64665-93-6Relevant academic research and scientific papers
Photochemical behavior of micellized 4-(4′-alkylstyryl)pyridinium salts
Kozlecki, Tomasz,Wilk, Kazimiera A.
, p. 645 - 651 (2007/10/03)
New photochromic surfactants, l-alkyl-4-(4′-alkylstyryl)lpyridinium halides (CnStzRX; n = 0, 4, 6, 8; R = Me, Et, CH2CH2OH, n-Bu, n-C9H19; X = Br, I), were synthesized and the photochemical behavior of their micellar aggregates in water was characterized in relation to non-micellizing l-methyl-4-stilbazolium ions. Reversible trans-cis isomerization through a photothermal cycle was observed for the micellized CnStzRX. Furthermore, photoreactions upon prolonged irradiation of CnStzRX micelles resulted in a 3-31% formation of thermodynamically least stable syn-head-to-head and ca. 3% of anti- head-to-head dimers. These findings indicate that the self aggregation process of CnStzRX may provide some topologically organized microenvironment affecting the steric and like-charge repulsions of the aggregate components.
Pyridyl-substituted Cyclobutanes via Photodimerisation of Azastilbenes
Horner, Michael,Huenig, Siegfried
, p. 1183 - 1210 (2007/10/02)
Mono- and diazastilbenes A1 - A9 as well as their mono- and dihydro- or -alkyl quaternary salts are irradiated (UV).Mono salts are smoothly converted into cyclobutanes C in crystalline state and/or in solution.The free bases A or their bis salts, reacting in solution only, from partly or exclusively different products.Their structures together with the constitutions and configurations of the cyclobutanes A are elucidated.Results from the literature are partly confirmed and partly corrected.
