Spectroscopic study on the photoinduced reaction of fullerene C-60 with aliphatic amines and its dynamics - strong short wavelength fluorescence fromthe adducts

The photoinduced electron donor acceptor interactions of C-60 with eight ki nds of aliphatic amines, namely diethylamine (DER), triethylamine (TEA), tr i-n-amylamine (TAA), propylethylamine (PPA). n-butylamine (BTA), n-heptylam ine (HPB) and dodecylamine (DDA) and ethylenediamine (EDA) are reported by a comprehensive spectroscopic study. Experiments show that there is a good discipline with different structure and the length of n-alkyl group both in their. ground and excited states. At the same time, a slow reaction takes place between C-60 and various amines with a gradual increase in the concen tration of various aliphatic amines or the standing of solution, which can be dramatically catalyzed by UV-radiation. The final products can all emit a strong fluorescence at the relatively shorter wavelength around 519 nm. O n this basis, the dynamic propel ties of C-60/aphaliticamines including the enthalpy of activation (DeltaH(et)(not equal)) and entropy activation (Del taS(et)(not equal)) together with all sorts of influence factors are firstl y investigated in this work. The possible reaction mechanisms are explored, also. (C) 2001 Elsevier Science B.V. All rights reserved.