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Influence of heterogeneity of confined water on photophysical behavior of acridine with amines: a time-resolved fluorescence and laser flash photolysis study.
J Phys Chem A. 2011 Jan 20; 115(2):128-35.JP

Abstract

The photophysical behavior of acridine (Acr) shows facilitated water-assisted protonation equilibrium between its deprotonted (Acr* ∼ 10 ns) and protonated forms (AcrH(+*) ∼ 28 ns) within confined region of ordered water molecules inside AOT/H(2)O/n-heptane reverse micelles (RMs). The time-resolved-area-normalized-emission spectra confirm both Acr* and AcrH(+*), while time-resolved-emission spectra depict time evolution between them. Quenching of AcrH(+*) with N,N-dimethylaniline (DMA) is a purely diffusion-controlled bimolecular quenching with linear Stern-Volmer (S-V) plot, while nonlinearity arises with triethylamine (TEA) that forms ground state complex with AcrH(+) (AcrH(+)··H(2)O··TEA) indicating both static and dynamic quenching. Transient intermediates, DMA(•+) and AcrH(•) infer photoinduced electron transfer from DMA to Acr, while those from AcrH(+)··H(2)O··TEA complex suggest water mediated excited-state proton transfer (ESPT) between AcrH(+) and TEA. The ESPT becomes faster in larger RMs due to enhanced mobility of hydronium ions in AcrH(+)··H(2)O··TEA, which reduces in smaller RMs as water becomes much more constrained owing to stronger complexation by excess confinement.

Authors+Show Affiliations

Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21155585

Citation

Sarangi, Manas Kumar, et al. "Influence of Heterogeneity of Confined Water On Photophysical Behavior of Acridine With Amines: a Time-resolved Fluorescence and Laser Flash Photolysis Study." The Journal of Physical Chemistry. A, vol. 115, no. 2, 2011, pp. 128-35.
Sarangi MK, Dey D, Basu S. Influence of heterogeneity of confined water on photophysical behavior of acridine with amines: a time-resolved fluorescence and laser flash photolysis study. J Phys Chem A. 2011;115(2):128-35.
Sarangi, M. K., Dey, D., & Basu, S. (2011). Influence of heterogeneity of confined water on photophysical behavior of acridine with amines: a time-resolved fluorescence and laser flash photolysis study. The Journal of Physical Chemistry. A, 115(2), 128-35. https://doi.org/10.1021/jp107610k
Sarangi MK, Dey D, Basu S. Influence of Heterogeneity of Confined Water On Photophysical Behavior of Acridine With Amines: a Time-resolved Fluorescence and Laser Flash Photolysis Study. J Phys Chem A. 2011 Jan 20;115(2):128-35. PubMed PMID: 21155585.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of heterogeneity of confined water on photophysical behavior of acridine with amines: a time-resolved fluorescence and laser flash photolysis study. AU - Sarangi,Manas Kumar, AU - Dey,Debarati, AU - Basu,Samita, Y1 - 2010/12/14/ PY - 2010/12/16/entrez PY - 2010/12/16/pubmed PY - 2010/12/16/medline SP - 128 EP - 35 JF - The journal of physical chemistry. A JO - J Phys Chem A VL - 115 IS - 2 N2 - The photophysical behavior of acridine (Acr) shows facilitated water-assisted protonation equilibrium between its deprotonted (Acr* ∼ 10 ns) and protonated forms (AcrH(+*) ∼ 28 ns) within confined region of ordered water molecules inside AOT/H(2)O/n-heptane reverse micelles (RMs). The time-resolved-area-normalized-emission spectra confirm both Acr* and AcrH(+*), while time-resolved-emission spectra depict time evolution between them. Quenching of AcrH(+*) with N,N-dimethylaniline (DMA) is a purely diffusion-controlled bimolecular quenching with linear Stern-Volmer (S-V) plot, while nonlinearity arises with triethylamine (TEA) that forms ground state complex with AcrH(+) (AcrH(+)··H(2)O··TEA) indicating both static and dynamic quenching. Transient intermediates, DMA(•+) and AcrH(•) infer photoinduced electron transfer from DMA to Acr, while those from AcrH(+)··H(2)O··TEA complex suggest water mediated excited-state proton transfer (ESPT) between AcrH(+) and TEA. The ESPT becomes faster in larger RMs due to enhanced mobility of hydronium ions in AcrH(+)··H(2)O··TEA, which reduces in smaller RMs as water becomes much more constrained owing to stronger complexation by excess confinement. SN - 1520-5215 UR - https://www.unboundmedicine.com/medline/citation/21155585/Influence_of_heterogeneity_of_confined_water_on_photophysical_behavior_of_acridine_with_amines:_a_time_resolved_fluorescence_and_laser_flash_photolysis_study_ L2 - https://doi.org/10.1021/jp107610k DB - PRIME DP - Unbound Medicine ER -
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