Irradiation experiments involving photoswitches in toluene were conducted with a stand-alone xenon arc lamp system (Model: LB-LS/30, Sutter Instrument Co.) outfitted with a SMART SHUTTER controller (Model: LB10-B/IQ, Sutter Instrument Co.) and a liquid light guide LLG/250. 340 (part number: 340HC10-25) and 410 (part number: 410FS10-25) nm light filters purchased from Andover Corporation, were used in the irradiation experiments. UV-Vis spectra were recorded on a Shimadzu UV-1800 UV-Vis spectrophotometer.