01783nas a2200169   4500008004100000022001400041245006400055210006300119260011000182300001200292490000700304520114000311100002201451700002601473700001601499856009801515       2015                        eng d  a1463-907600aSolvent-mediated molar conductivity of protic ionic liquids0 aSolventmediated molar conductivity of protic ionic liquids  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a475-4820 v173 a<p>The molar conductivity, A(m), of protic ionic liquids (PILs) in molecular solvents is measured at 298.15 K. The decrease in the A(m) values of PILs is observed with an increase in the concentration of PILs. The limiting molar conductivities, A(m)(0), were obtained for each PIL in different molecular solvents using a least squares method. The A(m)(0) data for PILs were correlated with the structural aspects of PILs and solvent properties. The polar protic solvents show poor ionic association as compared to the polar aprotic solvents, which is discussed on the basis of the hydrogen bond donating (HBD) ability of solvents and PILs. The alkyl chain substitution of anions plays a significant role in the ionic association of the PILs. The diffusion coefficient D-0 and the transport number t were determined, which were consistent with the A(m)(0) values of PILs in water. The A(m)(0) and D-0 values are dependent on the hydrodynamic radius of anions of these ionic liquids. The extent of ionic association for each PIL was discussed using temperature dependent A(m) data for aqueous PIL systems in terms of the Walden plot.</p>1 aThawarkar, Sachin1 aKhupse, Nageshwar, D.1 aKumar, Anil  uhttps://library.ncl.res.in/content/solvent-mediated-molar-conductivity-protic-ionic-liquids-002007nas a2200229   4500008004100000022001400041245014800055210006900203260007500272300001400347490000700361520110400368653002501472653002101497653003101518653001401549653001801563100002201581700002601603700001601629856013201645       2016                        eng d  a1439-423500aComparative investigation of the ionicity of aprotic and protic ionic liquids in molecular solvents by using conductometry and NMR spectroscopy0 aComparative investigation of the ionicity of aprotic and protic   aPOSTFACH 101161, 69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAPR  a1006-10170 v173 a<p>Electrical conductivity (sigma), viscosity (), and self-diffusion coefficient (D) measurements of binary mixtures of aprotic and protic imidazolium-based ionic liquids with water, dimethyl sulfoxide, and ethylene glycol were measured from 293.15 to 323.15K. The temperature dependence study reveals typical Arrhenius behavior. The ionicities of aprotic ionic liquids were observed to be higher than those of protic ionic liquids in these solvents. The aprotic ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate, [bmIm][BF4], displays 100% ionicity in both water and ethylene glycol. The protic ionic liquids in both water and ethylene glycol are classed as good ionic candidates, whereas in DMSO they are classed as having a poor ionic nature. The solvation dynamics of the ionic species of the ionic liquids are illustrated on the basis of the (HNMR)-H-1 chemical shifts of the ionic liquids. The self-diffusion coefficients D of the cation and anion of [HmIm][CH3COO] in D2O and in [D-6]DMSO are determined by using H-1 nuclei with pulsed field gradient spin-echo NMR spectroscopy.</p>10aconducting materials10aElectrochemistry10aelectrostatic interactions10aIon pairs10aionic liquids1 aThawarkar, Sachin1 aKhupse, Nageshwar, D.1 aKumar, Anil  uhttps://library.ncl.res.in/content/comparative-investigation-ionicity-aprotic-and-protic-ionic-liquids-molecular-solvents-using02383nas a2200157   4500008004100000245009200041210006900133260000800202300001600210490000700226520180500233100002202038700001902060700002602079856012002105       2017                        eng d00a Plasmonic behavior of ionic liquid stabilized gold nanoparticles in molecular solvents0 aPlasmonic behavior of ionic liquid stabilized gold nanoparticles  cNOV  a12989-129950 v413 aIn this paper, we have demonstrated the facile synthesis of stable gold nanoparticles (AuNPs) using imidazolium ionic liquids (ImILs) as a stabilizer as well as a surfactant and their surface plasmon resonance (SPR) in different molecular solvents with varying dielectric properties. The preparation of AuNPs capped with N,N'-dialkyl ImILs of different chain lengths (denoted as [C-4, C-n-im]Br, n = carbon number of the alkyl chain) has been investigated. With one long alkyl chain (n >= 14), these AuNPs could be stably dispersed in solution over a month. The amphiphilic nature of the imidazolium salt dictates the stability and dispersion of these AuNPs in organic or aqueous solvents. Alkyl chain lengths (n >= 14) and the amount of ImILs have insignificant effect on the size of AuNPs and they possess an average size of 5 nm. These ionic liquid stabilized AuNPs were exploited to examine their optical properties when exposed to various solvent systems by measuring the change in the SPR spectrum. It was seen that the position of the SPR band of AuNPs is greatly influenced by the solvents under consideration. The shift in the SPR absorption band is observed to be in the range of 520 nm to 605 nm for AuNP@[C-4,C-16-im]Br from nonpolar to highly polar solvents. The considerable discovery presented here is that the lambda(SPR) of the SPR shifts to the blue with the increase of carbon atom in the alcohol chain from methanol to 1-decanol. Also for polyethylene glycols (PEGs), the lambda(SPR) shifts to the blue with the increase in molecular weight from PEG 200 to PEG 600. In above both cases, the variation in SPR of AuNPs is observed according to the dielectric properties of the medium in addition to the steric factor of alcohols and PEGs during their interaction with AuNP surfaces.1 aThawarkar, Sachin1 aThombare, Balu1 aKhupse, Nageshwar, D.  uhttps://library.ncl.res.in/content/plasmonic-behavior-ionic-liquid-stabilized-gold-nanoparticles-molecular-solvents03153nas a2200193   4500008004100000245008500041210006900126260000900195300001400204490000700218520248400225100002202709700002302731700001902754700002502773700002002798700002502818856011602843       2019                        eng d00aIonic liquid-responsive phase transfer of gold nanoparticles: anionic metathesis0 aIonic liquidresponsive phase transfer of gold nanoparticles anio  cJULY  a9213-92180 v353 a<p>In this work, a fresh approach has been proposed for <span class="hitHilite">the</span> efficient <span class="hitHilite">transfer</span> <span class="hitHilite">of</span> <span class="hitHilite">gold</span> <span class="hitHilite">nanoparticles</span> (AuNPs) <span class="hitHilite">from</span> an aqueous to organic <span class="hitHilite">phase</span> by <span class="hitHilite">the</span> <span class="hitHilite">metathesis</span> reaction or anion exchange reaction. Here, we synthesized <span class="hitHilite">ionic</span> liquid 1-butyl 3-hexadecyl imidazolium bromide [C(4)C1(6I)m]-Br-stabilized AuNPs which exhibit excellent stability in solution. <span class="hitHilite">Transfer</span> <span class="hitHilite">of</span> Au@[C(4)C(16)Im]Br <span class="hitHilite">from</span> an aqueous to organic <span class="hitHilite">phase</span> was investigated by <span class="hitHilite">the</span> <span class="hitHilite">metathesis</span> reaction with different hydrophobic <span class="hitHilite">ionic</span> liquid-forming salts such as LiNTf2, LiClO4, and KPF6. <span class="hitHilite">The</span> <span class="hitHilite">anionic</span> exchange process in <span class="hitHilite">ionic</span> liquids at <span class="hitHilite">the</span> AuNP surface to make hydrophilic to hydrophobic AuNPs is demonstrated. It was found that hydrophobic <span class="hitHilite">ionic</span> liquids provide <span class="hitHilite">the</span> most effective <span class="hitHilite">transfer</span> <span class="hitHilite">of</span> AuNPs <span class="hitHilite">from</span> <span class="hitHilite">the</span> aqueous to organic <span class="hitHilite">phase</span>. Interestingly, we have noticed no change in color, size, and shape <span class="hitHilite">of</span> AuNPs for more than a month, indicating more efficient <span class="hitHilite">transfer</span> <span class="hitHilite">of</span> AuNPs in organic solvents, which remained stable for over a month. <span class="hitHilite">The</span> <span class="hitHilite">ionic</span> liquids with anions NTf2-, ClO4-, and PF6- make <span class="hitHilite">the</span> AuNP surface hydrophobic, indicating their good dispersibility in nonpolar solvents. Finally, these AuNPs exhibit excellent sensitivity toward <span class="hitHilite">the</span> refractive index <span class="hitHilite">of</span> organic solvents, which is correlated with <span class="hitHilite">the</span> surface plasmon resonance (SPR) lambda(SPR) bands.</p>
1 aThawarkar, Sachin1 aNirmale, Trupti, C1 aMore, Sahebrao1 aAmbekar, Jalindar, D1 aKale, Bharat, B1 aKhupse, Nageshwar, D  uhttps://library.ncl.res.in/content/ionic-liquid-responsive-phase-transfer-gold-nanoparticles-anionic-metathesis01751nas a2200229   4500008004100000022001400041245012000055210006900175260000800244300001200252490000700264520096000271653001901231653001701250653001301267653002701280653002201307100002201329700002601351700001601377856012801393       2020                        eng d  a0095-978200aBinary mixtures of aprotic and protic ionic liquids demonstrate synergistic polarity effect: an unusual observation0 aBinary mixtures of aprotic and protic ionic liquids demonstrate   cFEB  a210-2210 v493 a<p>In this communication, we demonstrate the solute-solvent and solvent-solvent interactions in the binary mixtures of two aprotic ionic liquids, namely 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, with the protic ionic liquid 1-methylimidazolium acetate. The synergistic effects as expressed by the solvatochromic parameter are noted. This observation is in contrast to the mixing of protic ionic liquids 1-methylpyrrolidium acetate and 4-methylmorpholine acetate with 1-methylimidazolium acetate, respectively. It appears that the synergistic effects in the binary mixtures of aprotic and protic ionic liquids are caused by the formation of hydrogen bonds, since cations are dominant H-bond donors while anions are dominant H-bond acceptors. Preferential solvation models are used to describe the solute-solvent interactions in the binary ionic liquid mixtures.</p>
10abinary mixture10aIonic liquid10apolarity10aPreferential solvation10asynergetic effect1 aThawarkar, Sachin1 aKhupse, Nageshwar, D.1 aKumar, Anil  uhttps://library.ncl.res.in/content/binary-mixtures-aprotic-and-protic-ionic-liquids-demonstrate-synergistic-polarity-effect02758nas a2200241   4500008004100000022001400041245014000055210006900195260000800264300001400272490000700286520189900293100002002192700002202212700002002234700001902254700001602273700003202289700002302321700002202344700002002366856013002386       2023                        eng d  a0020-166900aLead-free solid state mechanochemical synthesis of Cs2NaBi1-XFeXCl6 double perovskite: reduces band gap and enhances optical properties0 aLeadfree solid state mechanochemical synthesis of Cs2NaBi1XFeXCl  cMAR  a4861-48710 v623 a<p>
	Efficient and stable lead-free halide double perovskites (DPs) have attracted great attention for the future generation of electronic devices. Herein, we have developed a doping approach to incorporate Fe3+ ions into the Cs2NaBiCl6 crystal unit and reveal a crystallographic and optoelectronic study of the Cs2NaBi1-xFexCl6 double perovskite. We report a simple solid-state mechanochemical method that has a solvent-free, one-step, green chemistry approach for the synthesis of Cs2NaBi1-xFexCl6 phosphor. The analysis of powder X-ray diffraction (XRD) data determines the contraction of the lattice due to the incorporation of Fe3+ cations, and this effect is well supported by X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and solid-state nuclear magnetic resonance spectroscopy (ss-NMR). The band gap is reduced with increasing Fe content owing to the strong overlap of the Fe-3d orbitals with Cl-3p orbitals and shift of the valence band maxima (VBM) toward higher energies, as confirmed by ultraviolet photoelectron spectroscopy (UPS) and density functional theory (DFT) analyses. Photoluminescence (PL) studies of Cs2NaBi1-xFexCl6 phosphors exhibit a large Stokes shift, broadband emission, and increased PL intensity more than ten times for 15% of Fe content phosphor with enhancement in the average decay lifetimes (up to 38 ns) compared to pristine Cs2NaBiCl6 DP. These results indicate that the transition of dark self-trapping of excitons (STEs) into bright STEs enhances yellow emission. XRD, UV, and thermo-gravimetric analysis (TGA) confirmed that the Cs2NaB1-xFexCl6 DPs have good structural and thermal stabilities. Our findings indicate that the doping of Fe3+ cations into the Cs2NaBiCl6 lattice is a constructive strategy to enhance significantly the optoelectronic properties of these phosphors.</p>
1 aUdavant, Rohini1 aThawarkar, Sachin1 aRondiya, Sachin1 aShelke, Ankita1 aAher, Rahul1 aAjithkumar, Thalasseril, G.1 aCross, Russell, W.1 aDzade, Nelson, Y.1 aJadkar, Sandesh  uhttps://library.ncl.res.in/content/lead-free-solid-state-mechanochemical-synthesis-cs2nabi1-xfexcl6-double-perovskite-reduces