Intermolecular interactions in water + acetonitrile mixtures : Evidence from the composition variation of solvent polarity parameters

1981 ◽  
Vol 34 (5) ◽  
pp. 943 ◽  
Author(s):  
S Balakrishnan ◽  
AJ Easteal
Keyword(s):  
Intermolecular Interactions ◽  
Structural Model ◽  
Solvent Polarity ◽  
Electrolyte Mixtures ◽  
Composition Variation ◽  
Polarity Parameter ◽  
Polarity Parameters

The dependence on composition of the polarity of H2O+MeCN mixtures has been determined from measurements of the empirical solvent polarity parameter ET. ET has been found to vary with composition in a similar fashion to that which has been reported previously for most other H2O+non-electrolyte mixtures for which ET data are available. The variation of ET with composition is interpreted in terms of the Naberukhin-Rogov structural model for H2O+nonelectrolyte mixtures.

Solvent Polarity Studies of the Water+t-Butyl Alcohol and Water+t-Butylamine Binary Systems With the Solvatochromic Dyes Nile Red and Pyridinium-N-phenoxide Betaine, Refractometry and Permittivity Measurements

1994 ◽  
Vol 47 (9) ◽  
pp. 1771 ◽  
Author(s):  
PK Kipkemboi ◽  
AJ Easteal
Keyword(s):  
Binary Systems ◽  
Hydrophobic Interactions ◽  
Nile Red ◽  
Solvent Polarity ◽  
Butyl Alcohol ◽  
Linear Functions ◽  
Non Linear ◽  
Organic Cosolvent ◽  
Two Parameters ◽  
Polarity Parameters

The empirical solvent polarity parameters ENR and ET for the solvatochromic compounds Nile Red (1) and pyridinium-N-phenoxide betaine (2), respectively, have been determined as a function of composition for water+t -butyl alcohol and water+t-butylamine binary mixtures, over the whole composition range at 298 K. For both systems the two parameters vary with composition in a strongly non-linear fashion, and the polarity of the mixture decreases with increasing proportion of the organic cosolvent. The non-linear variation of the polarity parameters is attributed to water-cosolvent hydrophobic interactions at low cosolvent contents, and hydrogen-bonding interactions at higher cosolvent contents. Permittivity and refractive index have also been measured at 298 K for both systems, and both properties are strongly non-linear functions of composition.

scholarly journals Synthesis photophysical studies of some furfurylnitrones: high-ly selective chemosensors for Zn2+ and DFT studies

2018 ◽  
Vol 6 (1) ◽  
pp. 37 ◽  
Author(s):  
Ezhumalai Dhineshkumar ◽  
Mathivanan Iyappan ◽  
Rajendran Ganapathi ◽  
Chinnadurai Anbuselvan
Keyword(s):  
Molecular Structure ◽  
Solvent Polarity ◽  
Zinc Ion ◽  
Dft Studies ◽  
Fluorescence Sensing ◽  
1H And 13C Nmr ◽  
Ft Ir ◽  
Photophysical Studies ◽  
Polarity Parameters ◽  
Electronic Ground

New aldonitrones(1-4) were synthesized and characterized by UV-vis, fluorescence, FT-IR, 1H and 13C NMR spectral analyses. The absorption and fluorescence sensing spectra of the compounds were precise in different polarity of solvent. The solvent polarity parameters have been used to propose a quantitative approach towards the reliable stability of the electronic ground and excited state species. Photochemical behaviors of the compounds were analyzed by applying multi-linear correlation methods. The characterized compounds 1-4 show a chemosensing detection of zinc ion in aqueous solution. Besides, the fluorescence spectroscopic responses were reversible when the Zn2+chelating reagentEDTANa2.The phenomenon proves that these compounds to show a sensitivity “on-off” sensor for Zn2+.Further, to recognize the molecular structure, electronic and optical properties and DFT calculations of the molecules were formed.

Determination of the empirical solvent polarity parameter ET(30) by multivariate image analysis

2013 ◽  
Vol 5 (4) ◽  
pp. 891-896 ◽  
Author(s):  
Fatemeh Shakerizadeh-Shirazi ◽  
Bahram Hemmateenejad ◽  
Abdol Mohammad Mehranpour
Keyword(s):  
Image Analysis ◽  
Solvent Polarity ◽  
Multivariate Image Analysis ◽  
Polarity Parameter ◽  
Multivariate Image

scholarly journals A fluorescent paramagnetic Mn metal–organic framework based on semi-rigid pyrene tetracarboxylic acid: sensing of solvent polarity and explosive nitroaromatics

IUCrJ ◽  
2015 ◽  
Vol 2 (5) ◽  
pp. 552-562 ◽  
Author(s):  
Alankriti Bajpai ◽  
Arindam Mukhopadhyay ◽  
Manchugondanahalli Shivakumar Krishna ◽  
Savitha Govardhan ◽  
Jarugu Narasimha Moorthy
Keyword(s):  
Metal Ions ◽  
Metal Organic Framework ◽  
Energy Charge ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Accessible Volume ◽  
Polarity Parameter ◽  
Metal Organic ◽  
Paramagnetic Metal ◽  
Organic Framework

An Mn metal–organic framework (Mn-MOF), Mn-L, based on a pyrene-tetraacid linker (H4L), displays a respectable fluorescence quantum yield of 8.3% in spite of the presence of the paramagnetic metal ions, due presumably to fixation of the metal ions in geometries that do not allow complete energy/charge-transfer quenching. Remarkably, the porous Mn-LMOF with ∼25% solvent-accessible volume exhibits a heretofore unprecedented solvent-dependent fluorescence emission maximum, permitting its use as a probe of solvent polarity; the emission maxima in different solvents correlate excellently with Reichardt's solvent polarity parameter (ETN). Further, the applicability of Mn-Lto the sensing of nitroaromaticsviafluorescence quenching is demonstrated; the detection limit for TNT is shown to be 125 p.p.m. The results bring out the fact that MOFs based on paramagnetic metal ions can indeed find application when the quenching mechanisms are attenuated by certain geometries of the organic linkers of the MOF.

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