A-BAND RESONANCE RAMAN-SPECTRA OF 1,2-DIIODOETHANE IN CYCLOHEXANE SOLUTION - SUBSTITUENT EFFECTS ON THE 1-HALO-2-IODOETHANE SHORT-TIME PHOTODISSOCIATION DYNAMICS

Resonance Raman spectra of 1,2-diiodoethane in cyclohexane solution ha ve been obtained in the A-band absorption. A resonance Raman intensity analysis was done to examine the short-time photodissociation dynamic s of 1,2-diiodoethane. Significant bond length and bond angle changes were found for both C-I bonds and the C-C bond as well as the CCI and HCH bond angles. Comparison of the Franck-Condon region dynamics of 1, 2-diiodoethane with diiodomethane suggests that the degree of coupling of the two C-I chromophores depends on both the relative geometry of the C-I bonds and their relative separation. (C) 1998 Elsevier Science B.V. All rights reserved.