Kinetics of Disappearance of the CN Radical Formed from C2N2

Abstract

Articles you may be interested in Trends in C-O and C-N bond formations over transition metal surfaces: An insight into kinetic sensitivity in catalytic reactionsThe flash photolysis technique has been extended to measurement of absolute concentrations and kinetics of small molecules h~ving fine-lined absorption spectra. The rates of disappearance of CN radicals in cyanogen, cyanogen chlonde, hydrogen, and hydrocarbons have been determined. The disappearance of CN in cyanogen was found to obey the expression d(CN) /dt= -k (CN) (C 2 N2), where k= 7.3X10 7 e--c2100/RT liters/ mole sec over the temperature range 301 0 to 447°K.

Shock Waves

“…He showed that it was possible to study the con densation of a low vapor pressure material on the inner surface of the shock tube. This is in agreement with data on the kinetics of disappearance of CN radicals obtained by an other technique (40) . This occurs on a time scale of the order of microseconds.…”

A Novel Methode of 14C-Labeling : Preparation of Carrier-Free Nitriles Via Thermal Decomposition of Neutron-Irradiated Cu3N in the Presence of Organic Substrates

“…En excluant la présence de 128 L'énergie de recul de 128 I serait de 182 eV si la totalité de l'énergie de liaison du neutron (6,6 MeV) était libérée par l'émission d'un seul photon [8], Elle est certainement inférieure à cette valeur en raison de la complexité du schéma de désexcitation du noyau composé* et de la distribution de l'énergie interne parmi les divers degrés de liberté de la molécule parent. Néanmoins, la rétention «nucléaire» ne peut contribuer que dans une faible proportion à la rétention de 128 I qui résulte principalement de l'efficacité de processus de recombinaisons mettant en jeu des atomes dont la réactivité est exaltée à la suite du processus nucléaire, comme le prouve l'oxydation partielle de 128 I en ivii**.…”

“…Oxydation of CN or CN 2 has been made responsible for the C0 2 -production [3,7]. Photolytically produced CN-radicals are also known to react rapidly with O s , giving rise to NCO as the primary product [8,13]. A rate constant of 4.6-10 12 ml mole -1 s _1 (room temperature) has been determined for this oxydation step [13].…”

Pumped Transformer Lasers

“…The absorption measurement required 4 meters path length of gas at a few mm pressure, so the CN X concentration was not very great in this low power steadystate experiment. Paul and Dalby (1962) used a 100 joule "flash photolysis lamp" of much greater instantaneous power than the Hg lamp, but having a broad-band UV spectrum. Probably the usual quartz envelope of such a lamp would not transmit much light of shorter wavelength than about 1900-185oX, or 52, 800-54, 000 cm" x .…”

“…The polymerization mechanism will therefore be an important contributor to the disappearance of CN, whenever CN is produced in any manner which leaves a considerable remainder of (CNL present. The most recent quantitative rate measurements in such circumstances are by Paul and Dalby (1962) Since the polymer seems quite stable at ordinary temperatures, the polymerization reaction must be exothermic. There do not seem to be data available on how much sensible heat appears in the gas with the removal of each CN,…”