Add time:08/22/2019         Source:sciencedirect.com

A new cycloruthenated 2-(2-thienyl)pyridine complex (1) with a benzo[e]indolium block was successfully synthesized and characterized, which has good water-solubility and displays a maximum absorption band centered at 730 nm (ε = 6.3 × 103 M−1 cm−1) in water. Moreover, its absorption edge can extend to 1000 nm. When either HSO3– or SO32– ions were added to the buffer solutions of 1, obvious color changes from dark-red to purplish-red were observed. However, it is noticeable that the addition of HSO3– ions resulted in the solution color of this complex changing from dark-red to colorless other than purplish-red. The different solution color changes displayed that 1 can be used as an optical chemo-sensor to distinguish HSO3– from SO32– in pure water.

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