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Emission Switching in the Near-Infrared by Reversible Trans-Cis Photoisomerization of Styrylbenzene-Conjugated Osmium Terpyridine Complexes.
Inorg Chem
April 2021
Department of Chemistry, Inorganic Chemistry Section, Jadavpur University,Kolkata 700032, India.
A new array of homoleptic osmium(II) complexes based on styrylbenzene-conjugated terpyridine ligands (tpy-pvp-X) were synthesized and their photophysical, electrochemical, and photoisomerization behaviors thoroughly investigated in this work. Both electron-donating and -withdrawing substituents were incorporated onto a tpy-pvp-X (X = H, Me, Cl, NO, and Ph) moiety to tune the optical properties and also the rate of photoisomerization behaviors in the complexes. All complexes display strong spin-allowed singlet metal-to-ligand charge-transfer bands in the visible (495-506 nm) and weak singlet ground state to triplet metal-to-ligand charge-transfer (MLCT) broad bands within the 600-700 nm range.
View Article and Find Full Text PDFPhotoisomerization dynamics of trans-trans, cis-trans, and cis-cis diphenylbutadiene from broadband transient absorption spectroscopy and calculations.
J Chem Phys
June 2020
Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany.
The photoisomerization path and dynamics of trans-trans (ttD), cis-trans (ctD), and cis-cis (ccD) 1,4-diphenyl-1,3-butadiene (DPB) in solution are studied with broadband transient absorption (TA) spectroscopy and quantum chemical calculations. For ttD in n-hexane, 2-photon-excited TA spectra indicate that the 2A state is located above 1-photon allowed 1B (S) by ∼1000 cm. Following S → S optical excitation, the isomerization occurs via torsion about a butadiene double bond to perpendicular molecular configuration P.
View Article and Find Full Text PDFStructural Elucidation of cis/trans Dicaffeoylquinic Acid Photoisomerization Using Ion Mobility Spectrometry-Mass Spectrometry.
J Phys Chem Lett
April 2017
Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory , Richland, Washington 99354, United States.
Due to the recently uncovered health benefits and anti-HIV activities of dicaffeoylquinic acids (diCQAs), understanding their structures and functions is of great interest for drug discovery efforts. DiCQAs are analytically challenging to identify and quantify since they commonly exist as a diverse mixture of positional and geometric (cis/trans) isomers. In this work, we utilized ion mobility spectrometry coupled with mass spectrometry to separate the various isomers before and after UV irradiation.
View Article and Find Full Text PDFEffect of strain on the photoisomerization and stability of a congested azobenzenophane: a combined experimental and computational study.
J Phys Chem A
November 2006
Dipartimento di Chimica 'G. Ciamician', Università di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy.
The stability and trans-cis photoisomerization properties of a macrocycle constituted of two para-aminoazobenzene units connected by two methylene bridges have been investigated by a combination of experimental and computational techniques. Irradiation at 365 nm leads to a photostationary state in which only 50% of the azobenzene units have isomerized, in contrast with the behavior of para-aminoazobenzene, whose photoconversion is larger than 80%. In the case of the macrocycle, a faster cis --> trans thermal back-reaction is observed.
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