- Chromogenic detection of hydrogen sulfide using squarylium-based chemosensors
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Squarylium-based colorimetric hydrogen sulfide (H2S) chemosensors (SQ1, SQ2, and SQ3) were developed, and their detection properties were systematically characterized. SQ1 exhibited rapid and high resolution H2S sensing properties th
- Chun, Hye W.,Jung, Daewoong,Kim, Jae Keon,Kim, Jong H.,Lee, Junyeop,Lee, Woosung,Noh, Ha Lim,Oh, Byeong M.,Park, Young Ki,Zheng, Jian
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- Aggregation of squaraine dyes: Structure-property relationships and solvent effects
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In characterizing the UV-visible absorption properties of a series of seven anilino class squaraine dyes in dimethyl sulfoxide (DMSO)-water mixtures, spectral features characteristic of aggregation were observed.These included hypsochromic and hypochromic
- McKerrow, Andrew J.,Buncel, Erwin,Kazmaier, Peter M.
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p. 1605 - 1615
(2007/10/02)
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- Squaraine chemistry. A new approach to symmetrical and unsymmetrical photoconductive squaraines. Characterization and solid state properties of these materials
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A new approach to 1-(p-dimethylaminophenyl)-2-hydroxycyclobutene-3,4-dione (4), a precursor for the synthesis of symmetrical and unsymmetrical photoconductive squaraines, is described.In situ generation of p-nitrophenyl ketene, by the reaction of p-nitrop
- Law, Kock-Yee,Bailey, F. Court
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p. 494 - 505
(2007/10/02)
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- Squaraine chemistry. Synthesis of bis(4-dimethylaminophenyl)squaraine from dialkyl squarates. Mechanism and scope of the synthesis
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The mechanism and the scope of the synthesis of bis(4-dialkylaminoaryl)squaraines from di-n-butyl squarate and N,N-dialkylanilines have been studied.Results show that water and acid are key factors of the synthesis, and these two factors have been optimized.Yields of squaraine are also found to be sensitive to the steric effect provided by the alkyl chain in dialkyl squarates as well as to the concentration of the aniline reagent used in the synthesis.Mechanistic results suggest that alkyl squarate is the precursor of the synthesis, and that squaraine is formed by diarylation of alkyl squarate with and N,N-dialkylaniline derivative.Under optimized conditions, a number of squaraines have been synthesized.Yields, which are comparable to those synthesized from squaric acid, are obtained.Product analysis with good material balance has been achieved, and results show that arylation and diarylation of the starting di-n-butyl squarate are major side reactions in the squaraine synthesis.
- Law, Kock-Yee,Bailey, F. Court
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p. 2267 - 2273
(2007/10/02)
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