Vibrational Spectra and Rotational Isomerism in 2-Mercaptoethanol

Nandy, Suman; Mukherjee, Debabrata; Roy, Santanu; Kastha, G. S.

doi:10.1139/v73-169

Cited by 28 publications

(34 citation statements)

References 4 publications

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“…4, the infrared bands appear at 1009, 1044, 1065, 2856, and 2927 cm À1 . Table 1 compares these bands with the infrared frequencies of HSCH 2 CH 2 OH in liquid phase [7]. The 1044, 1065, 2856, and 2927 cm À1 agree with the absorp- Fig.…”

Section: Resultssupporting

confidence: 54%

“…4, the spectra recorded from 115 K to 175 K are similar. Since the S-H breakage temperatures of C 2 H 5 SH on Cu (1 1 1) and (1 1 0) are far below 175 K, it is very likely that the S-H bond dissociates upon HSCH 2 CH 2 OH adsorption on Cu(1 0 0) at 115 K. Taken together with the intact moiety of SCH 2 CH 2 OH inferred from the infrared band frequencies and predominant C 2 H 4 desorption, it is proposed that -SCH 2 CH 2 OH is generated from HSCH 2 CH 2 OH dissociative adsorption on Cu(1 0 0) at 115 K. Stretching bands of S-H at $2550 cm À1 and O-H at $3475 cm À1 [7] are not observed in the 115 K spectra of Fig. 4.…”

Section: Vibrational Studies Of Thermal Decomposition Of Hsch 2 Ch 2 Ohmentioning

confidence: 84%

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Thermal reactions of mercaptoethanol on Cu(100)

et al. 2005

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Section: Resultssupporting

confidence: 54%

Section: Vibrational Studies Of Thermal Decomposition Of Hsch 2 Ch 2 Ohmentioning

confidence: 84%

Thermal reactions of mercaptoethanol on Cu(100)

et al. 2005

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“…This is supported by the peak due to C-N stretching vibration changing from 1251 to 1261 cm -1 and the N-H bending vibration peak in SPIONs@Au-Cysteamine at 806 cm -1 changing to a weak broad peak at 804 cm -1 after binding to LHRH. 21 - 22 The binding of cysteamine to Au shells and LHRH to cysteamine is also confirmed by XPS studies ( Figure S5). …”

mentioning

confidence: 60%

Magnetic Gold Nanoshells: Stepwise Changing of Magnetism through Stepwise Biofunctionalization

Kumar

Mohammad

2010

J. Phys. Chem. Lett.

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We report step-wise changing of magnetic behavior of iron oxide core gold shell nanoparticles from super paramagnetic to permanent magnetism at room temperature, on step-wise biofunctionalization with leutenizing hormone and releasing hormone (LHRH) through cysteamine linker. The observed permanent magnetism at room temperature in LHRH-capped gold nanoshells provides opportunities to extend fundamental investigations of permanent magnetism to other novel nanostructures and biofunctionalized nano gold architectures, simultaneously opening the way to newer applications, especially to those in biomedicine. KeywordsIron oxide nanoparticles; SPION; Gold nanoshell; SPION@Au; Thiol capping; leutenizing hormone and releasing hormone (LHRH); Biofunctionalization It is well known that bulk gold is diamagnetic due to counteraction of paramagnetic behavior of conduction electrons by orbital and ionic core diamagnetism. On the other hand, single gold atoms are paramagnetic because of the unpaired 6s electron. 1 There is a distinct change in the magnetism as one goes from gold atoms to nano gold and further to bulk gold and these fundamental changes in the magnetism are interesting from basic research as well as practical applications. Adding to this is recently reported chemically induced ferromagnetism in thiol-capped gold nanoparticles. 2 The chemically induced permanent magnetism was also extended to Ag and Cu nano clusters. 3 The surprising induction of permanent magnetism, under some conditions of chemisorptions, in small nanoparticles of a bulk-diamagnetic metal is likely through an interaction of s and p orbitals of adsorbates such as thiolates with 5d-orbitals of metal atoms. This interaction is anticipated to lead to emergence of 5d-localized holes as a result of significant charge transfer occurring from the metal atoms to sulfur atoms in the adsorbate molecule. The Au L3-edge extended X-ray absorption near-edge structure (EXAFS) measurements confirm the existence of these holes in Au nanoparticles capped with thiolates. 4 , 5 This interaction between the orbitals of S and Au is ultimately responsible for the onset of magnetism in thiol-capped gold nanoclusters. Recent literature reports indicate that different types of thiol-capped Au nanoparticles showed a great variety of effects going from giant paramagnetism, 6 superparamagnetism, 7 and even to permanent magnetism. 2 , 8 * Corresponding Author: To whom correspondence should be addressed. ckumar1@lsu.edu . Supplementary Figures S1-S7 and Table S1. This material is available free of charge via the Internet at http://pubs.acs.org. We synthesized SPIONs (Fe 3 O 4 ) and gold coated SPIONs (Fe 3 O 4 @Au) modifying the procedure described previously. 16 The SPIONs@Au nanoparticles were purified magnetically making them free of unwanted residual amount of pure Au nanoparticles. The HRTEM measurements show their spherical nature and the mean size of SPIONs@Au is 6.3 ± 0.7 nm compared to 5.4 ± 0.4 nm for SPIONs (Figure 1 and S1). The particles are well dispersi...

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“…DRIFT spectra showed the chemical changes on the surface of Pb foils (Figure ). The peak located at 667 cm −1 can be assigned to C─S stretching vibration from the organic matter in the PDA medium . Its weakened intensity during incubation suggested the fungal consumption of the medium.…”

Section: Resultsmentioning

confidence: 97%

Tracking the fungus‐assisted biocorrosion of lead metal by Raman imaging and scanning electron microscopy technique

Shao

Jiao

et al. 2020

J Raman Spectroscopy

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Fungi play a significant role in biological corrosion of metal materials. We studied the biocorrosion of lead foils under incubation of Aspergillus niger (A. niger). Multiple techniques, for example, scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and Raman imaging and scanning electron microscopy (RISE), were applied in this study. SEM confirmed the normal growth of the fungus on Pb foil surface, either above or under the solid medium surface. In addition, SEM‐energy dispersive spectrometer confirmed the formation of the secondary Pb mineral particles after incubation, which had variable morphologies. DRIFT was able to show changes of compounds formed on the surface of Pb foils. However, it cannot exactly identify the mineral phase. RISE technology offered both morphological and spectral information of the formed Pb mineral. Three dominant Raman peaks at ~1,440, ~1,480, and ~1,590 cm−1 indicated that the secondary mineral was lead oxalate. Raman mapping further demonstrated the distribution of Pb oxalate architecture. This study first applied RISE to investigate the biocorrosion of metals by fungi.

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Vibrational Spectra and Rotational Isomerism in 2-Mercaptoethanol

Cited by 28 publications

References 4 publications

Thermal reactions of mercaptoethanol on Cu(100)

Thermal reactions of mercaptoethanol on Cu(100)

Magnetic Gold Nanoshells: Stepwise Changing of Magnetism through Stepwise Biofunctionalization

Tracking the fungus‐assisted biocorrosion of lead metal by Raman imaging and scanning electron microscopy technique

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