[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
Martynas Barkauskasa, Vytas Martynaitisb,
Algirdas Šačkusb, Ričardas Rotomskisa,
Valdas Sirutkaitisa, and Mikas 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
Martynas Barkauskasa, Vytas Martynaitisb,
Algirdas Šačkusb, Ričardas Rotomskisa,
Valdas Sirutkaitisa, Mikas 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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