2'-Hydroxybenzylideneanilines and 2-Hydroxyazobenzenes. The Role of Intramolecular O–HźźźN Resonance Assisted Hydrogen Bonds

• Autorzy: Majewska P. , Rospenk M. , Sobczyk L.
• Języki publikacji: EN

Abstrakty

EN

A short review on the effect of the OH groups in the ortho position on the liquid crystalline properties of benzylideneanilines and azobenzenes is presented. Numerous examples show that there are no general rules governing the behaviour of these compounds. How ever one finds most frequently a broadening of the existence range of mesophases both due to a decrease of freez ing temperature and an increase of the isotropisation temperature. In contrast, the presence of strongly polar groups such as –NO2 and –CN leads to a reverse be haviour that can be explained by as suming a strong pi-electron conjugation of these groups with the conjugate-chelatering formed by intramolecular O–HźźźN hydrogen bond. These rings are analyzed by us ing data related to the structure of molecules and infrared spectra in the region of the stretch ing ni(OH) and bend ing delta(OH) and gamma(OH) modes.

Słowa kluczowe

EN

liquid crystals; Schiff bases; azobenzenes; resonance-assisted bonds

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 5
• Strony: 709--721
• Opis fizyczny: Bibliogr. 52 poz., rys.

Twórcy

autor

Majewska P.

autor

Rospenk M.

autor

Sobczyk L.

• Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland,

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