Charge recombination reactions in photoexcited fullerene C60-amine complexes studied by picosecond pump probe spectroscopy

Design and photochemical study of supramolecular donor–acceptor systems assembled via metal–ligand axial coordination

“…The fullerene C 60 absorbs strongly in the UV region with molar extinction coefficient 100,000 M -1 cm -1 observed at 263 and 343 nm and a very weak absorption in visible region with molar extinction coefficient of 710 M -1 cm -1 . Photoexcitation of C 60 yields singlet excited 1 C 60 * that quantitatively converts to triplet excited 3 C 60 * [79][80][81][82]. Incorporating functional groups on C 60 to enhance its solubility in common organic solvents has been achieved through a wide variety of addition reactions [21].…”

Interaction of Ground and Excited (S1) States of C60 and C70 with Aromatic Amines: Exciplex and Charge-Transfer Emissions

“…Picosecond laser flash photolysis of these complexes have demonstrated interesting chargeseparation (CS) and charge-recombination (CR) reactions. 21,22 During the past few years many interesting observations have been reported on the interaction of the excited (S 1 ) state of the fullerenes with the amine donors. 1,2,[21][22][23][24][25][26] Wang 26 first observed that the S 1 state of C 70 interacts with N,N-dimethylaniline (DMAN) to form an exciplex in a nonpolar solvent hexane (HX).…”

Solution phase photophysics of 5,7-dimethoxy-2,3,4,9-tetrahydro-1H-carbazol-1-one: Analysing the lineaments of a new fluorosensor to probe different micro-environments

“…This indicates the presence of a new species in presence of TEA. According to the literature report, the hump around 390 nm can be assigned [76] to TEA þ . As the concentration of TEA gets higher, the absorbance in the range 520-630 nm increases to a large extent.…”