Synthesis and characterization of a highly two-photon active dendrimer derived from 2,3,8-trifunctionalized indenoquinoxaline units

A Series of Imidazole Derivatives: Synthesis, Two-Photon Absorption, and Application for Bioimaging

“…In addition, triphenylamine group was utilized in optical material [ 21 – 23 ] due to a strong electron donor and effective conjugation length. Stryryl groups with excellent coplanarity are beneficial to increase effective conjugation length [ 24 , 25 ]. Based on the above considerations, at present work, in order to obtain the material with large 2PA cross section, imidazole, triphenylamine, and styryl group were used as link to construct the three D- π -A chromophores.…”

Multi-photon properties of branched chromophores derived from indenoquinoxaline and oxadiazole heterocyclic units

“…Aer ltration, the ltrate was concentrated in vacuo to afford crude product, which was puried by column chromatography on silica gel using ethyl acetate/hexane (1 : 5) to afford a red powder as the title product (0.56 g, 60%). 1 5.3.6 7-(5-(4-(tert-Butyl)phenyl)-1,3,4-oxadiazol-2-yl)-9,9-dihex yl-9H-uorene-2,3-diamine (9). To a mixture of compound 8 (0.56 g; 0.94 mmol) in ethyl acetate (20 mL) was added tin(II) chloride dihydrate (2.12 g; 9.4 mmol) and the whole system was heated to reux for 3 h. Aer cooled down to room temperature, the reaction mixture was poured into NaHCO 3(aq) and the resulting solution was ltered.…”

“…7 For the past few years, we have been focused on searching new and useful heterocyclic p-units for the development of efficient 2PAchromophores and have found that functionalized quinoxalinoids are benecial moieties for the enhancement of molecular 2PA. [8][9][10][11][12] Among these investigations, some of the quinoxalinoid systems were even found to manifest strong 3PA in both nanosecond and femtosecond time domain 11,12 and such experience has lead us to consider that it may be worthy to explore the potentiality of using quinoxalinoids as the building units for 3PA materials. Following this line of concept, herein we would like to present our combined studies of degenerate 2PA and 3PA, up-converted emission and order of the absorption process (OAP) across a spectral range of 680-1500 nm based on a set of new multi-branched chromophores derived from 2,3,8-trifunctionalized indenoquinoxalines and oxadiazoles in the femtosecond time domain.…”

Advances in Light‐Emitting Dendrimers

“…Very strong and widely dispersed 2PA was found to reach a maximum at around 740 nm (31 700 GM) indicating that 2,3,8‐trifuctionalized indenoquinoxaline units are useful building groups for the development of highly active 2PA‐dyes dendrimer 87 . In addition, this dendritic structure regulates the optical power of femtosecond laser pulses at 800 nm ( Figure ) …”

“…(Concentration 1 × 10 −6 m) Normalized 2PA‐induced fluorescence spectra (right). Reproduced with permission . Copyright 2014, The Royal Society of Chemistry.…”