NDLI: Ring effect on helical twisting power of optically active mesogenic esters derived from benzene, bicyclo[2.2.2]octane and p-carborane carboxylic acids

Please wait, while we are loading the content...

Ring effect on helical twisting power of optically active mesogenic esters derived from benzene, bicyclo[2.2.2]octane and p-carborane carboxylic acids

Content Provider	Semantic Scholar
Author	Januszko, Adam Walerian Kaszyński, Piotr Drzewiński, Witold
Copyright Year	2006
Abstract	Three structurally similar esters containing carborane (1A), bicyclo[2.2.2]octane (1B), and benzene (1C) were prepared and their mesogenic properties investigated. All esters exhibited chiral nematic phases, and only 1B showed rich smectic behavior. The esters were used as additives to three structurally different nematic hosts. The resulting cholesteric pitch p was measured as a function of concentration and temperature. The calculated helical twisting power βM followed the order 1A < 1B ≤ 1C, and the temperature dependence of βM was ≥0 for all mixtures except for 1C in host I. These results are discussed in terms of size and conformational properties of each ring system A–C and the role of their “biaxiality” in chirality transfer. The observed trends in βM are consistent with non-specific solute–solvent interactions in which the chiral additive breaks the uniaxial symmetry imposed by the phase and differentiates energy of the chiral conformers of the host.
Starting Page	452
Ending Page	461
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1039/B512319D
Volume Number	16
Alternate Webpage(s)	https://www.vanderbilt.edu/AnS/Chemistry/omrg/Articles/JMC_452_06.pdf
Alternate Webpage(s)	http://www.rsc.org/suppdata/jm/b5/b512319d/b512319d.pdf
Alternate Webpage(s)	https://doi.org/10.1039/B512319D
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in