Experimental and theoretical study of a new C10N8 compound. Reversible photoisomerization between 2,3,6,7-tetracyano-1,4,5,8-tetraazanapthalene and 4,5,9,10-tetracyano-1,3,6,8-tetraazacyclodeca-1,2,4,6,7,9-hexaene in low-temperature rare-gas matrices

✍ Scribed by Nobuyuki Akai; Satoshi Kudoh; Munetaka Nakata

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 217 KB
• Volume: 375
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)00924-2

✦ Synopsis

Reversible photoisomerization of 2,3,6,7-tetracyano-1,4,5,8-tetraazanaphthalene (TTN) in low-temperature rare-gas matrices was investigated by electronic absorption and Fourier transform infrared (FTIR) spectroscopies aided bydensity-functional-theory (DFT) calculations. The reactant, TTN, was found to change to 4,5,9,10-tetracyano-1,3,6,8tetraazacyclodeca-1,2,4,6,7,9-hexaene (TTH) upon ultraviolet-light irradiation, while the product, TTH, returns to the original reactant, TTN, upon visible-light irradiation. The time-dependent DFT calculation led to the conclusion that the forward and backward photoisomerizations occur by way of the S 3 -S 0 transition of TTN and the S 1 -S 0 transition of TTH, respectively.