[PDF]    http://dx.doi.org/10.3952/lithjphys.48311

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 48, 231–242 (2008)


ULTRAFAST DYNAMICS OF PHOTOCHROMIC COMPOUND BASED ON OXAZINE RING OPENING
M. Barkauskasa, V. Martynaitisb, A. Šačkusb, R. Rotomskisa, V. Sirutkaitisa, and M. Vengrisa
aDepartment of Quantum Electronics, Vilnius University, Saulėtekio 10, LT-10223 Vilnius, Lithuania
E-mail: martynas.barkauskas@ff.vu.lt
bInstitute of Synthetic Chemistry, Kaunas University of Technology, Radvilėnų 19, LT-50254 Kaunas, Lithuania

Received 17 August 2008; revised 17 September 2008; accepted 18 September 2008

We have performed a femtosecond pump-probe and nanosecond flash-photolysis measurements on a new type of photochromic molecules. These photochromes incorporate an indolo[2,1-b][1,3]benzoxazine ring system which opens upon UV light excitation and closes back within a few tens of ns. The details of ring opening and spectral properties of the photoproducts have been studied by investigating the spectral signatures of the model compounds representing separate structural parts of the photochromic switch. Comparison of the photoinduced dynamics of the model compounds and those of photochromic molecule has revealed a detailed molecular picture of the light-driven switch function.
Keywords: photochromism, pump-probe, flash-photolysis, indolo[2,1-b][1,3]benzoxazine, 4-nitrophenol, 4-nitrophenolate, 3H-indolium iodide, transient absorption, ring opening
PACS: 33.20.Kf, 82.53.Hn, 82.53.Uv


FOTOCHROMINIO JUNGINIO SU ATSIDARANČIU OKSAZINO ŽIEDU ULTRASPARČIOJI DINAMIKA
M. Barkauskasa, V. Martynaitisb, A. Šačkusb, R. Rotomskisa, V. Sirutkaitisa, M. Vengrisa
aVilniaus universitetas, Vilnius, Lietuva
bKauno technologijos universiteto Sintetinės chemijos institutas, Kaunas, Lietuva

Atlikti femtosekundiniai žadinimo ir zondavimo bei nanosekundiniai žybsnio fotolizės eksperimentai su naujai susintetintais molekuliniais fotojungikliais. Šiuose fotojungikliuose yra oksazino žiedas, kuris atsidaro molekulei sugėrus UV srities fotoną, o po to per keletą dešimčių nanosekundžių vėl užsidaro. Tirta žiedo atsidarymo dinamika ir spektrinės fotoproduktų savybės, lyginant laikinės spektroskopijos eksperimentus, atliktus su fotojungikliu, su eksperimentais, atliktais su modeliniais dariniais, atitinkančiais atskiras fotojungiklio grupes. Palyginus gautus rezultatus, pasiūlyta detali molekulinio mechanizmo, lemiančio fotochromiškumą, schema.


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