Synthesis Of Fullerene Derivatives PCBM Isomers And Their Micro-nanostructures

Fullerenes and their derivatives possess high electron affinity and high electron mobility.To form micro-nanostructures by method of molecular self-assembly can achieve the use of this part of performance and extend the field of application of its properties.Therefore,the realization of the morphology orientation of fullerene micro-nanostructures is of great significance for the application of fullerene.In the research process of fullerene micro-nanostructures,researchs on most of empety fullerenes and a small part of metallofullerenes had reported.There is relatively less research on the regulation of the micro-nanostructure of fullerene derivatives.Therefore,from the perspective of the isomers of fullerene derivatives,this paper explores the link between the molecular differences of their derivatives and the differences of its micro-nanostructures.The main research results are as follows:?1?The synthetic routes of the two isomers[5,6]-PCBM and[6,6]-PCBM were optimized,and the two kinds of molecules were separated and purified.The commercial[6,6]-PCBM introduced and the synthetic target molecules[5,6]-PCBM and[6,6]-PCBM were compared by the characterization work of HPLC,MS,¹ HNMR and thermal analysis.It was confirmed that the target molecule[5,6]-PCBM molecule and[6,6]-PCBM molecule were successfully synthesized,separated and purified.In addtion,It was also proved by crystal characterization that the difference between[5,6]-PCBM molecule and[6,6]-PCBM molecule is the opening and closing of the[5-6]bond at the C₆₀ addition site.?2?Fristly,the way of the self-assembly of micro-nanostructures for[5,6]-PCBM and[6,6]-PCBM was found.Secondly,the difference of[5,6]-PCBM and[6,6]-PCBM in the micro-nano structure level was captured,which was analyzed by the scanning electron microscopy,high-resolution transmission electron microscopy,powder diffractometer,thermal analyzer and single crystal diffractometer.It was concluded that the difference reflected in the micro-nano structure level is the growth difference on the preferred growth surface,which causes the growth of[5,6]-PCBM molecules into nanosheets,and[6,6]-PCBM molecules into nanoneedles.Because the arrangement of four molecules of[5,6]-PCBM nanosheet is different from[6,6]-PCBM nanoneedle in their cystal unit cell,and the relative insertion position of the CS₂ molecule in the two unit cells is also different.?3?The photoelectric properties of[5,6]-PCBM and[6,6]-PCBM molecules and their micro-nano structures were explored.The photoluminescence performance and photoelectric response performance of[5,6]-PCBM and[6,6]-PCBM micro-nanostructures have greatly improved compared to pristine[5,6]-PCBM and[6,6]-PCBM.