Raman characterization of metal-alkanethiolates

Bensebaa, Farid; Zhou, Yu; Brolo, Alexandre G.; Irish, D. E.; Deslandes, Yves; Kruus, Erik; Ellis, T. H.

doi:10.1016/s1386-1425(98)00286-8

Cited by 62 publications

(56 citation statements)

References 31 publications

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“…It has been shown from a study of alkyl dithiocarbamates that the lengthening of the alkyl chain is accompanied by a decrease in ν(C-N) although the ν(C-S) remains unaltered as it has been found to be insensitive to the nature of alkyl substituents. 21 The ν(M-S), 22 occurring in the far-IR region depends on the nature of the metal ion and the substituents attached with the sulfur. We have observed medium intensity ν(M-S) in the 527-442 cm -1 range which is in agreement with the observations made by Sonbati.…”

Section: Ir Spectramentioning

confidence: 99%

Template synthesis of symmetrical transition metal dithiocarbamates

Siddiqi¹,

Nami²,

Lutfullah³

et al. 2006

J. Braz. Chem. Soc.

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have chlorine bridged distorted-octahedral geometry. It has been observed that the dithiocarbamato moiety is symmetrically bonded in all the cases. A three stage TGA profile is observed for all the complexes leading to the formation of respective metal sulfide as the end-product. The molar conductance of 10 -3 mol L -1 solution of the complexes measured in DMSO is indicative of their non-ionic nature. Keywords: dithiocarbamates, transition metals, thermal analysis, symmetrical bonding IntroductionDithiocarbamates are used to stabilize a wide range of oxidation states of different metal ions. 1 A large number of compounds are known where CS 2 binds in η 1 -end on, η 2 -side or in η 3 -coordination modes. 2-4 The major advantage of using the small bite-angle of dithiocarbamato moiety as a stabilizing chelating ligand, is its unique property to remain intact under a variety of reaction conditions. 5 Nowadays copper(II) dithiocarbamate is successfully used as single source precursor for the growth of semiconducting copper sulfide thin films. 6 The iron(II), iron(III) dithiocarbamates have been studied for their spincrossover phenomenon, 7 radical traps for NO, 8 and as antioxidants and pro-oxidants in biological systems. 9 Diethyl dithiocarbamates are also known to inhibit the activity of Cu/Zn-superoxidedismutase (SOD) through the withdrawal of copper from the protein both in vivo and in vitro. 10 Some dialkyl-substituted dithiocarbamates have proved to be an efficient anti-alkylating, anti-HIV and froth-floatation agents. 11 The optical and electrochemical properties of dithiocarbamates can effectively be used to construct sensors for guest molecules and macromolecules. [12][13][14] In this paper, we report a convenient one-pot synthesis of the transition metal dithiocarbamates via template procedure. In the present work, a condensation reaction was carried out between acetylacetone, ethylenediamine, 108 Siddiqi et al. J. Braz. Chem. Soc. carbon disulfide in a single step leading to the formation of a ring like complex ( Figure 1 and Figure 2). ExperimentalHydrated metal chlorides (BDH) acetylacetone, carbon disulfide (Merck) and ethylenediamine (Ranbaxy) were used as received. Methanol was used after distillation. Elemental analyses (C, H, N and S) were carried out with a Flash EA-1112 Analyser, CE Instrument. IR spectra (4000-400 cm -1 ) were recorded on a FT-IR Perkin-Elmer Spectrum BX as KBr disc while the 600-200 cm -1 range were scanned on CsI on Nexus FT-IR Thermo Nicolet, Madison Wisconsin. The conductivity measurements were carried out with a CM-82T Elico conductivity bridge in DMSO. The electronic spectra were recorded on a Cintra 5GBC spectrophotometer in DMSO. Magnetic susceptibility measurements were done with a Sherwood Scientific MSB Auto at room temperature. TGA/DSC was performed with a Universal V3.8 B TA SDT Q600 Build 51 Thermal Analyzer under nitrogen atmosphere using alumina powder as reference material. The heating rate was maintained at 10 °C min -1 . The metal contents were estimated by...

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Section: Ir Spectramentioning

confidence: 99%

Template synthesis of symmetrical transition metal dithiocarbamates

Siddiqi¹,

Nami²,

Lutfullah³

et al. 2006

J. Braz. Chem. Soc.

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show abstract

“…In this paper, an extensive study, concerning the interaction among in-situ synthesized thiol-capped silver nanoparticles embedded in a polymeric matrix obtained by thermal decomposition of the silver(I)-thiolates different types (AgS(CH 2 ) n X, where n is the number of carbon atoms that form the chain length and X symbolizes the terminal group of the chain), is reported [21][22][23]. The influence of thiol structure on the interaction between adjacent nanoparticles was studied and characterization of samples obtained from different precursors by X-Ray diffraction (XRD) transmission electron microscopy (TEM), differential scanning calorimetric (DSC) and UV-Vis optical spectroscopy was reported.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

et al. 2011

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Thiol-capped silver nanoparticles were prepared by in situ thermal decomposition of different silver(I)-thiolates precursors in a polymeric matrix. Depending on the structure of the organic coating, contact-free distribution of metal nanoparticles or nanoparticles aggregates were achieved. The structure and morphology of nanocomposites was analyzed by Transmission Electron Microscopy (TEM), and X-Ray Diffraction (XRD). Nanoparticles' interaction was investigated by differential scanning calorimetry (DSC), and UV-Visible spectroscopy. In particular, only silver nanoparticles coated by n-alkyl thiols aggregated, while a contact-free dispersion was obtained by cyclohexyl thiol-capped silver nanoparticles.

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“…In Raman spectra (Fig. 4), the peaks of C-S stretching modes next to gauche conformation and trans conformation appeared at ~640 and at ~710 cm -1 , respectively 24 . In particular, the peak at ~640 cm -1 observed clearly in the early stages of the reaction with all sizes of ODT-AuNPs.…”

Section: Resultsmentioning

confidence: 98%

“…Although the adsorbed structures of alkanethiols have been reported to be affected by alkyl chain length and particle diameter [23][24][25][26][27][28] , the formation process of the SAMs on the surfaces of AuNPs have not yet been studied systematically.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

Ishida

Tachikiri

Takahashi

et al. 2015

Trans. Mat. Res. Soc. Japan

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The preparation method of hydrophobic gold nanoparticles (AuNPs) with the diameters of 17, 30 and 48 nm has been developed. So as to clarify the size effects of AuNPs on the hydrophobization processes, time courses for the formation of the self-assembled monolayers (SAMs) of octadecanethiol (ODT) molecules on the surfaces of the AuNPs have been investigated by means of FT-IR and Raman spectroscopies. In all cases, the alkyl chains were mainly arranged as all-trans conformation (solid-like) at the completion of the reaction. Observation of the time course of ODT-SAM formation revealed that smaller curvature (larger size) resulted in the faster formation of SAM because of smaller conical volume snugly available for the alkyl chain on the surface of the AuNP.

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Raman characterization of metal-alkanethiolates

Cited by 62 publications

References 31 publications

Template synthesis of symmetrical transition metal dithiocarbamates

Template synthesis of symmetrical transition metal dithiocarbamates

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles

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