Photophysical properties of 3-acetyl-4-oxo-6,7-dihydro-12H-indolo[2,3-a]quinolizine (AODIQ), a bioactive molecule, has been investigated in well-characterized, monodispersed biomimicking nanocavities formed by sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in heptane using steady-state and picosecond time resolved fluorescence and fluorescence anisotropy. The emission behavior of AODIQ is very much dependent upon the water/surfactant mole ratio (W), i.e., on the water pool size of the reverse micellar core. AODIQ exhibits a sharp decrease in fluorescence anisotropy with increasing W, implying that the overall motional restriction experienced by the molecule is decreased with increased hydration. Some of the depth-dependent relevant fluorescence parameters, namely, fluorescence maxima and fluorescence anisotropy (r), have been monitored for exploiting the distribution and microenvironment around the probe in the reverse micelles. Fluorescence spectral position and fluorescence quenching studies suggest that the probe does not penetrate into the reverse micellar core; rather it binds at the interfacial region. Quantitaive estimates of the micropolarity and microviscosity at the binding sites of the probe molecule have been determined as a function of W.
The low temperature Ñash photolysis and spectral studies of Methyl Red M2-[4-(dimethylamino)phenylazo]benzoic acidN show the presence of four conformers in equilibrium. Besides the common cis and trans conformers, there are two types of quinoid zwitterions. The absorption intensity at room temperature is mostly contributed by quinoid zwitterions. In methyl cyclohexane the absorption maximum of the trans conformer is at 420 nm and those of two zwitterions are at 475 and 455 nm, respectively. From Ñash excitation spectra, the cis conformer appears to show an absorption maximum at 350 nm. The distribution of the species changes on Ñash excitation and the normal distribution is restored via one or more equilibrium steps as indicated by the negative activation energy of the process.
The supramolecular hydrogel of a simple organic salt derived from a primary amine and a mono-sulfonic acid displayed a proton conductivity of 1.2 × 10−4 S cm−1.
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