“…14 During our research project on design and synthesis of selective uorescent sensors, we became interested in spirobiuorene since it has high chemical and thermal stabilities with strong emission signal. 15 Several derivatives of spirobiuorene are used as materials in optoelectronic devices such as eld-effect transistors (FET), 16 phototransistors, 17 solar cells, 18 and organic light-emitting diodes. 19 There are a few examples of spirobiuorenes used as uorescent chemosensors for analytes such as nitric oxide, 20 H + , 21 Ag(I), 22 and Hg(II) ion.…”