Preferential solvation of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures

Józefowicz, Marek; Heldt, J.

doi:10.1016/s0301-0104(03)00379-3

Cited by 41 publications

(18 citation statements)

References 21 publications

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“…In practical studies, the biological membranes are often replaced by model systems, such as phospholipid vesicles forming single or multiple bilayers, which are dispersed in aqueous medium. In such solvent mixtures, the radiation of fluorescent probe molecules often differs from that in neat solvents [15,16]. Thus the absorption and emission spectra result from ensembles in different environments.…”

Section: Introductionmentioning

confidence: 99%

Influence of DPPC Liposome Concentration on the Fluorescence Properties of PRODAN and LAURDAN

Kozyra¹,

Gondek²,

Kwiek³

et al. 2004

Zeitschrift Für Naturforschung A

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Fluorescence spectral features of PRODAN and LAURDAN in phospholipid vesicles of different phase states were investigated. The results indicate that in the liquid crystalline phase the dominant emission results from the charge transfer (CT) excited state, whereas in the gel state of the membrane the emission from the locally excited (LE) state dominates. The fluorescence time studies point out that there are two radiation modes, one starting from only vibrationally relaxed excited states S 1 (LE) ν ((S 1 (CT) ν ) and the other from a totally thermally equilibrated state S 1 (LE) EQ (S 1 (CT) EQ ). In accordance with the obtained decay time dependencies, the fluorescence emission from total nonequilibrated excited states consists of a dominant or minor radiation process in the LE or CT band emission.

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Section: Introductionmentioning

confidence: 99%

Influence of DPPC Liposome Concentration on the Fluorescence Properties of PRODAN and LAURDAN

Kozyra¹,

Gondek²,

Kwiek³

et al. 2004

Zeitschrift Für Naturforschung A

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“…A good example of their applications is the study of fluorenone and 4-hydroxyfluorenone using two mixtures of different solvents, non-polar-polar aprotic (CHX-THF) and non-polar-protic (CHX-EtOH). The last system allows the detection of possible H-bonding effects [136,137].…”

Section: Selection Of Solventsmentioning

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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“…The primary condition for a molecule to act as an efficient dye is that it must undergo redistribution of electron density on photoexcitation. Examples of these kinds of probe are 6-propionyl-2-(N, N-dimethylamino)naphthalene (PRODAN) [60], aminonaphthalimide [61], 1-anilino-naphthalene-8-sulfonate (ANS), fluorenones [62], hemicyanine dye, etc. These compounds contain a free electron pair capable of interacting with hydrogen bond donor (protic) solvents or substrates.…”

Section: Diazinesmentioning

confidence: 99%

Hydrogen Bonding on Photoexcitation

Dey

Sarangi

Basu

2010

Hydrogen Bonding and Transfer in the Excited State

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Preferential solvation of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures

Cited by 41 publications

References 21 publications

Influence of DPPC Liposome Concentration on the Fluorescence Properties of PRODAN and LAURDAN

Influence of DPPC Liposome Concentration on the Fluorescence Properties of PRODAN and LAURDAN

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

Hydrogen Bonding on Photoexcitation

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