Kimura, Takeshi published the artcilePreparation and Optical and Electrochemical Properties of Boron (III) Subphthalocyanines with One to Three Trithiole Rings, Synthetic Route of 91-15-6, the main research area is boron subphthalocyanine trithiole ring preparation electrochem redox emission ESR.
The reaction of 5,6-dicyano-4,7-diethylbenzo[1,2,3]trithiole (1) with trichloroborane in p-xylene and subsequent substitution of the chloro group with phenol produced boron subphthalocyanine (2) with three trithiole rings. Upon treatment of 1 with trichloroborane in p-xylene in the presence of unsubstituted phthalonitrile or tetrafluorophthalonitrile, unsym. subphthalocyanines (3, 4, 6, and 7) with one or two trithiole rings were obtained after the reaction with phenol. The Q-band absorption of 2 appeared at λmax = 611 nm in the UV-visible spectrum and the emission was observed at λe = 630 nm. Decreasing the number of fused trithiole rings and Et groups resulted in higher energy shifts of the Q-band absorption in the UV-visible spectra and downfield chem. shifts of the 11B NMR signals. Compounds 2-4 were treated by pentachloro antimonate in CH2Cl2, the solution of which showed strong ESR signals. The structures of simplified model compounds were optimized using the DFT method with the Gaussian 09 program at the B3LYP/6-31G (d, p) level.
European Journal of Inorganic Chemistry published new progress about ESR (electron spin resonance). 91-15-6 belongs to class nitriles-buliding-blocks, name is Phthalonitrile, and the molecular formula is C8H4N2, Synthetic Route of 91-15-6.
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts