α-Cyclodextrin Functionalized Carbon Dots: Pronounced Photoinduced Electron Transfer by Aggregated Nanostructures

Abstract

In recent past assembly of α-cyclodextrin (α-CD) functionalized carbon dots (α-CD-CDots) has been used in molecular recognition. These assemblies are effectively used for optical sensing by the help of electron transfer mechanism. Photoinduced electron transfer (PET) between CDots and surface-encapsulated derivatives of methyl viologen (MV 2+ ) is used in the present work to follow the effect of the aggregated nanostructures. Formation of the nanoaggregates was confirmed by fluorescence anisotropy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). These aggregated nanostructures are found to reinforce the electron transfer dynamics between CDots and MV 2+ . PET was confirmed from steady-state and time-resolved fluorescence along with ultrafast transient absorption measurements. The present work elaborates kinetic details of PET in the formed nanotubular aggregates. The reported concepts may be prospective toward development of light energy conversion devices.

Application of Photoinduced Electron Transfer with Copper Nanoclusters toward Finding Characteristics of Protein Pockets

“…PET from metal NCs to MVs is well known, and plenty of works are reported in this area. 28−30 The three derivatives exhibit difference in the extent of electron acceptance from a common donor because of the presence of the attached hydrophobic chains and hence variation in the electron deficiency at the acceptance center. The initial PET experiments with the Cu NCs and the MV derivatives were performed to estimate their respective PET capacity so that it can be compared with those obtained in the presence of BSA.…”

Carbon dots functionalized papers for high-throughput sensing of 4-chloroethcathinone and its analogues in crime sites

“…Table 1 summarizes the values of their HOMO, LUMO and energy gap, revealing that the LUMO levels of 4-chloroethcathinone and cocaine are lower than that of C-dots. Thus, electron transfer from the C-dots to the two chemicals could occur, supporting the PL quenching through electron transfer [60][61][62][63]. Moreover, to further support the electron transfer mechanism, 4chloroethcathinone (27.8 mM) reacted with sodium borohydride (0.1 M) prior to its addition to the C-dot solution at pH 11.0.…”

Long-range light-modulated charge transport across the molecular heterostructure doped protein biopolymers

“…[20][21][22][23][24] In terms of their ET properties, C-Dots have been used as both electron donors as well as electron acceptors. 20,[25][26][27][28][29] While we mainly use the C-Dot here as a photosensitizer, i.e., a light-induced electron donor, it is important to state that the type of C-Dot that we use here also acknowledges superior PT efficiency to the BSA mat. 16 Besides being the electron acceptor, the hemin is used here also as a molecular dopant for the BSA mat due to its strong binding affinity, as well as a charge mediator capable to support long-range ET whereas holes are the charge carriers.…”