Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents
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ORIGINAL ARTICLE
Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents Dalal M. AL-Aqmar 1,2 & Hamdan A. S. Al-Shamiri 3,4 & Jamal M. AL-Shareef 5,6 & Maram T. H. Abou Kana 1 Hamed M. Kandel 1
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Received: 12 May 2020 / Accepted: 23 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract IR-792 as near IR (NIR) laser dye was dissolved with different concentrations in two types of ionic liquids (ILs) of different anion and cation, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI) & 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM BF4), as the benign green solvent and in methanol (MeOH) as a standard solvent. The behavior of fluorescence of IR-792 dye was studied. The fluorescence of IR-792 dissolved in the ILs was heavily compared to organic solvent. Some photo-physical parameters of IR-792 were calculated. Mainly, IR-792 had a very low quantum yield of fluorescence with high intersystem crossing rate & fluorescence lifetime in picosecond range. Optical absorption and behavior of fluorescence for the rigorously the purified imidazolium ILs in the neat condition and effect of IR-792 on their fluorescence have been examined. The emission behavior of IR-792 in green solvents was independent upon the wavelength of excitation, while the emission behavior of green solvents dependent upon the wavelength of excitation whether in pure state or with NIR laser dye. At most, the intensity of fluorescence of ILs is dependent upon dye concentration. Keywords IR792-laser dye . EMIM TFSI . BMIM BF4 . Excitation wavelength . Green solvent
Introduction Increasing of chemical and biological applications of nearinfrared (NIR) laser dyes has driven the growing attention of works in recent decades. Till now, there were quite fewer reports of laser dyes in near-infrared (700–1000 nm) compared with other laser dyes, which cover mainly visible wavelength range, and many of these reports were not recent
* Maram T. H. Abou Kana [email protected] 1
National Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypt
2
Physics Department, Ibb University, Ibb, Yemen
3
Physics Department, Faculty of Science, Bisha University, P.O. Box 551, Bisha 61922, Saudi Arabia
4
Physics Department, Faculty of Applied Science, Taiz University, Taiz, Yemen
5
Physics Department, Sana’a University, Sana’a, Yemen
6
Biophysics Department, Faculty of Science, Cairo University, Cairo, Egypt
enough. IR-792 is categorized as Near-Infrared Fluorescence (NIRF) samples, which have shown significant potential in many applications that result in their firstly low high molar absorption coefficients, toxicity, broad absorption band, and versatility [1]. NIR dye has very high polarizability over the polymethine group in the ground state, which is resulting from strong forces of dispersion between two molecules of laser dye in solution [2]. These dispersion forces control in the formation of the extended molecules in solutions. Biological matter aut
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