J.D. Kimball, et al., “BODIPY–BODIPY Dyad: Assessing The Potential As A Viscometer For Molecular And Ionic Liquids,” Royal Society of Chemistry Advances, 2015, 5, 19508-19511
(Joseph D. Kimball, Sangram Raut, Laramie P. Jameson, Nicholas W. Smith, Zygmunt Gryczynski, and Sergei V. Dzyuba)

Abstract: A symmetrical BODIPY–BODIPY dyad with a diyne linker was prepared in two steps; the lifetime decay of this rotor appeared to correlate with the viscosity of the media, thus making this dyad a suitable small molecule viscometer for molecular solvents. The potential of using the rotor to probe the viscosity of ionic liquids was also investigated.