Excess molar volumes and viscosities of binary mixtures of tetraethylene glycol dimethyl ether (tetraglyme) with chloroalkanes at 298.15 K

Rotational Diffusion Dynamics of Fluorescein Derivatives in Binary Mixtures of Solvents: An Experimental and Computational Study

With a view to understand the nature of solute solvent interactions, rotational reorientation times (τ_r) of three medium sized dipolar laser dyes viz., dichlorofluorescein (DCF), sodium fluorescein (SF) and kiton red (KR) in two binary mixtures namely, aqueous-DMSO and aqueous-1-propanol have been determined employing steady state fluorescence depolarization technique. The experimental results are analyzed in the light of SED hydrodynamic and of Gierer and Wirtz (GW) and Dote, Kivelson and Schwartz (DKS) quasihydrodynamic models. Rotational reorientation times (τ_r) are plotted as function of viscosity (η) on the binary solvent mixtures. An interesting hook shaped profile is observed in both the binary mixtures of solvents that is likely to shed light on solute-solvent interactions. Further, theoretical study has been carried out using Gaussian 09 software. The optimized geometry, HOMO-LUMO, energy gap and molecular electron potential map (MEPM) were extracted from DFT/B3LYP 6-311g(d) basis set. The hyper conjugation or intra-molecular delocalization was estimated from NBO analysis. Strong interactions were observed between nO₃₃→σ^*C₃₁, πN₃₈→σ^*C₁₂ and πO₃₂→π^*(C₃₁- O₃₃) with E(2) energies of 203.58, 121.89 and 39.92 kJ/mol for SF, KR and DCF.

Solubility of sulfur dioxide in tetraglyme-NH4SCN ionic liquid: high absorption efficiency

Simple prepared tetraglyme-NH₄SCN ionic liquid is used to absorb sulfur dioxide efficiently and regenerate.

Highly efficient sulfur dioxide capture by glyme–lithium salt ionic liquids

A series of ionic liquids can be simply prepared by mixing glymes and Li salts. The formed quasi-aza-crown cations of glymes and Li ion exhibit an efficient and excellent reversible absorption of sulfur dioxide.

Externally sensitized deprotection of PPG-masked carbonyls as a spatial proximity probe in photoamplified detection of binding events

Externally sensitized electron-transfer fragmentation in dithiane PPG (photoremovable protecting group)-protected carbonyls is adopted for detection and amplification of molecular recognition events. The new methodology allows for detection of as low as 50 attomoles of avidin utilizing an imager based on a low sensitivity mass-produced consumer CCD camera. Numeric modelling is carried out to demonstrate the intrinsic limitations of 2D amplification on surfaces and the advantages of unconstrained amplification in a compartmentalized volume of spatially addressable 3D solutions.