Laser flash photolysis study of the hydrogen atom transfer reaction from triplet 1-naphthol to ground benzophenone

Laser-induced photochemical gas-phase reactions of vibrationally excited triplet molecules

“…The intersystem crossing T1 yeS0, whose rate KTSO is a strongly increasing function of the temperature may be rate determining for slow component decay both at low pressures, when bimolecular processes are not yet impor-12 tant for DF decay and over the pressure range with KI>KTSO. It was shown [1 [1][2][3][4][5][6][7][8][9][10][11][12] that for molecules under study at the same vibrational excitation used the KVT …”

“…During last years the mechanisms of photoreduction for many carbonyl compounds was an active area of research [1][2][3][4] 2. Adding BG leads to a decrease in the time integrated relative intensity of the fast component I, described by the Stern-Volmer relation: la/I l+tPbgZ where I and 1 are the time-integrated intensities ofDF ofthe vapours and their mixtures with BG; 3 is the efficiency of vibrational energy transfer; Z is the rate constant of gas kinetic collisions; z is the lifetime of the vibrationally excited triplet molecules.…”

“…Influence of vibrational excitation on bimolecular reaction.The experimental data obtained make it possible to conclude that the changes in the decay rates and intensities of fast components are determined by the intermolecular vibrational relaxation within the triplet state T1. After several collisions the molecules tegrated intensity I/I of the fast component of the DF is reduced 1 .2, 1 .4, 2, and 5 times for Ar, SF6, pentane, and triethylamine, respectively 3. .…”

“…The temperature effects on the photochemical reaction have been examined. It was revealed that in gas phase strong temperature quenching oftriplets because ofincreasing intersystem crossing rate KT5O led to decrease ofthe photoreaction yield 3. It was found in the gas phase that the quenching rate constants of the triplet ketones were well correlated with the ionisation potentials of amines as hydrogen donor.…”

Hydrogen-Bonding-Induced Electron Transfer from Triplet N,N-Dialkyl-1-naphthylamines to Benzophenone via Triplet Exciplexes

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] However, little attention has been paid to the interactions of triplet-sensitized compounds with the ground state of tripletenergy donors until recently. [22][23][24][25][26][27][28][29][30][31][32] When naphthylammonium ion 22,25 and naphthol 24,26 were employed as triplet energy acceptors from triplet BP in acetonitrile (ACN) or a mixture of ACN and water (4:1 v/v) upon laser excitation at 355 nm, it was found by the production of the benzophenone ketyl radical and the corresponding naphthylamine cation and naphthoxy radicals that hydrogen atom transfer occurred from triplet naphthylammonium ion and naphthol to BP. [22][23][24][25][26][27][28][29][30][31][32] When naphthylammonium ion 22,25 and naphthol 24,26 were employed as triplet energy acceptors from triplet BP in acet...…”