The vibrational spectra of methanethiol

May, Ingo W.; Pace, E. L.

doi:10.1016/0584-8539(68)80209-0

Cited by 72 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…͒ cm −1 are readily assigned to CH 3 SH 62. 63 A broad feature near 1527.8 cm −1 is assigned to 3 of CS 2 , but unassigned weaker lines at 640.0, 751.1, 761.1, and 1442.7 cm −1 do not correlate to those predicted for CH 3 S by Marenich and Boggs.…”

mentioning

confidence: 85%

Diminished cage effect in solid p-H2: Infrared absorption of CH3S observed from photolysis in situ of CH3SH, CH3SCH3, or CH3SSCH3 isolated in p-H2 matrices

Bahou

Lee

2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

We report the infrared absorption spectrum of the methylthio (or thiomethoxy) radical, CH(3)S (X (2)E(3/2)), produced via photodissociation in situ of three precursors CH(3)SH, CH(3)SCH(3), and CH(3)SSCH(3) isolated in solid p-H(2). The common absorption features observed with similar intensity ratios in each experiment are assigned to CH(3)S. The wavenumbers of these features agree satisfactorily with those predicted with a spin-vibronic Hamiltonian accounting for the anharmonic effects and the Jahn-Teller effects to the quartic term [A. V. Marenich and J. E. Boggs, J. Chem. Theory Comput. 1, 1162 (2005)]. In addition to an absorption line at 724.2 cm(-1), corresponding to a transition of 3(1) previously determined to be 727 cm(-1) from fluorescence spectra of gaseous CH(3)S, we identified fundamental transitions 6(1)(a(1)) at 771.1, 6(1)(e) at 1056.6, 5(1)(a(1)) at 1400.0, 4(1)(a(1)) at 2898.4 cm(-1), and several combination and overtone transitions. In contrast, photolysis of CH(3)SSCH(3) isolated in solid Ar produces mainly H(2)CS, CH(3)SH, and CS(2), but no CH(3)S. These results demonstrate the feasibility of using photolysis in situ of precursors isolated in solid p-H(2) to produce free radicals by taking advantage of the diminished cage effect of the matrix.

show abstract

mentioning

confidence: 85%

Diminished cage effect in solid p-H2: Infrared absorption of CH3S observed from photolysis in situ of CH3SH, CH3SCH3, or CH3SSCH3 isolated in p-H2 matrices

Bahou

Lee

2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…3(b)-5(b) are nearly identical; they are expected to represent the IR spectrum of CH 3 SH, if we assume that the ionization efficiencies for these vibrationally excited states are nearly identical at 132.50 nm. By comparison with the reported spectrum of gaseous CH 3 SH, 37 the feature near 2608 cm −1 is assigned to the SH-stretching (ν 3 ) mode and those features near 2949 and 3014 cm −1 are assigned to the symmetric CH 3 -stretching (ν 2 ) and the out-of-phase CH-stretching coupled with symmetric CH 2 -stretching (ν 1 )/ antisymmetric CH 2 -stretching (ν 9 ) modes, respectively; the absorption bands of the ν 1 and ν 9 modes are too close to be resolved. The remaining features are due to overtone or combination bands: 2522 (ν 4 + ν 6 ), 2868 (2ν 10 ), and 2895 cm −1 (2ν 4 ).…”

Section: Ir Spectra Of Ch 3 Shmentioning

confidence: 99%

Infrared absorption of methanethiol clusters (CH3SH)n, n = 2–5, recorded with a time-of-flight mass spectrometer using IR depletion and VUV ionization

Han

Lee

2012

The Journal of Chemical Physics

View full text Add to dashboard Cite

We investigated IR spectra in the CH- and SH-stretching regions of size-selected methanethiol clusters, (CH(3)SH)(n) with n = 2-5, in a pulsed supersonic jet using infrared (IR)-vacuum ultraviolet (VUV) ionization. VUV emission at 132.50 nm served as the source of ionization in a time-of-flight mass spectrometer. Clusters were dissociated with light from a tunable IR laser before ionization. The variations in intensity of methanethiol cluster ions (CH(3)SH)(n)(+) were monitored as the IR laser light was tuned across the range 2470-3100 cm(-1). In the SH-stretching region, the spectrum of (CH(3)SH)(2) shows a weak band near 2601 cm(-1), red-shifted only 7 cm(-1) from that of the monomer. In contrast, all spectra of (CH(3)SH)(n), n = 3-5, show a broad band near 2567 cm(-1) with much greater intensity. In the CH-stretching region, absorption bands of (CH(3)SH)(2) are located near 2865, 2890, 2944, and 3010 cm(-1), red-shifted by 3-5 cm(-1) from those of CH(3)SH. These red shifts increase slightly for larger clusters and bands near 2856, 2884, 2938, and 3005 cm(-1) were observed for (CH(3)SH)(5). These spectral results indicate that the S-H[middle dot][middle dot][middle dot]S hydrogen bond plays an important role in clusters with n = 3-5, but not in (CH(3)SH)(2), in agreement with theoretical predictions. The absence of a band near 2608 cm(-1) that corresponds to absorption of the non-hydrogen-bonded SH moiety and the large width of observed feature near 2567 cm(-1) indicate that the dominant stable structures of (CH(3)SH)(n), n = 3-5, have a cyclic hydrogen-bonded framework.

show abstract

“…Daraus ergeben sich neben den Schwingungen der C H 3-G ruppen sechs Ra-und IR-aktive Gerüstschwingun gen des Sulfonium-Ions. Die Zuordnung der Schwin gungen erfolgt im Fall des (CH3)2SH +MF6-im V er gleich zum isoelektronischen Phosphan (CH 3)2PH [8], dem CH 3SH [9] und dem (C H 3)2S [10] Spektren sehr breit, was auf eine starke Assoziation der Salze im Feststoff schließen läßt. A ußerdem kann bei C H 3SH2+MF6~ wie auch bei C H 3PH 2 und SH3+SbF6~ lediglich eine v(S-H) beobachtet werden.…”

Section: Schwingungs-und Nmr-spektren Der Primären Und Sekundären Metunclassified

“…A ußerdem kann bei C H 3SH2+MF6~ wie auch bei C H 3PH 2 und SH3+SbF6~ lediglich eine v(S-H) beobachtet werden. Die Linien sind mit 2540-2550 cm-1 gegenüber der S -H-Valenzschwingung im CH 3SH mit 2575 cm-1 [9] geringfügig zu niedrigeren W ellenzahlen hin ver schoben. Dieser Trend, der beim Übergang vom H 2S zum H 3S+ ebenfalls beobachtet wird, kann auf die Erhöhung der Koordinationszahl am Schwefelatom und die Ausbildung von W asserstoff-Brückenbin-dungen zurückgeführt werden.…”

Section: Schwingungs-und Nmr-spektren Der Primären Und Sekundären Metunclassified

Darstellung und spektroskopische Charakterisierung von primären und sekundären Sulfoniumsalzen [1] / Preparation and Spectroscopic Characterization of Primary and Secondary Sulfonium Salts [1]

Minkwitz

Gerhard

Norkat

1989

Zeitschrift Für Naturforschung B

View full text Add to dashboard Cite

show abstract

The vibrational spectra of methanethiol

Cited by 72 publications

References 15 publications

Diminished cage effect in solid p-H2: Infrared absorption of CH3S observed from photolysis in situ of CH3SH, CH3SCH3, or CH3SSCH3 isolated in p-H2 matrices

Diminished cage effect in solid p-H2: Infrared absorption of CH3S observed from photolysis in situ of CH3SH, CH3SCH3, or CH3SSCH3 isolated in p-H2 matrices

Infrared absorption of methanethiol clusters (CH3SH)n, n = 2–5, recorded with a time-of-flight mass spectrometer using IR depletion and VUV ionization

Darstellung und spektroskopische Charakterisierung von primären und sekundären Sulfoniumsalzen [1] / Preparation and Spectroscopic Characterization of Primary and Secondary Sulfonium Salts [1]

Contact Info

Product

Resources

About