نتایج جستجو برای: polyenes
تعداد نتایج: 951 فیلتر نتایج به سال:
The amphiphilic polyene amphotericin B, a powerful treatment for systemic fungal infections, is shown to exhibit a critical aggregation concentration, and to form giant helically-twisted nanostructures via self-assembly in basic aqueous solution.
Compound 1 reacts with compounds of the transition metals Fe, Ni, Rh, Mn, Cr, or M o to form dark brown to black solids, whose insolubility and relative nonvolatility make their characterization difficult. However, black “FePlo,” formed immediately upon reaction with FeCI, in T H F at room temperature exhibits-like 1 -an IR band at 8 15 cm I, which is evidence for an intact aromatic Ps ring as ...
Room temperature absorption and emission spectra of the all-trans isomers of decatetraene, dodecapentaene, tetradecahexaene, and hexadecaheptaene have been obtained in a series of nonpolar solvents. The resolved vibronic features in the optical spectra of these model systems allow the accurate determination of S(0) (1(1)A(g)(-)) --> S(2) (1(1)B(u)(+)) and S(1) (2(1)A(g)(-)) --> S(0) (1(1)A(g)(-...
We present a comprehensive study, by femtosecond pump–probe spectroscopy, of excited state dynamics in a polyene that approaches the infinite chain limit. By excitation with sub-10-fs pulses resonant with the 0–0 S0 ? S2 transition, we observe rapid loss of stimulated emission from the bright excited state S2, followed by population of the hot S1 state within 150 fs. Vibrational cooling of S1 t...
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