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Solvatochromic properties of a new isocyanonaphthalene based fluorophore

Paper ID Volume ID Publish Year Pages File Format Full-Text
27402 44020 2013 9 PDF Available
Title
Solvatochromic properties of a new isocyanonaphthalene based fluorophore
Abstract

•A new isocyanide containing naphthalene based fluorophore was prepared.•The molecule showed positive solvatochromic effects.•The optical properties were studied by steady-state and time dependent fluorescence spectroscopy.•Lippert–Mataga and Kamlet–Taft equations were used to describe the solvatochromic properties.•The molecule showed preferential solvatation in THF and can be used for cmc determination.

The photophysical properties of a new naphthalene based fluorophore, namely the 1-amino-5-isocyanonaphthalene (ICAN) investigated by steady-state and time-resolved fluorescence methods are reported. The molecule showed positive solvatochromic properties, that is a more than Δv¯=4800 cm−1 red-shift of the emission maximum was observed (from 409 nm in hexane to 513 nm in water). The fluorescence quantum efficiency was found to decrease with increasing solvent polarity, from an excellent ΦF = 0.95 in 1,4-dioxane to ΦF = 0.04 in water. The Kamlet–Taft theory turned out to give the most appropriate description of the solvatochromic properties of the ICAN in various solvents including both protic and non-protic solvents. By carrying out experiments in cyclohexane/tetrahydrofuran binary mixtures of different compositions, evidence was found for the preferential solvation of ICAN. Based on laser light flash photometry measurements the radiative decay rate of ICAN was determined for six different solvents of largely different polarity. The decay rates show only minor solvent dependence and the life-times of the excited states are in the order of 10 ns which are in good agreement with the calculated values. The practical applicability of ICAN was demonstrated by determining the critical micelle concentration of sodium laurylsulfate in water.

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Keywords
Fluorescence; Solvent-dependence; Kamlet–Taft equation; Stokes-shift; Preferential solvation
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Solvatochromic properties of a new isocyanonaphthalene based fluorophore
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 270, 15 October 2013, Pages 19–27
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us