Picosecond cyclization reaction dynamics of furan-based diarylethene with thiosemicarbazone side-chain groups

Abstract

Picosecond cyclization reaction dynamics of furan-based photochromic diarylethenes with thiosemicarbazone side-chains were studied by femtosecond transient absorption spectroscopy. The monitored ring-closing reaction in the time range of 0+1100 ps is characterized by two main stages. First stage proceeds during the first 1.1 ps and is associated mainly with redistribution of rr -rr molecular orbitals of excited open-ring molecules which consequently leads to the formation of excited closed-ring molecules. During the next 300 ps, a long-term relaxation via vibrational cooling of closed-ring form occurs. The obtained relaxation dynamics curve was fitted by an exponential decay function with 68 ps time constant.

Optical properties of gold nanoparticles decorated with furan-based diarylethene photochromic molecules

“…-extended wires) is dominating the level alignment with respect to the Fermi-level of the electrode material. Moreover, we could also show that DAE with difurylethene-based photochromic core and suitable anchoring groups switch from the OF to the CF within the picosecond [36] or even sub-picosecond [37] timeregime. Using these findings, flexible molecular devices based on the YnPhT DAE were designed and showed reversible conductance switching ( Fig.…”

E/Z photoisomerization pathway in pristine and fluorinated di(3-furyl)ethenes

“…Such bridges include cyclopentene, 60 perfluorocyclobutene, 61 and, most commonly, perfluorocyclopentene. The compounds with the latter have been studied in solution, 45,[62][63][64][65] linked to Au nanoparticles 66,67 or Au surface, 68 and in devices with mechanically controlled break junctions. 69,70 Cyclization in pristine DFE 71,72 and 1,2-methyl substituted DFE 73 has been considered as well.…”

Ultrafast ring-closing reaction dynamics of a photochromic furan-based difurylethene

“…Consequently, the combination of femtosecond time-resolved spectroscopy with TD-DFT calculations was found highly efficient for investigating of the ultrafast photoinduced ring-closing reaction [21,26,27]. Therefore, DAEs with various functional side chain groups were synthesized and are discussed in the literature recently [28][29][30][31][32], aiming at finding suitable side-chain groups to link DAEs with metallic electrodes. We recently developed furan-based diarylethenes with sulfur-free photochromic core and differently substituted p-conjugated side chains for application in single molecule-metal junction experiments [14,33].…”