Organic-to-Aqueous Phase Transfer of Alloyed AgInS2-ZnS Nanocrystals Using Simple Hydrophilic Ligands: Comparison of 11-Mercaptoundecanoic Acid, Dihydrolipoic Acid and Cysteine

The exchange of primary hydrophobic ligands for hydrophilic ones was studied for two types of alloyed AgInS2-ZnS nanocrystals differing in composition and by consequence exhibiting two different emission colors: red (R) and green (G). Three simple hydrophilic ligands were tested, namely, 11-mercaptoundecanoic acid, dihydrolipoic acid and cysteine. In all cases, stable aqueous colloidal dispersions were obtained. Detailed characterization of the nanocrystal surface before and after the ligand exchange by NMR spectroscopy unequivocally showed that the exchange process was the most efficient in the case of dihydrolipoic acid, leading to the complete removal of the primary ligands with a relatively small photoluminescence quantum yield drop from 68% to 40% for nanocrystals of the R type and from 48% to 28% for the G ones.

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Synthesis and Characterization of the Double Salts [Pt(bzq)(CNR)2][Pt(bzq)(CN)2] with Significant Pt···Pt and π···π Interactions. Mechanistic Insights into the Ligand Exchange Process from Joint Experimental and DFT Study

Organometallics ◽

10.1021/om201036z ◽

2012 ◽

Vol 31 (7) ◽

pp. 2729-2740 ◽

Cited By ~ 11

Author(s):

Juan Forniés ◽

Sara Fuertes ◽

Carmen Larraz ◽

Antonio Martín ◽

Violeta Sicilia ◽

...

Keyword(s):

Ligand Exchange ◽

Exchange Process ◽

Dft Study ◽

Synthesis And Characterization ◽

Π Interactions ◽

Double Salts

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Conductivity and dielectric studies of Li3+-irradiated PVP-based polymer electrolytes

High Performance Polymers ◽

10.1177/0954008318780494 ◽

2018 ◽

Vol 30 (8) ◽

pp. 978-985 ◽

Cited By ~ 3

Author(s):

Divya Singh ◽

D Kanjilal ◽

GVS Laxmi ◽

Pramod K Singh ◽

SK Tomar ◽

...

Keyword(s):

Polymer Electrolyte ◽

Polymer Electrolytes ◽

Sodium Iodide ◽

Ion Beam ◽

Charge Carriers ◽

Detailed Characterization ◽

Before And After ◽

Ion Conducting ◽

Ion Conducting Polymer

Poly(vinylpyrrolidone) (PVP) complexed with sodium iodide (NaI) is synthesized to investigate the ionic conductivity of alkaline-based polymer electrolytes. In this article, we report the modification of electrical properties of a new ion-conducting polymer electrolyte, namely, PVP complexed with NaI. Modification of polymer electrolyte was carried out before and after the exposure of films by bombarding them at different fluences with respect to Li3+ ion beam at 60 MeV. The preparation and detailed characterization of PVP:NaI is being reported. Further, a correlation with conductivity and dielectric constant has also been established. The modulation in the conductivity is explained in terms of number of charge carriers ( n) and its mobility ( μ), which confirms the behavior of the polymer electrolyte as an alternative strategy to improve the conductivity.

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Easy and Fast Phase Transfer of CTAB Stabilised Gold Nanoparticles from Water to Organic Phase

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2014-0647 ◽

2015 ◽

Vol 229 (1-2) ◽

Cited By ~ 8

Author(s):

Susann Kittler ◽

Stephen G. Hickey ◽

Thomas Wolff ◽

Alexander Eychmüller

Keyword(s):

Gold Nanoparticles ◽

Ligand Exchange ◽

Phase Transfer ◽

Ammonium Bromide ◽

Fast Phase ◽

Before And After ◽

Cheap Method ◽

Different Shapes ◽

Hexadecyltrimethyl Ammonium Bromide ◽

Anisotropic Gold Nanoparticles

AbstractSpheric and anisotropic gold nanoparticles (GNPs) such as rods, stars or nanoprism prepared using hexadecyltrimethyl ammonium bromide (CTAB) as the stabilising agent have received a great deal of interest in the last years. The literature procedures exploited lead to GNPs in aqueous solution. We herein describe a fast, efficient, and cheap method to transfer particles of different shapes from water into toluene solution via ligand exchange (CTAB to dodecanethiol), which was mediated by acetone as a cosolvent. Absorption spectra and TEM-pictures before and after the transfer revealed that the particles survived the transfer intact and without change in shape.

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PREPARATION AND CHARACTERIZATION OF SODIUM LAURYL ETHER SULPHATE MODIFIED LAYERED DOUBLE HYDROXIDES

Jurnal Teknologi ◽

10.11113/jt.v76.5523 ◽

2015 ◽

Vol 76 (3) ◽

Cited By ~ 1

Author(s):

Siti Hasnawati Jamal ◽

Wan Md Zin Wan Yunus ◽

Noor Azilah Mohd Kasim ◽

Ong Keat Khim ◽

Mansor Ahmad

Keyword(s):

Layered Double Hydroxides ◽

Exchange Process ◽

X Ray Diffraction ◽

Ion Exchange Process ◽

Lauryl Ether ◽

Before And After ◽

Trivalent Cations ◽

Co Precipitation ◽

Double Hydroxides

Layered double hydroxides (LDHs) has attracted much attention of many industrialists as well as academicians as these materials can be used as catalysts, adsorbents, anion exchangers, stabilizers and fillers for polymers. The materials which consist of divalent and trivalent cations, and anions are nontoxic and easy to prepare. In addition, the exchangeability of their anions makes them easy to be modified to increase their hydrophobicity property through anion exchange process using long chain surfactant anions. In this study, sodium lauryl ether sulphate (SLES) modified LDHs was prepared by co precipitation of LDHs and followed SLES ions modification via ion exchange process. Intercalations of the anions into the LDHs layers were confirmed by X-ray diffraction analysis. The presence of functional groups before and after modification was studied by FTIR spectrometry. Thermalgravitmeric analysis also was carried out to determine the amount of surfactant intercalated into LDHs.

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Mixed-ligand systems containing quadruple bonds. Capture and structural characterization of an intermediate in the ligand exchange process leading to new carboxylates of the dimolybdenum(4+ unit. Synthesis and X-ray crystallographic and electrochemical studies of Mo2[(η5-C5H4CO2)Fe(η5-C5H5)]2(O2CCH3)2(C5H5N)2 and [Mo2](η5-C5H4CO2)Fe(η5-C5H5)]4(ax-CH3CN)(ax-DMSO)](DMSO)2

Journal of Organometallic Chemistry ◽

10.1016/0022-328x(87)80350-9 ◽

1987 ◽

Vol 319 (1) ◽

pp. 87-97 ◽

Cited By ~ 33

Author(s):

F.A. Cotton ◽

L.R. Falvello ◽

A.H. Reid ◽

J.H. Tocher

Keyword(s):

Structural Characterization ◽

Ligand Exchange ◽

Exchange Process ◽

Mixed Ligand ◽

Electrochemical Studies ◽

X Ray ◽

Quadruple Bonds

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An Electron Microscope Study of Interdiffusion and Compound Formation in Ta-Au Thin Films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070606 ◽

1973 ◽

Vol 31 ◽

pp. 32-33 ◽

Cited By ~ 1

Author(s):

T. C. Tisone ◽

S. Lau

Keyword(s):

Electron Microscope ◽

Electron Microscope Study ◽

Thermally Grown Oxide ◽

Ion Milling ◽

Compound Formation ◽

Technology Application ◽

Transmission Electron ◽

Before And After ◽

Au Thin Films

In a study of the properties of a Ta-Au metallization system for thin film technology application, the interdiffusion between Ta(bcc)-Au, βTa-Au and Ta2M-Au films was studied. Considered here is a discussion of the use of the transmission electron microscope(TEM) in the identification of phases formed and characterization of the film microstructures before and after annealing.The films were deposited by sputtering onto silicon wafers with 5000 Å of thermally grown oxide. The film thicknesses were 2000 Å of Ta and 2000 Å of Au. Samples for TEM observation were prepared by ultrasonically cutting 3mm disks from the wafers. The disks were first chemically etched from the silicon side using a HNO3 :HF(19:5) solution followed by ion milling to perforation of the Au side.

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Intramolecular Proton Transfer in the Isomerization of Hydroxyacetone: A Detailed Characterization Based on Reaction Force Analysis and the Bond Fragility Spectrum

10.26434/chemrxiv.12049062 ◽

2020 ◽

Author(s):

Wallace Derricotte ◽

Huiet Joseph

Keyword(s):

Chemical Potential ◽

Reaction Force ◽

Intramolecular Proton Transfer ◽

Intermediate Energy ◽

Force Analysis ◽

Activation Energy Barrier ◽

Detailed Characterization ◽

Proton Transfers ◽

Reaction Force Constant

The mechanism of isomerization of hydroxyacetone to 2-hydroxypropanal is studied within the framework of reaction force analysis at the M06-2X/6-311++G(d,p) level of theory. Three unique pathways are considered: (i) a step-wise mechanism that proceeds through formation of the Z-isomer of their shared enediol intermediate, (ii) a step-wise mechanism that forms the E-isomer of the enediol, and (iii) a concerted pathway that bypasses the enediol intermediate. Energy calculations show that the concerted pathway has the lowest activation energy barrier at 45.7 kcal mol<sup>-1</sup>. The reaction force, chemical potential, and reaction electronic flux are calculated for each reaction to characterize electronic changes throughout the mechanism. The reaction force constant is calculated in order to investigate the synchronous/asynchronous nature of the concerted intramolecular proton transfers involved. Additional characterization of synchronicity is provided by calculating the bond fragility spectrum for each mechanism.

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