Syntheses of Negative Photochromic Crowned Spirobenzopyrans
摘要:
Two synthetic routes to negative photochromic spirobenzopyrans bearing a monoazacrown moiety at the 8-position were described and compared. Method B gives much higher total yield than method A.
One-Pot Synthesis of 6′-Amino-Substituted Spirooxazines
作者:O. A. Fedorova、A. V. Koshkin、V. Lokshin、A. Samat、S. P. Gromov
DOI:10.1055/s-2005-870006
日期:——
A one-pot synthesis of 6'-amino-substituted spiroindolinonaphth[2,1-b][1,4]oxazines is developed through the condensation of 2-methylene-1,3,3-trimethylindoline derivatives and 1-amino-2-naphthol in the presence of different secondary amines and oxidizing agents using methanol or toluene as the solvent. The main advantage of the method is its simplicity, and starting from readily accessible reagents
[EN] SPIRO[INDOLINE-[2,3']-BENZOXAZINE]-TYPE PHOTOCHROMIC COMPOUNDS CONTAINING A 6'-CYANO OR PHENYLSULPHONYL GROUP AND WITH A 7', 8'-CONDENSED BENZENE RING IN THE BENZOXAZINE RING AND USE OF SAME IN OPHTHALMIC OPTICS<br/>[FR] COMPOSES PHOTOCHROMIQUES DE STRUCTURE SPIRO[INDOLINE-[2,3']-BENZOXAZINE] A GROUPEMENT CYANO OU PHENYLSULFONYL EN 6' ET COMPORTANT UN CYCLE BENZENIQUE CONDENSE EN 7', 8' DU NOYAU BENZOXAZINE, ET LEUR UTILISATION DANS LE DOMAINE DE L'OPTIQUE OPHTALMIQUE
申请人:ESSILOR INTERNATIONAL COMPAGNIE GENERALE D'OPTIQUE
公开号:WO1996004590A1
公开(公告)日:1996-02-15
(EN) 6'-cyano or phenylsulphonyl-substitued spiro[indoline-[2,3']-benzoxazine]-type photochromic compounds, wherein said cyano or phenylsulphonyl group is bound to the 6' carbon atom by the sulphur atom, and having a 7', 8'-condensed benzene ring, and use of same in ophthalmic optics.(FR) L'invention est relative à des composés photochromiques de structure spiro[indoline-[2,3']-benzoxazine] substitués en position 6' par un groupement cyano ou phénylsulfonyl lié par l'atome de soufre au carbone en 6' et comportant un cycle benzénique condensé en 7', 8' et leur utilisation dans l'optique ophtalmique.
Squaraine-Based Polymer Dots with Narrow, Bright Near-Infrared Fluorescence for Biological Applications
作者:I-Che Wu、Jiangbo Yu、Fangmao Ye、Yu Rong、Maria Elena Gallina、Bryant S. Fujimoto、Yong Zhang、Yang-Hsiang Chan、Wei Sun、Xing-Hua Zhou、Changfeng Wu、Daniel T. Chiu
DOI:10.1021/ja5123045
日期:2015.1.14
This article describes the design and development of squaraine-based semiconducting polymer dots (Pdots) that show large Stokes shifts and narrow-band emissions in the near-infrared (NIR) region. Fluorescent copolymers containing fluorene and squaraine units were synthesized and used as precursors for preparing the Pdots, where exciton diffusion and likely through-bond energy transfer led to highly bright and narrow-band NIR emissions. The resulting Pdots exhibit the emission full width at half-maximum of similar to 36 nm, which is similar to 2 times narrower than those of inorganic quantum dots in the same wavelength region (similar to 66 nm for Qdot705). The squaraine-based Pdots show a high fluorescence quantum yield (QY) of 0.30 and a large Stokes shift of similar to 340 nm. Single-particle analysis indicates that the average per-particle brightness of the Pdots is similar to 6 times higher than that of Qdot705. We demonstrate bioconjugation of the squaraine Pdots and employ the Pdot bioconjugates in flow cytometry and cellular imaging applications. Our results suggest that the narrow bandwidth, high QY, and large Stokes shift are promising for multiplexed biological detections.
Gruda,I.; Leblanc,R.M., Canadian Journal of Chemistry, 1976, vol. 54, p. 576 - 580