TLC was performed on silica gel GF256 (Merck).PFPE was spotted on a TLC plate and TLC plate was developed in a beaker or closed jar.Then,a small amount of mobile phase was placed in the container.The obtained chromatogram was revealed with Dra-gendroff'sreagent. Then,PFPE was analyzed by 1H NMR technique, and spectra were recorded in CDCl3 on a 300-MHz spectrometer
(Avance300,Bruker,Germany).