174278-69-4Relevant academic research and scientific papers
Linear free-energy relationship for electron-transfer processes of pyrrolidinofullerenes with tetrakis(dimethylamino)ethylene in ground and excited states
Luo, Chuping,Fujitsuka, Mamoru,Huang, Chun-Hui,Ito, Osamu
, p. 2923 - 2928 (1999)
Systematic studies of electron-transfer processes in the ground states and excited triplet states of pyrrolidinofullerenes {C60(C3H6N)R [R = H (1), p-C6H4NO2 (2), p-C6H4CHO (3), p-C6H5 (4), p-C6H4Me (5), p- C6H4NMe2 (6)]} with tetrakis(dimethylamino)ethylene (TDAE) have been carried out by steady-state and transient absorption measurements in the visible-NIR region. Analyses of the equilibria of the electron-transfer processes in the ground states indicate that free ion radicals are produced in polar solvents. Photoinduced electron-transfer processes via (T)(C60(C3H6N)R)* were observed by applying a perturbation to the equilibria of the electron-transfer reactions in the ground states by laser flash photolysis. Based on the relationship of the thermodynamic data and kinetic data, the electron-transfer rate constants in the ground states (k(et)/(G)) can be evaluated. The k(et)/(G) values are affected by the substituents to a smaller extent compared with the equilibrium constants (K) in polar solvents; α = 0.6 in Δ log k(et)/(G) = α Δ log K. This α value indicates that the activation energies of forward electron transfer in the ground states vary moderately with the thermodynamic stabilities of (C60(C3H6N)R).-. Electron-transfer rate constants via (T)(C60(C3H6N)R)* which are close to the diffusion-controlled limit, do not show a large substituent effect (α = 0), because of their highly exothermic processes. Such a linear free-energy relationship can be extended to other systems such as (T)(C60(C3H6N)R)*/N,N-dimethylaniline, from which valuable information for electron-transfer processes can be obtained.
Synthesis, Langmuir-Blodgett deposition and optical characterization of a 4-acetalphenyl-substituted C60-pyrrolidine derivative C60(C12H17NO2)
Zhou, Dejian,Ashwell, Geoffrey J.,Rajan, Rakesh,Gan, Liangbing,Luo, Chuping,Huang, Chunhui
, p. 2077 - 2081 (2007/10/03)
A new 4-acetalphenyl-substituted C60-pyrrolidine derivative, C60(C12H17NO2) (1), has been prepared and its Langmuir films, with and without 22-tricosenoic acid [CH2=CH-(CH2)20CO2H (TA)], at the air/water interface have been investigated. Pure 1 forms monolayers more easily than the parent molecule, C60, and can be transferred onto solid substrates to form Langmuir-Blodgett (LB) films. The mixed Langmuir films of 1 and TA were transferred onto hydrophilically pretreated quartz, glass substrates and silicon wafers. Reflectometric measurement of a 63-layer 1 : 2 mixed film on a silicon wafer using an He-Ne laser (λ = 632.8 nm) provided a film thickness and refractive index of 171 nm and 1.73, respectively. Weak second harmonic generation (SHG) from LB monolayers of pure 1 and 1 : 2 and 1 : 4 mixed LB monolayer films of 1 and TA was observed. The second-order susceptibilities, χpp(2), were evaluated to be in the range (4-6) × 10-9 esu.
