3 years ago

Thermo-Chromium: A Contactless Optical Molecular Thermometer

Thermo-Chromium: A Contactless Optical Molecular Thermometer
Norman Scholz, Thomas Behnke, Sven Otto, Katja Heinze, Ute Resch-Genger
The unparalleled excited-state potential-energy landscape of the chromium(III)-based dye [1]3+ ([Cr(ddpd)2]3+; ddpd=N,N′-dimethyl-N,N′-dipyridin-2-yl-pyridin-2,6-diamine) enables a strong dual emission in the near infrared region. The temperature dependence of this dual emission allows the use of [1]3+ as an unprecedented molecular ratiometric thermometer in the 210–373 K temperature range in organic and in aqueous media. Incorporation of [1]3+ in biocompatible nanocarriers, such as 100 nm-sized polystyrene nanoparticles and solutol micelles, provides nanodimensional thermometers operating under physiological conditions. The unparalleled excited-state potential-energy landscape of the chromium(III)-based dye [Cr(ddpd)2]3+ (ddpd=N,N′-dimethyl-N,N′-dipyridin-2-yl-pyridin-2,6-diamine) enables a strong dual emission in the near infrared region. The temperature dependence of this dual emission allows its use as an unprecedented molecular ratiometric thermometer in the 210–373 K temperature range in organic and in aqueous media (see scheme).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701726

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