Solvent and temperature influence on the fluorescence spectrum of 6-amino-5-methyl-2,3-diphenylbenzo[b]furan

Vlahovici, A.; Ofenberg, H.; Cires, Lenuta; Pollet, Alain; Lablache‐Combier, A.

doi:10.1016/0022-2313(94)90032-9

Cited by 6 publications

(1 citation statement)

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“…This arises from the fact that the betaine dye is involved in specific interactions with H-bond donor solvents [39]. Thus, correlations of solvent-dependent properties (positions and intensities of the absorption and emission bands) with the E T (30) parameter often follow two distinct lines, one for aprotic and another for protic solvents [43][44][45][46] (Figure 4.5).…”

Section: Solvatochromic Analysismentioning

confidence: 99%

Solute–Solvent Hydrogen Bond Formation in the Excited State. Experimental and Theoretical Evidence

Matei

Ionescu

Hillebrand

2010

Hydrogen Bonding and Transfer in the Excited State

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Hydrogen bonds (H-bonds) are of great importance in biological systems, as they are responsible for the secondary structure of proteins and nucleic acids and are also involved in the mechanisms of enzyme catalysis. Supramolecular chemistry makes use of H-bonds in building up novel compounds of various architectures.The identification of these interactions and the analysis of their influence on the photophysical properties are also important in designing new fluorophores for different applications, the processes involved being rather complex in nature and often only partially understood.The main feature reflecting H-bond interaction in both the ground and excited states is the solvatochromic effect on the absorption and fluorescence spectra. This implies that changes in the solvent nature or composition produce shifts in the position, shape and intensity of the spectral bands. The source of solvatochromic shifts is the different solvation of the ground and excited states: depending on the relative stabilization of these states by solvents, bathochromic (positive)or hypsochromic (negative)shifts of the maximum of the band can be observed experimentally. Thus, such changes are indicative of the interactions occurring between the solute and the solvent in its immediate vicinity. The solute-solvent interactions are classified into:1. non-specific interactions caused by polarity/polarizability effects; 2. specific interactions, such as H-bonds.

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