Synthesis and photophysical properties of side-chain chlorinated benzo[a]phenoxazinium chlorides

Synthesis, photophysical characterisation and photostability studies of NIR probes with aliphatic, aromatic and chlorinated terminals in 5- and 9-amino positions of benzo[ a ]phenoxazines

“…In that basic form the π-conjugation system would not be significantly changed resulting in a less blue shifted absorption than when the deprotonation occurs at the 5-position. As in previous studies [15,17], compound 5 shows that double alkylation at 9-position results in red shift of the acid form absorption.…”

“…In ethanol media, compound 5 which is di-alkylated at 9-aminoposition, shows a higher fraction of basic form. Globally, when comparing with similar compounds without a bulky group at the terminal of 5-amino position [15], it is possible to conclude that the bulky groups used in this study, significantly increase the fraction of basic form. The absorption spectra of compound 4a, possessing OH functionality at position 2, shows a very distinct behaviour.…”

“…Considering the importance and as a continuation of our current research interest towards the design, synthesis and application of NB derivatives with different substituents [15][16][17][18][19][20][21][22][23][24][25], the present work is focused in the preparation of a new set of benzo[a]phenoxazinium chlorides with aliphatic, aromatic and chlorinated terminals in 5-and 9-amino positions of the heteroaromatic system. The photophysical behaviour of these compounds in anhydrous ethanol and in aqueous solutions was investigated along with photostability studies in water and in biological medium.…”

<strong>Benzo[</strong><em><strong>a</strong></em><strong>]phenoxazinium chlorides functionalized with chloride atoms and/or ester groups</strong>

“…As a continuation of the investigation of our research group, [6][7][8][9][10] in this proceeding we intend to…”

Synthesis and Photophysics of New Benzophenoxazine Derivatives Fused with Julolidine

“…3 Moreover, they are useful as photosensitizers in photodynamic therapy, fluorophor in energy and electron-transfer reactions antitubercolastatic or anticancerogenic agents. 4 In the previous reports by our research group we have synthesised several NB derivatives, [5][6][7][8][9][10] and in the present communication we are interested to explore the properties of a rigid structure in comparison with the unrestricted dye. Herein, we report the synthesis of benzophenoxazinium derivaties fused with julolidine moiety.…”