Synthesis of C₇₀‐Based Fluorophores through Sequential Functionalization to Form Isomerically Pure Multiadducts

Abstract

Abstract Selective addition to the C 70 cage divides its π‐conjugated system into various smaller π‐conjugated systems with enhanced fluorescent properties. Key reactions include chlorination, methoxylation, ozonation, and Bingel or Bingel–Hirsch reactions. The maximum emission wavelength of the C 70 multiadducts ranges from 450 to 655 nm. Among the C 70 multiadducts, C 70 (OMe) 8 (C(COOEt) 2 ) 3 showed the highest quantum yield ( Φ F =0.18) and the largest Δ[ λ max (emission)− λ max (absorption)] (402 nm), with maximum emission at 655 nm.