Aggregation phenomena in xanthene dyes

Electronic absorption, fluorescence and fluorescence excitation spectra, and vibrational Raman spectra of selected homogeneous solution phase, free-base tetraaryl-substituted porphyrinsspecifically, tetraphenylporphine (TPPH2), tetra(p-pyridyl)porphine (TPyPH2), tetra(p-N-methylpyridyl)porphine (TMPyPH2), tetra(p-carboxylphenyl)porphine (TCPPH2), and tetra(p-sulfonatophenyl)porphine (TSPPH2)as well as their protonated diacids are acquired and analyzed. N-protonation induces a structural change in which the free-base porphyrin is converted from a configuration in which the aryl moiety is twisted relative to the macrocycle plane to one in which it is nearly coplanar, thus promoting aggregation. However, spectroscopic investigations of the tetraaryl-substituted porphyrins reveal that coplanarity, although necessary, is insufficient for aggregation to occur. Also required is that the doubly protonated porphyrin have a net zero charge, i.e., be zwitterionic. The structural alignments of monomers in tetraaryl-s...

Aggregation of Tetraaryl-Substituted Porphyrins in Homogeneous Solution

Microscale electrodialysis: Concentration profiling and vortex visualization

Fourier transform spectra of overtone bands of HCN from 5400 to 15100 cm−1

Fluorescence lifetimes and quantum yields of ten rhodamine derivatives: Structural effect on emission mechanism in different solvents

The self-association of Rhodamine 6G in ethanol has been studied by determining the dimerization and trimerization constants at different temperatures. The excitonic interpretation of the absorption spectra suggests a linear structure for the aggregates. The nature of the bonding has been also studied.

Excitonic treatment and bonding of aggregates of Rhodamine 6G in ethanol

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Excitonic treatment and bonding of aggregates of Rhodamine 6G in ethanol