Synthesis and Optical Properties of Heptamethine Indolenine Cyanine Dyes Containing Various Counter Anions
Vol. 59, No. 5, pp. 264-270,
Oct. 2022
10.12772/TSE.2022.59.264
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Abstract
Cyanine dyes exhibit excellent spectral properties, featuring broad wavelength
tunability and a high absorption coefficient. However, for optimal spectral properties, they
need to retain a monomeric state, which alleviates aggregation. Herein, we present the
synthesis and properties of hexyl-substituted heptamethine indolenine cyanine dye containing
various anions. The prepared cyanine dye exhibited strong absorption properties at
approximately 800 nm in the near-infrared region. Different counter anions, including bromide
(Br), tetrafluoroborate (BF4), bis(trifluoromethanesulfonyl)imide (TFSI), and tetrakis
(pentafluorophenyl)borate (TPFB), were incorporated to examine the effect on the aggregational
and resulting optical behaviors. Among these, the cyanine with TPFB anions
showed a preferential monomeric peak in the UV-Vis spectra, indicating that the large TPFB
anion acts as a potent aggregation inhibitor. Furthermore, the photothermal performance
of the cyanine dye with the TPFB anion was evaluated, exhibiting a suitable temperature
profile, kinetic stability, and photothermal conversion efficiency. Furthermore, the cyanide
sensing response was examined, with the prepared cyanine dyes exhibiting high binding
constants and low detection limits.
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