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We report herein the synthesis and photophysical studies on a new multicomponent chemosensor dyad comprising two fluorescing units, dansylamide (DANS) and nitrobenzoxadiazole (NBD). The system has been developed to investigate receptor-analyte binding interactions in the presence of both cations and anions in a single molecular system. A dimethyl amino (in(More)
In the present work an attempt to estimate population mean on the current occasion using two-phase successive (rotation) sampling on two occasions has been made. Two-phase ratio, regression and regression-type estimators for estimating the population mean on current (second) occasion have been proposed. Optimum replacement policies of the proposed(More)
Two fluorescent molecules, 4-aminophthalimide (AP) and 4-(N,N-dimethyl)amino-N-methylphthalimide (DMP) have been used as the building blocks to fabricate fluorescent organic nano particles. DMP, the analogue of AP, has been synthesized by substituting all the amine hydrogens of AP with methyl groups to get an idea about the effect of intermolecular hydrogen(More)
With the aim to understand the role of the ionic constituents of ionic liquids (ILs) in their structural organization, resonance energy transfer (RET) studies between ionic liquids (donor) and rhodamine 6G (acceptor) have been investigated. RET studies have been exploited for the present investigation due to the fact that the said process is extremely(More)
The rotational diffusion of two organic solutes, 4-(azitidine-1-yl)-7-nitrobenzo[1,2,5]oxadi-azole (ANBD) and 7-nitrobenzo[1,2,5]oxadiazole-4-amine (HNBD), has been examined in 1-ethyl-3-methylimidazolium alkyl sulfate (alkyl = ethyl, hexyl and octyl) ionic liquids with the aim of understanding intermolecular interactions among solute and solvent molecules.(More)
Analysis of time-resolved fluorescence anisotropy data in light of the Stokes-Einstein-Debye hydrodynamic description reveals significant decoupling of rotational motion of the solute and the viscosity of the medium for a hydroxyl-functionalized ionic liquid (IL). This behavior and NMR experiments indicate that the hydroxyl-functionalized IL is more(More)
Aggregation behavior of a series of neat 1-ethyl 3-methylimidazolium alkyl sulfate (alkyl = ethyl, butyl, hexyl, and octyl) ionic liquids has been investigated through combined time-resolved fluorescence spectroscopy, 1-D and 2-D NMR spectroscopy, and fluorescence correlation spectroscopy (FCS). Interestingly, experimentally measured rotational relaxation(More)
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