Ferrocene-containing thermotropic liquid crystals: laterally connected twins

Andersch, Jens; Diele, Siegmar; Tschierske, Carsten

doi:10.1039/jm9960601465

Cited by 28 publications

(17 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Non-symmetric dimers have been prepared in which one mesogenic unit is linked via a terminal position while the other is attached in a lateral position [125,127]; for example, Weiss¯og et al [125] synthesised 20 and this exhibits smectic A and nematic phases. There are insuf®cient numbers of examples of this molecular architecture, however, to comment upon structure-property correlations.…”

Section: Laterally Linked Symmetric Liquid Crystal Dimersmentioning

confidence: 99%

Liquid Crystal Dimers

1999

View full text Add to dashboard Cite

A liquid crystal dimer is composed of molecules containing two conventional mesogenic groups linked via a¯exible spacer. These materials show quite different behaviour to conventional low molar mass liquid crystals and in particular their transitional behaviour exhibits a dramatic dependence on the length and parity of the¯exible spacer. In this review a comprehensive overview of the relationships between molecular structure and liquid crystallinity in dimers is provided. This includes a description of the novel modulated and intercalated smectic phases exhibited by dimers.

show abstract

Section: Laterally Linked Symmetric Liquid Crystal Dimersmentioning

confidence: 99%

Liquid Crystal Dimers

1999

View full text Add to dashboard Cite

show abstract

“…32 The synthesis of 20 was reported in which the ferrocenyl group was connected in a lateral position to a rigid linear organic backbone. The molecule displayed a reasonably stable smectic A phase and, in fact, the ferrocenyl group was more stabilizing than a phenyl group in this system.…”

Section: Rapid Growth Of New Compoundsmentioning

confidence: 99%

Monosubstituted thermotropic ferrocenomesogens: an overview 1976-1999

Imrie

Engelbrecht

Loubser

et al. 2001

Appl. Organometal. Chem.

View full text Add to dashboard Cite

Research in the late 1940s in academic institutions, most notably the University of Hull in the UK, led to the development of liquid crystal display technology in the 1970s, which has subsequently had a large impact throughout the world. The liquid crystal technology is based on simple organic molecules. Since the late 1980s, some liquid crystal scientists have turned their attention to investigating the effect of introducing a metal atom into the systems. This review focuses on the major developments in the field of ferrocenyl-containing liquid crystals in which the organometallic group is situated in a terminal position with respect to the core of the molecule. Metallomesogens with terminal metal atoms are not very common, since it can be deduced from the theory of organic liquid crystals that bulky terminal groups would not be conducive to the stabilization of liquid crystal phases. Nevertheless, a terminal ferrocenyl group can stabilize a nematic liquid crystal phase and examples of this will be discussed in this review.

show abstract

“…As expected, the properties of all these compounds differ greatly, because the shape of the dimers depends on these connecting points: they may be linear, T-shaped or H-shaped. [3,[7][8][9][10]. Furthermore, the properties of simple terminal-terminal-linked calamitic dimers strongly depend on the length and parity of all the aliphatic parts, that is, the length of the terminally attached hydrocarbon chains and the length of the aliphatic spacer.…”

Section: Introductionmentioning

confidence: 99%

Banana-calamitic dimers: unexpected mesophase behaviour by variation of the direction of ester linking groups in the bent-core unit

et al. 2010

View full text Add to dashboard Cite

A five-ring bent-core unit and a phenyl benzoate moiety are linked together by means of a flexible spacer. Starting from dimers having different length of the aliphatic parts, that is the terminal alkyloxy chains and the spacer, the direction of each of the four ester connecting groups in the bent-core unit is reversed step by step. In this way thermodynamically stable polar and non-polar mesophases in unusual sequences could be obtained. For instance, a SmC s P AF -SmC ś P AF transition and the existence of two nematic phases (N, N X ) have been observed. The nematic phases of the banana-calamitic dimers exhibit unusual properties comparable to those of the nematic phases reported for some monomeric bent-core mesogens. The electric field-induced enhancement of the SmCP-SmA transition temperature of one compound proves the existence of polar clusters already in the non-polar SmA phase.

show abstract

Ferrocene-containing thermotropic liquid crystals: laterally connected twins

Cited by 28 publications

References 3 publications

Liquid Crystal Dimers

Liquid Crystal Dimers

Monosubstituted thermotropic ferrocenomesogens: an overview 1976-1999

Banana-calamitic dimers: unexpected mesophase behaviour by variation of the direction of ester linking groups in the bent-core unit

Contact Info

Product

Resources

About