The effect of low molecular weight organosiloxane substituents on mesophase formation and structure in non-symmetric nickel(II) complexes

I M  Saez; G H  Mehl; E  Sinn; P  Styring

The effect of low molecular weight organosiloxane substituents on mesophase formation and structure in non-symmetric nickel(II) complexes

I M Saez, G H Mehl, E Sinn, P Styring

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Organosiloxane groups have been used as components of metal-containing liquid crystals (metallomesogens). It has been found that the disiloxane unit aids mesophase formation, stabilising an enantiotropic smectic A phase over a wide temperature range. The overall effect of an organodisiloxane unit is to lower the melting point relative to an alkyl substituted complex while increasing the clearing temperature, or leaving it unchanged, and so increasing mesophase temperature range. A model for the mesophase is proposed based on thermo-optical polarized light microscopy and small angle X-ray scattering studies. This proposes that weak nickel-nickel interactions, which are observed in the solid state, are maintained in the mesophase. The unusual steric shape of the organosiloxane group stabilizes the smectic A structure, allowing more efficient packing of the flexible chains. (C) 1998 Elsevier Science S.A.

Original language	English
Pages (from-to)	299-311
Number of pages	13
Journal	JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume	551
Issue number	1-2
Publication status	Published - 30 Jan 1998

Keywords

organosiloxanes
metallomesogens
self-assembly
thermo-optic properties
CRYSTALLINE SILOXANE DERIVATIVES

Cite this

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title = "The effect of low molecular weight organosiloxane substituents on mesophase formation and structure in non-symmetric nickel(II) complexes",

abstract = "Organosiloxane groups have been used as components of metal-containing liquid crystals (metallomesogens). It has been found that the disiloxane unit aids mesophase formation, stabilising an enantiotropic smectic A phase over a wide temperature range. The overall effect of an organodisiloxane unit is to lower the melting point relative to an alkyl substituted complex while increasing the clearing temperature, or leaving it unchanged, and so increasing mesophase temperature range. A model for the mesophase is proposed based on thermo-optical polarized light microscopy and small angle X-ray scattering studies. This proposes that weak nickel-nickel interactions, which are observed in the solid state, are maintained in the mesophase. The unusual steric shape of the organosiloxane group stabilizes the smectic A structure, allowing more efficient packing of the flexible chains. (C) 1998 Elsevier Science S.A.",

keywords = "organosiloxanes, metallomesogens, self-assembly, thermo-optic properties, CRYSTALLINE SILOXANE DERIVATIVES",

author = "Saez, {I M} and Mehl, {G H} and E Sinn and P Styring",

year = "1998",

month = jan,

day = "30",

language = "English",

volume = "551",

pages = "299--311",

journal = "JOURNAL OF ORGANOMETALLIC CHEMISTRY",

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TY - JOUR

T1 - The effect of low molecular weight organosiloxane substituents on mesophase formation and structure in non-symmetric nickel(II) complexes

AU - Saez, I M

AU - Mehl, G H

AU - Sinn, E

AU - Styring, P

PY - 1998/1/30

Y1 - 1998/1/30

N2 - Organosiloxane groups have been used as components of metal-containing liquid crystals (metallomesogens). It has been found that the disiloxane unit aids mesophase formation, stabilising an enantiotropic smectic A phase over a wide temperature range. The overall effect of an organodisiloxane unit is to lower the melting point relative to an alkyl substituted complex while increasing the clearing temperature, or leaving it unchanged, and so increasing mesophase temperature range. A model for the mesophase is proposed based on thermo-optical polarized light microscopy and small angle X-ray scattering studies. This proposes that weak nickel-nickel interactions, which are observed in the solid state, are maintained in the mesophase. The unusual steric shape of the organosiloxane group stabilizes the smectic A structure, allowing more efficient packing of the flexible chains. (C) 1998 Elsevier Science S.A.

AB - Organosiloxane groups have been used as components of metal-containing liquid crystals (metallomesogens). It has been found that the disiloxane unit aids mesophase formation, stabilising an enantiotropic smectic A phase over a wide temperature range. The overall effect of an organodisiloxane unit is to lower the melting point relative to an alkyl substituted complex while increasing the clearing temperature, or leaving it unchanged, and so increasing mesophase temperature range. A model for the mesophase is proposed based on thermo-optical polarized light microscopy and small angle X-ray scattering studies. This proposes that weak nickel-nickel interactions, which are observed in the solid state, are maintained in the mesophase. The unusual steric shape of the organosiloxane group stabilizes the smectic A structure, allowing more efficient packing of the flexible chains. (C) 1998 Elsevier Science S.A.

KW - organosiloxanes

KW - metallomesogens

KW - self-assembly

KW - thermo-optic properties

KW - CRYSTALLINE SILOXANE DERIVATIVES

M3 - Article

SN - 0022-328X

VL - 551

SP - 299

EP - 311

JO - JOURNAL OF ORGANOMETALLIC CHEMISTRY

JF - JOURNAL OF ORGANOMETALLIC CHEMISTRY

IS - 1-2

ER -