid crystalline phases

Steffen Zahn, Gloria Proni, Gian Piero Spada, James Canary

Research output: Contribution to journalArticle

Abstract

Tripodal tetradentate ligands may act as chemosensor molecules. Their ability to torque a nematic into a cholesteric phase increases upon complexation with copper ion. Moreover, changes in overall shape of the complexes induced by different metals and counter ions were transferred sensitively to the supramolecular level, observed by proportionate changes in the degree of twisting. Modification of the oxidation state of the metal center also gave large changes in twisting power; this suggests potential application in electrochemical molecular switches. The handedness of the induced cholesteric phase is related to the stereochemistry of the ligand: The small amount of chiral dopant needed for the LC technique (less than 2 nmol) suggests the possible determination of the absolute configuration of the parent primary amines of the ligands.

Original languageEnglish (US)
Pages (from-to)88-93
Number of pages6
JournalChemistry - A European Journal
Volume7
Issue number1
StatePublished - Jan 5 2001

Fingerprint

Metal ions
Ligands
Crystalline materials
Liquids
Stereochemistry
Complexation
Amines
Copper
Torque
Metals
Switches
Doping (additives)
Ions
Oxidation
Molecules

Keywords

  • Chirality
  • Circular dichroism
  • Coordination chemistry
  • Liquid crystals
  • Supramolecular chemistry

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Supramolecular detection of metal ion binding : Ligand conformational control of cholesteric induction in nematic liquid crystalline phases. / Zahn, Steffen; Proni, Gloria; Spada, Gian Piero; Canary, James.

In: Chemistry - A European Journal, Vol. 7, No. 1, 05.01.2001, p. 88-93.

Research output: Contribution to journalArticle

@article{e232b4574fbc4b039e46fa2691213d1a,
title = "Supramolecular detection of metal ion binding: Ligand conformational control of cholesteric induction in nematic liquid crystalline phases",
abstract = "Tripodal tetradentate ligands may act as chemosensor molecules. Their ability to torque a nematic into a cholesteric phase increases upon complexation with copper ion. Moreover, changes in overall shape of the complexes induced by different metals and counter ions were transferred sensitively to the supramolecular level, observed by proportionate changes in the degree of twisting. Modification of the oxidation state of the metal center also gave large changes in twisting power; this suggests potential application in electrochemical molecular switches. The handedness of the induced cholesteric phase is related to the stereochemistry of the ligand: The small amount of chiral dopant needed for the LC technique (less than 2 nmol) suggests the possible determination of the absolute configuration of the parent primary amines of the ligands.",
keywords = "Chirality, Circular dichroism, Coordination chemistry, Liquid crystals, Supramolecular chemistry",
author = "Steffen Zahn and Gloria Proni and Spada, {Gian Piero} and James Canary",
year = "2001",
month = "1",
day = "5",
language = "English (US)",
volume = "7",
pages = "88--93",
journal = "Chemistry - A European Journal",
issn = "0947-6539",
publisher = "Wiley-VCH Verlag",
number = "1",

}

TY - JOUR

T1 - Supramolecular detection of metal ion binding

T2 - Ligand conformational control of cholesteric induction in nematic liquid crystalline phases

AU - Zahn, Steffen

AU - Proni, Gloria

AU - Spada, Gian Piero

AU - Canary, James

PY - 2001/1/5

Y1 - 2001/1/5

N2 - Tripodal tetradentate ligands may act as chemosensor molecules. Their ability to torque a nematic into a cholesteric phase increases upon complexation with copper ion. Moreover, changes in overall shape of the complexes induced by different metals and counter ions were transferred sensitively to the supramolecular level, observed by proportionate changes in the degree of twisting. Modification of the oxidation state of the metal center also gave large changes in twisting power; this suggests potential application in electrochemical molecular switches. The handedness of the induced cholesteric phase is related to the stereochemistry of the ligand: The small amount of chiral dopant needed for the LC technique (less than 2 nmol) suggests the possible determination of the absolute configuration of the parent primary amines of the ligands.

AB - Tripodal tetradentate ligands may act as chemosensor molecules. Their ability to torque a nematic into a cholesteric phase increases upon complexation with copper ion. Moreover, changes in overall shape of the complexes induced by different metals and counter ions were transferred sensitively to the supramolecular level, observed by proportionate changes in the degree of twisting. Modification of the oxidation state of the metal center also gave large changes in twisting power; this suggests potential application in electrochemical molecular switches. The handedness of the induced cholesteric phase is related to the stereochemistry of the ligand: The small amount of chiral dopant needed for the LC technique (less than 2 nmol) suggests the possible determination of the absolute configuration of the parent primary amines of the ligands.

KW - Chirality

KW - Circular dichroism

KW - Coordination chemistry

KW - Liquid crystals

KW - Supramolecular chemistry

UR - http://www.scopus.com/inward/record.url?scp=0035808371&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035808371&partnerID=8YFLogxK

M3 - Article

C2 - 11205030

AN - SCOPUS:0035808371

VL - 7

SP - 88

EP - 93

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

IS - 1

ER -