Isomer-specific ultraviolet spectroscopy of m- and p-divinylbenzene.
The ultraviolet spectroscopy of m- and p-divinylbenzene isomers (mDVB and pDVB) was studied by a combination of methods, including resonance-enhanced two-photon ionization (R2PI), laser-induced fluorescence (LIF), UV-UV hole-burning spectroscopy (UVHB), and single vibronic level fluorescence spectroscopy (SVLF). In mDVB, there are three low-energy conformations, cis-cis, cis-trans, and trans-trans whose S1 <-- S0 origins occur at 31,408, 31,856, and 32,164 cm(-1), respectively, as confirmed by UVHB spectroscopy. There are two possible conformations in pDVB, cis and trans. UVHB studies confirm the S1 <-- S0 origin of trans-pDVB occurs at 32,553 cm(-1), and the corresponding cis-pDVB origin is tentatively assigned to a transition at 32 621 cm(-1). SVLF studies were used to determine several of the vinyl torsional levels of the isomers of mDVB and pDVB. A two-dimensional flexible model was used to fit these levels in mDVB to a potential form and determine the barriers to isomerization.
Selby
Talitha M
TM
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA.
Meerts
W Leo
WL
Zwier
Timothy S
TS
D002627:Chemistry, Physical / Q000379:methods; D005453:Fluorescence; D007536:Isomerism; D007834:Lasers; D008958:Models, Molecular; D008968:Molecular Conformation; D013050:Spectrometry, Fluorescence / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D013343:Styrenes / Q000737:chemistry*
D013343:Styrenes; C076011:1,3-diethenylbenzene