0000000001299809
AUTHOR
D. Lenoir
Time-resolved photoisomerization of 1,1′-di-tert-butylstilbene and 1,1′-dicyanostilbene
Abstract Photoisomerization of 1,1′-di-tert-butylstilbene ( 3 ) and 1,1′-dicyanostilbene ( 4 ) is monitored with stationary and broadband transient absorption spectroscopy. The electron affinity of the substituents correlates with the shift of the absorption band. The weak extinction of 3 complicates data interpretation, but comparison with earlier measured 1,1′-dimethylstilbene ( 1 ) and 1,1′-diethylstilbene ( 2 ) helps to assign transient spectra and relaxation paths. For 3 a long-lived perpendicular state P is observed with lifetime τ P = 134 ps in acetonitrile. For 4 τ P = 2.1 ps in acetonitrile and 27 ps in n-hexane, the difference indicating a substantial dipole moment (∼3D) of the …
CCDC 177377: Experimental Crystal Structure Determination
Related Article: H.Detert, D.Lenoir, H.Zipse|2009|Eur.J.Org.Chem.|2009|1181|doi:10.1002/ejoc.200801076
CCDC 684678: Experimental Crystal Structure Determination
Related Article: H.Detert, D.Lenoir, H.Zipse|2009|Eur.J.Org.Chem.|2009|1181|doi:10.1002/ejoc.200801076
CCDC 684679: Experimental Crystal Structure Determination
Related Article: H.Detert, D.Lenoir, H.Zipse|2009|Eur.J.Org.Chem.|2009|1181|doi:10.1002/ejoc.200801076
CCDC 251049: Experimental Crystal Structure Determination
Related Article: R.Herges, A.Papafilippopoulos, K.Hess, C.Chiappe, D.Lenoir, H.Detert|2005|Angew.Chem.,Int.Ed.|44|1412|doi:10.1002/anie.200461632