Hybrid Molecules Based on Fullerene C60 and Dithienylethenes. Synthesis and Photochromic Properties. Optically Controlled Organic Field-Effect Transistors

Hybrid molecules based on fullerene C₆₀ and dithienylethene and its perfluorinated analog not inferior in the efficiency of phototransformations to the initial photochromic compounds were synthesized for the first time. The resulting pyrrolidinofullerenes containing photochromic moieties were used to fabricate organic field-effect transistors (OFETs) with output and transfer characteristics ten times exceeding similar characteristics of devices based on staring dithienylethenes. It was found that OFETs based on hybrid molecules with dithienylethenes are four times less efficient than devices based on hybrid molecules with perfluorinated analogs.

Novel Photoswitchable Dihetarylethenes Exhibiting Fluorescence

Photochromic bridged dihetarylethenes exhibiting photochromism were synthesized. The synthesized coumarinyl(thienyl) thiazoles also display light regulated fluorescence in their open form. When the open form is irradiated with UV-light of wavelength less than 400 nm, a significant decrease in fluorescence intensity is observed due to cyclisation. Again, when the cyclised isomeric form is irradiated with visible light of wavelength greater than 470 nm the open form along with fluorescence is recovered. This reversible photo switching behaviour of dihetarylethenes may make them to be used as photo regulators. This phenomenon is also supported by DFT calculations.

Interaction of 4-oxoalkane-1,1,2,2-tetracarbonitriles with Lawesson's reagent – a new approach to the synthesis of 2,2′-disulfanediylbis(1H-pyrroles). The synthesis of photochromic diarylethene with a disulfide bridge

Transformation of 4-oxoalkane-1,1,2,2-tetracarbonitriles under the action of Lawesson's reagent leads to 2,2′-disulfanediylbis(1H-pyrrole-3-carbonitriles) in good yields.