Imaging Science and Photochemistry ›› 1985, Vol. 3 ›› Issue (3): 32-38.DOI: 10.7517/j.issn.1674-0475.1985.03.32
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TANG YING-WU, CAO WEI, SONG XIN-QI, LIU WEN-YUAN, ZHANG FU-SHI
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Abstract: The absorption spectra of 16, cyanine dyes in 18 solvents of various refractive index and polarity have been investigated in this work. It was found that the positive sol-vatochromism of the M-band of the molecules was not only dependent upon the refractive index n of the solvent used, but also on the dielectric constant ε. In correlating the band shift (in cm-1) with the function f(n,ε) = (n2-1/2n2+1) + α(ε-1/ε+2) better linearity has been obtained. The parameter a in this function has a value less than unity, its sign was determined by the sign of solvatochromism of the system studied. In water containing bi-liquid system, the negative solvatochromism of the dimeri-zed dye molecules was also in good linearity with solvent molecules, the dimerized dye molecules can be treated as an isolated optical element.
TANG YING-WU, CAO WEI, SONG XIN-QI, LIU WEN-YUAN, ZHANG FU-SHI. SOLVENT EFFECT TO CYANINE DYES[J]. Imaging Science and Photochemistry, 1985, 3(3): 32-38.
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