The influence of chirality of 3-aryl-3-hydroxypropanoate-based molecules on mesogenic properties of liquid crystals

Ožegović, Antonija (2024) The influence of chirality of 3-aryl-3-hydroxypropanoate-based molecules on mesogenic properties of liquid crystals. Doctoral thesis, Sveučilište u Zagrebu, Prirodoslovno-matematički fakultet.

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Abstract

Chiral liquid crystals (LCs) are promising materials for science and technology due to their optical and mechanical properties. Within this dissertation, a series of dimeric LC molecules with a chiral center within a flexible spacer, introduced via a 3-aryl-3-hydroxypropanoate group, were synthesized. The molecules were synthesized in racemic and enantiomerically pure forms with variations in the spacer length and mesogenic unit. The influence of the chiral center in conjunction with the spacer parity and differently polarizable mesogenic units on their mesogenic properties was investigated, as well as their ability to transfer chirality to an achiral medium. It was demonstrated that odd dimers exhibit a richer mesomorphism than even ones, and that chirality transfer was affected by the spacer parity. A more polarizable mesogenic group alongside the chiral center stabilizes mesogenic properties and induces a temperature inversion of the helix. The difference in surface morphology between the racemic and chiral N*TB phases suggests that chirality in the spacer promotes chiral hierarchy. These results highlight the importance of the position and flexibility of the chiral group within the dimeric molecule for mesomorphic properties and chirality transfer.

Item Type:	Thesis (Doctoral thesis)
Uncontrolled Keywords:	dimers; chiral induction; chiral N*TB phase; chiral spacer; liquid crystals; parity effect
Subjects:	NATURAL SCIENCES > Chemistry > Organic Chemistry
Divisions:	Division of Organic Chemistry and Biochemistry
Projects:	Project title Project leader Project code Project type Strukturna kiralnost vs molekulska kiralnost-SMChiral Andreja Lesac; Jurica Novak IP-2019-04-7978 HRZZ Projekt razvoja karijere mladih istraživača-izobrazba novih doktora znanosti UNSPECIFIED DOK-2020-01-7592 UNSPECIFIED
Depositing User:	Antonija Ožegović
Date Deposited:	28 Aug 2024 08:19
URI:	http://fulir.irb.hr/id/eprint/9020

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