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7638944 
Journal Article 
Solvatochromic Absorbance and Fluorescence Probe Behavior within Ionic Liquid plus gamma-Butyrolactone Mixture 
Islam, MdR; Shakya, S; Selim, A; Alam, MdS; Ali, M; , 
2019 
Yes 
Journal of Chemical and Engineering Data
ISSN: 0021-9568
EISSN: 1520-5134 
AMER CHEMICAL SOC 
WASHINGTON 
64 
9 
4169-4180 
English 
WOS:000486361300049 
The co-solvent modified ionic liquid (IL) systems offer favorable physicochemical properties, which render them as suitable solvents for several technological applications. Therefore, it is an utmost need to achieve a full understanding of such systems before their further applications. Here, solvation properties of 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim] [BF4], and gamma-butyrolactone (GBL) mixture, which is an important binary mixture for several electrochemical applications, are explored by multiprobe spectroscopic and theoretical studies. The Reichardt polarity parameter (E-T(N)) and Kamlet-Taft parameter (alpha, beta, and pi*) are determined with several absorbance probes. The unusual synergism in the probe's response is observed within the [bmim] [BF4] and gamma-butyrolactone (GBL) mixture. Such type of anomalous behavior is also observed in the response of the following fluorescence probes: 8-anilino-1-naphthalene sulfonate (ANS), 6-propionyl-2-(dimethylamino)naphthalene (PRODAN), and pyrene (Py). This unusual behavior is explained by considering the role of solvent-solvent interactions between IL and GBL molecule in the cybotactic region of probes. The occurrence of solvent-solvent interaction and other possible interactions within the binary system are also explored by Fourier transform infrared, dynamic viscosity, and density studies. Further, the preferential solvation model and density functional theory also provide the useful evidence of solvent-solvent interactions within the binary mixture.