THE RAMAN SPECTRA OF TRICHLOROETHYLENE: C₂HCl₃ AND C₂DCl₃

Abstract

not available

Room-temperature chemisorption and thermal evolution of perchloroethylene and trichloroethylene on Si(111)7×7: Formation of chlorinated vinylene and vinylidene and acetylide adspecies, and thermal etching reactions

“…1), the two additional features at 2980 cm À1 and 1150 cm À1 for the TCE sample can be attributed to the C-H stretching and CH in-plane bending modes, respectively. These assignments are in general accord with those for the gas-phase data [17][18][19]. The presence of the C@C stretch at 1510 cm À1 is clearly established for TCE (and PCE) without the presence of neighbouring CH 2 scissoring modes that often obscure this region in the case of other hydrocarbons [17,21].…”

“…1). To facilitate spectral assignments, we compare the surface vibrational EELS data obtained in the present work with the corresponding infrared and Raman spectroscopic data of chloroethylenes obtained in the gas or liquid phase [17][18][19][20]. The features observed at 1490 cm À1 , 820 cm À1 and 510 cm À1 can be assigned predominantly to the C@C, C-Cl, and Si-Cl stretching modes, respectively.…”

Atomic Chlorination of Simple Hydrocarbon Derivatives in the Gas Phase.

“…where (Rs) is the steady state concentration of the radical R. t" is obtained from measurements of rates in intermittent light vt and steady light vs, from the duration of the light flash t and the ratio r of dark to light period y = Vi/v, -(R)i/(R), = {1 + (l/m) In [1 + rrn/ (l + (R)./(R)i)])/(r + 1) (10) where m = t/ , and (R)< and (R)i are, respectively, the mean concentrations of R and its concentration " Limiting values between which equation 12 yields log m values within 1% of the theoretical. 6 Factor by which the error in rate measurements is multiplied when m is calculated.…”

“…A general scheme has been proposed for the free radical mechanism (112) This scheme makes it possible to predict whether a given pyrolysis is molecular or proceeds by free radicals. If a = 1, the hydrogen abstraction reaction (fa) gives (6) The photolysis of this compound proceeds by the same mechanism (203). (7) Except for ChHiCl, 1,1-C2H«C15, 1,1,1-CjHaCls.…”

Darstellung der Dichlormethyleniminium‐Salze Cl2CNClH+ MF6− und Cl2CNClCH3+ MF6− (M = As, Sb) und Kristallstruktur von Dichlormethyleniminiumhexachloroantimonat Cl2CNH2+SbCl6−

“…Die Valenz-und Deformationsschwingungen der CC1,-Gruppe werden durch die positive Ladung erwar-tungsgemaJ3 gegeniiber dcnen des neutralen Trichlorme-Tabelle 3 Schwingungsfrequenzen der Salze ClzC=NC1H'MF6-(M = As, Sb) und C12C=NCID'AsF6 CI,C=NClH + ClzC = NCID' CI,C= CClD ClzC = CClH C1,C = NCI Zuordnung Ra IR Ra IR IR IR [22] IR [22] IR [21] ASF6-SbF6-1 577 (95) 1425 (15) 859 (7) . Im SbCl,--Anion liegen die mittleren Sb-C1-Abstande in der asymmetrischen Einheit bei 236,5 bzw.…”