Interface-specific hydrogen (H)-bonding network of water directly controls the energy transfer and chemical reaction pathway at many charged aqueous interfaces, yet to characterize these bonded layer structures remains a challenge. We now develop sum-frequency spectroscopic scheme with varying photon momenta as an all-optic solution for retrieving vibrational spectra ion diffuse and, hence, microscopic structural charging information about interface. Application method model surfactant-water...

Hydrogen-bonded structure and relaxation dynamics of water entrapped inside reverse micelles (RMs) composed surfactants with different charged head groups: sodium bis(2-ethylhexyl) sulfosuccinate (AOT) (anionic), didodecyldimethylammonium bromide (DDAB) (cationic) Igepal CO-520 (Igepal) (nonionic) in cyclohexane (Cy) have been studied as a function hydration (defined by ). Sub-diffusive slow (sub-ns) has measured the time resolved fluorescence spectroscopy (TRFS) technique using two...

Hydration of metal ions is critical to their adsorption, complexation, and discharge but remained elusive due counterion interference. We introduce Raman difference spectroscopy with simultaneous curve fitting (RD-SCF) analysis quantitatively retrieve the counterion-free OH stretch spectra water in hydration shell various such as Li+, Mg2+, Ca2+, Sr2+, Ba2+, La3+, Gd3+ Dy3+, Lu3+ well that a proton (H+). The RD-SCF-extracted show "extremely weakly" (OH ∼ 3600 cm–1) "strongly" (∼3300...

In this contribution we have tried to investigate whether the mechanical properties of reverse micellar (RM) interface dictate physical entrapped water molecules in RM waterpool. We choose AOT/Igepal-520/cyclohexane (Cy) mixed as a model system which exhibits synergistic solubilization behavior function interfacial stoichiometry. Such phenomenon associates systematic modification curvature. Dynamic light scattering (DLS) studies reveal linear increase droplet size and aggregation number RMs...

Dinuclear copper(II) complexes with formula [Cu2(L)2(N3)2] (1) and [Cu2(L)2(NCS)2] (2) HL = (1-[(3-methyl-pyridine-2-ylimino)-methyl]-naphthalen-2-ol) were synthesized by controlling the molar ratio of Cu(OAC)2·6H2O, HL, sodium azide ammonium thiocyanate (2). The end on bridges appear exclusively in to copper complexes. electron transfer mechanism is examined cyclic voltammetry indicating are Cu(II)/Cu(I) couple. interactions towards bovine serum albumin (BSA) help absorption fluorescence...

Micelle-assisted "deintercalation" of intercalated drug/mutagen molecules from DNA is a well-established phenomenon; however, the driving energy cost for such process still not properly understood. In present contribution, we have estimated various energetic parameters SDS micelle-assisted deintercalation model intercalator phenosafranine (PSF) using isothermal titration calorimetry (ITC) measurement. Both steady-state and picosecond-resolved fluorescence measurements provide strong evidence...

Hydration of ions plays a crucial role in interionic interactions and associated processes aqueous media, but selective probing the hydration shell water is nontrivial. Here, we introduce Raman difference with simultaneous curve fitting (RD-SCF) analysis to extract OH-stretch spectrum water, not only for fully hydrated (Mg2+, La3+, Cl–) also ion pairs. RD-SCF analyses diluted MgCl2 (0.18 M) LaCl3 (0.12 solutions relative NaCl equivalent Cl– concentrations provide spectra shells Mg2+ La3+...

A combined experimental (mid- and far-infrared FTIR spectroscopy THz time domain (TTDS) (0.3-1.6 THz)) molecular dynamics (MD) simulation technique are used to understand the evolution of structure water in its binary mixture with 1,2-dimethoxy ethane (DME) over entire concentration range. The cooperative hydrogen bond obtained from Debye relaxation TTDS data reveals a non-monotonous behaviour which collective is much faster low Xw region (where mole fraction mixture), whereas ∼ 0.8 region,...

In this contribution, we have examined a composition dependent self aggregated structural modification of catanionic mixture the surface active ionic liquid (IL) 1-butyl-3-methylimidazolium octyl sulphate and cationic gemini surfactant (14-5-14) in aqueous medium.

In this study, we have explored the slow (of order of several hundreds picoseconds) relaxation dynamics water associated with hydration shell a biocompatible polymer, hydroxypropyl cellulose (HPC)-water mixture as function HPC concentration using time-resolved fluorescence spectroscopy. The slows down progressive increase in content indicating restriction pathway molecules specially beyond 20% wherein an isotropic to liquid crystalline cholesteric microscopic phase separation sets in....

We have measured the hydrogen bonded structure and sub-ns relaxation dynamics of water molecules encapsulated in DDAB-cyclohexane (Cy)-water reverse micellar (RM) water-pool dependent on concentration (w(0) = [water]/[DDAB]) temperatures. The interfacial film DDAB-Cy undergoes significant alteration upon addition as microscopic phase changes from cylindrical aggregates to discrete droplets which is contrast conventional RM systems. FTIR spectroscopy mid-infrared (MIR) far-infrared (FIR)...

Enhanced catalytic activity (super activity) of enzymes in the presence surfactants is key importance "micellar enzymology"; such super not very trivial, it highly system specific, and mechanism behind enhancement always well apprehended. We report α-chymotrypsin (CHT) on ala-ala-phe-7-amido-4-methylcoumarin (AMC) cationic different hydrophobic chain lengths: dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium (CTAB) octadecyltrimethylammonium (OTAB). It observed that comparison...

The photophysical properties of luminescent tetra-coordinated cadmium (II) complex formulated as [Cd(L)Cl],HL = (1-[(3-methyl-pyridine-2-ylimino)-methyl]-naphthalen-2-ol) were synthesized and characterized by analytical spectroscopic methods. density function theory calculations are used to investigate the electronic structures ligand its complex. interactions towards bovine serum albumin (BSA) human (HSA) investigated using absorption fluorescence techniques at pH 7.4. quenching constants,...

Polyethylene glycol (PEG), a water-soluble non-ionic polymer, finds diverse applications from Li-ion batteries to drug delivery. The effectiveness of PEG in these contexts hinges on water's behavior at PEG/water interfaces. Employing heterodyne-detected vibrational sum frequency generation and Raman spectroscopy along with novel analytical approach, termed difference simultaneous curve-fitting analysis, we observed that water exhibits both "hydrogen-up" "hydrogen-down" orientations...

Abstract Two series of zinc(II) complexes two Schiff bases (H2L1 and H2L2) formulated as [Zn(HL1/HL2)]ClO4 (1a 1b) [Zn(L1/L2)] (2a 2b), where H2L1 = 1,8-bis(salicylideneamino)-3,6-dithiaoctane H2L2 1,9-bis(salicylideneamino)-3,7-dithianonane, have been prepared isolated in pure form by changing the chemical environment. Elemental, spectral, other physicochemical results characterize complexes. A single crystal X-ray diffraction study confirms structure [Zn(HL1)]ClO4 (1a). In 1a, has a...

A series of neutral octahedral nickel(II) complexes 1,3-bis(2-pyridylmethylthio)propane (L) and pseudohalide (X), formulated as [NiII(L)X2] (where X = azide (1), cyanate (2), isothiocyanate (3)), was synthesized. The were characterized by physico-chemical spectroscopic methods, 1 3 also single-crystal X-ray diffraction analyses. structural study shows nickel in a distorted geometry comprised the tetradentate NSSN ligand with trans pyridines monocoordinated pseudohalides cis positions. In...

Oxorhenium(V) complexes of β-diketonate systems have been synthesized and isolated in pure form. The red n-Bu4N[ReO(R1COCHCOR2)Cl3] (acac, R1=R2=CH3; bzac, R1=CH3 R2=C6H5; bzbz, R1=R2=C6H5) characterized by elemental analyses, spectroscopic other physico-chemical tools. One complex, n-Bu4N[ReO(bzbz)Cl3] (1c) has subjected to single-crystal X-ray analysis. In the structure anion, metal a six-coordinate octahedral environment which bidentate β-diketone ligand is cis trans terminal oxygen.