Time-resolved IR spectroscopy of N-methylthioacetamide: trans-->cis isomerization upon n-pi and pi-pi excitation and cis-->trans photoreaction |
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Authors: | Cervetto Valentina Bregy Harald Hamm Peter Helbing Jan |
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Institution: | Physikalisch-Chemisches Institut, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland. |
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Abstract: | Time-resolved infrared spectroscopy was used to study the photoisomerization of N-Methylthioacetamide (NMTAA) in D2O in both the cis-->trans and the trans-->cis direction upon selective excitation of the n-pi (S1) and pi-pi (S2) electronic transitions. While isomerization and the return to the ground state takes place on two distinct time scales (cis isomerization is 30-40%, independent of the electronic state excited, while the cis-->trans isomerization proceeds with a 60-70% quantum efficiency. These results support a mechanism by which isomerization takes place via one common intermediate state independent of electronic excitation energy and initial conformation. |
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