93519-73-4Relevant academic research and scientific papers
Controlling two-step multimode switching of dihydroazulene photoswitches
Petersen, Anne U.,Broman, Soren L.,Olsen, Stine T.,Hansen, Anne S.,Du, Lin,Kadziola, Anders,Hansen, Thorsten,Kjaergaard, Henrik G.,Mikkelsen, Kurt V.,Nielsen, Mogens Brondsted
, p. 3968 - 3977 (2014)
We present the synthesis and switching studies of systems with two photochromic dihydroazulene (DHA) units connected by a phenylene bridge at either para or meta positions, which correspond to a linear or cross-conjugated pathway between the photochromes. According to UV/Vis absorption and NMR spectroscopic measurements, the meta-phenylene-bridged DHA-DHA exhibited sequential light-induced ring openings of the two DHA units to their corresponding vinylheptafulvenes (VHFs). Initially, the VHF-DHA species was generated, and, ultimately, after continued irradiation, the VHF-VHF species. Studies in different solvents and quantum chemical calculations indicate that the excitation of DHA-VHF is no longer a local DHA excitation but a charge-transfer transition that involves the neighboring VHF unit. For the linearly conjugated para-phenylenebridged dimer, electronic communication between the two units is so efficient that the photoactivity is reduced for both the DHA-DHA and DHA-VHF species, and DHA-DHA, DHA-VHF, and VHF-VHF were all present during irradiation. In all, by changing the bridging unit, we can control the degree of stepwise photoswitching.
Thiophene-containing monomers for the synthesis of new polythiopheneferrocenes
Rodlovskaya, E. N.,Vasnev, V. A.
, p. 1148 - 1150 (2020)
Synthesis of arylenebis(2-aminothiophene-3-carbonitriles) by the Gewald reaction was developed. The structures of the synthesized monomers were established by IR and NMR spectroscopy, mass spectrometry, and microanalysis. Polycondensation of these monomer
