Pyrrole and polypyrrole-based liquid crystals containing azobenzene mesogenic groups was written by Chen, Yu;Harrison, William T. A.;Imrie, Corrie T.;Ryder, Karl S.. And the article was included in Journal of Materials Chemistry in 2002.Category: esters-buliding-blocks This article mentions the following:
The thermotropic and electrochem. properties and polymerization of a series of N-substituted pyrrole monomers bearing mesogenic 4-substituted azobenzene attached as a pendant group via alkyl spacers were discussed. The effects of azobenzene moiety substitution with methoxy, cyano and nitro terminal groups upon mol. properties were discussed. Addnl. the first crystal structure determination and anal. of two N-alkylpyrroles bearing mesogenic groups was presented. In the experiment, the researchers used many compounds, for example, Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7Category: esters-buliding-blocks).
Ethyl 4-methyl-1H-pyrrole-3-carboxylate (cas: 2199-49-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics