Synthesis of New Mono- and Bis- Photochromic Compounds Based on Isatins

Among various photochromic compounds, 1,3-diazabicyclo[3.1.0]hex-3-ene derivatives are the subject of intense research due to their photochromic behavior even in the crystalline state, although molecules which show photochromic reactivity in the crystalline state are rare. In this research synthesis of several mono- and bis-1,3-diazabicyclo[3.1.0]hex-3-enes with isatin linkage are enclosed. All synthesized compounds undergo reversible photochromic reactions not only in the solution but also in crystalline state by irradiation with UV light (254 nm). Keywords: Photochromic, Isatin, Bis-1,3-diazabicyclo[3.1.0]hex-3-en