Steric hindrance in the gas phase singlet electronic energy transfer: from naphthalene to the trans-azobutane isomers

Journal Article · Fri Oct 31 23:00:00 EST 1975 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.431870· OSTI ID:7199519

Loper, G L; Lee, E K.C.

The singlet intermolecular energy transfer rates from naphthalene (S/sub 1/, approx.91 kcal/mol) to the various trans-azobutane isomers have been measured in the gas phase. The first excited singlet states of these azobutane isomers lie below approx.70 kcal/mol. The rate constants for singlet collisional energy transfer (k/sub c/) are 30.3 +- 2.6, 18.9 +- 0.9, 12.6 +- 1.0, and 3.2 +- 0.3 in units of 10/sup 10/ M/sup -1/.sec/sup -1/, for the accepter series azo-n-butane, azoisobutane, azo-sec-butane, and azo-tert-butane, respectively. The tenfold decrease in the rates of energy transfer through this series have been attributed to increasing steric inhibition of the electron exchange contribution to singlet-singlet electronic energy transfer. (auth)

• Research Organization: Univ. of California, Irvine
• OSTI ID: 7199519
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 63:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKANES
AROMATICS
AZO COMPOUNDS
BUTANE
COLLISIONS
CONDENSED AROMATICS
ENERGY TRANSFER
HYDROCARBONS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NAPHTHALENE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS