Photoinduced interconversion ofcis- andtrans-isomers of bis(1,1,1-trifluoro-5,5-dimethyl-2,4-hexadionato)platinum(ii) studied by dynamic NMR spectroscopy

NMR in photo‐induced chemical exchange systems. Double‐resonance inverse fractional population transfer application for investigation of 1,2‐(2,2′‐dipyridyl)ethene photoisomerization kinetics

“…3). According to stilbene-like mechanism, this band could be attributed to (10aS,10bR)10a,10b,dihydro- [4,7]phenanthroline. It is the same product that was identified by NMR in the course of prolongated irradiation of deaerated solutions of I (Fig.…”

“…2 Ϫ e t/T1 [7] EXPERIMENTAL 1,2-(2,2Ј-dipyridyl)ethene was prepared by methods similar to (23). The 1 H NMR spectra were recorded by a Bruker MSL-300 and a Bruker DPX-200 spectrometers at 300.07 and 200.0 MHz, respectively.…”

“…2). Besides it was found that by-product (10aS,10bR)10a,10b,dihydro- [4,7]phenanthroline (II) was forming with smaller efficiency (see Fig. 2).…”

NMR application for a study of reversible photochemical kinetics: A multisite case

“…The solution of this problem is provided by the present work. It has been proposed (10-12) that reversible photoinduced molecular dynamic (PIMD) processes in solutions can be explored by DNMR spectroscopy (10)(11)(12). In particular, analytical expressions (13) were obtained recently describing the NMR signal shape for two-site exchange under condition of photoinduced chemical exchange (PICE).…”

NMR applications for a study of converted photochemical processes kinetics

“…Besides, photochemicaUy induced dynamic polarization of nucleus allows one to examine [2,3] the short-lived radical alternate corpuscles which appear as a result of flash photolysis of substances. Recently it was shown that with the help of dynamic NMR (DNMR), the reversible photochemical processes [6][7][8] can be investigated in situ. DNMR procedures on the basis of the comparison of the band shapes are promising for the study of photo-induced chemical exchange (PICE) [6][7][8].…”