The Absorption Spectrum of Malachite Green Leucocyanide and the Mechanism of the Dark Reaction after Photolysis

Ultrafast dynamics of photochromic compound based on oxazine ring opening

“…The concentrations of pNph and pNphe solutions, used in our experiments, were 0.5 and 0.25 mM respectively. Photochromic compound IB1a (5a,6,6-trimethyl-2-nitro5a,6-dihydro-12H-indolo [2,1-b] [1,3]benzoxazine) was synthesized according to the procedure described earlier [15]. Solutions of IB1a in MeCN with the corresponding concentrations of ∼0.8 and 1.9 mM were used respectively for fs pump-probe and ns flashphotolysis measurements.…”

“…Despite the early discovery of photochromism [1,2] and continuous research efforts in this field [3][4][5][6][7], photochromic molecular compounds still attract ample attention due to their distinctive properties. These include the ability to change absorption spectra and / or refractive index [8], modulating molecular fluorescence yield [9] and optically inducing structural changes in supramolecular complexes [10][11][12].…”

“…One of the newly synthesized [15][16][17] groups of photochromic compounds are indolo [2,1-b] [1,3]benzoxazines. These photochromes undergo a fast C-O bond cleavage upon UV excitation which results in the formation of two distinct chromophoric groups [18,19].…”

“…In this paper, we present a study on a compound with the simplest chemical structure from the group of indolo [2,1-b] [1,3]benzoxazines (IB1 in Fig. 1).…”

“…Thus, in our transient absorption studies, we compare ultrafast responses of IB1 with those of its model compounds, representing two chromophoric groups comprising the photoswitch. To our knowledge, this is the first attempt to investigate ultrafast dynamics in the family of indolo [2,1-b] [1,3]benzoxazine photochromes.…”