Study On Morphology Control And Photophysical Properties Of Organic Micro-Nano Materials

This thesis reviewed the research progress of organic micro/nano-materials.In our previous research work,a series of materials such as Hbipo,7,7’-Hdmbipo-,8,8’-Hdmbipo-,boron-difluoride(BF2)complex and obip-CHO,etc,have been obtained,on this basis,organic micro/nano-material and organic radical materials are further researched.Firstly,the ultralong organic nanowires with high aspect ratio(>256)were firstly fabricated by a green vapor-solid reaction strategy.The organic nanowires reveal improved phosphorescent performance,which is attributed to high aspect ratio of nanowires,and/or morphological anisotropy of larger bundles made of nanowires.The importance of this work evidences that the vapor-solid reaction can facilely fabricate organic nanowire materials.Secondly,we report the great effects of solvent type(protic/aprotic)/polarity on morphologies of boron-difluoride complex microstructural materials.We found that the hydrogen bonding interaction between protic solvent(water or ethanol)and boron-difluoride complex could subtly tune the anisotropic growth to give sheetlike morphologies.However,the aprotic dipole solvent(acetonitrile or acetone)mainly induces unusual hexangular prismlike or cubelike morphologies.It is interestingly found that the solvent polarity also has important influence on morphologies.Compared to prismlike or cubelike morphologies,microsheet morphologies reveal enhanced luminescent emission and near-infrared absorption,which should be attributed to morphological anisotropy,demonstrating morphology-sensitive photophysical properties.This work exemplifies that solvent type(protic/aprotic)/polarity can significantly tune the morphologies and properties of organic micro/nanomaterials.Finally,under high temperature and high pressure condition,we unprecedentedly synthesized two novel 1,2-dihydroisoquinoline radicals through cascade ion-type,radical-type and pericyclic reaction mechanisms.This work indicates that from a radical precursor and triethylamine that also was used as a solvent,the 1,2-dihydroisoquinoline framework can be constructed through cascade reactions under high temperature and high pressure condition.Interestingly,1,2-dihydroisoquinolines not only reveal the phosphorescence,but also the interesting magnetic properties due to their radical nature.The present work provides a promising approach for synthesizing 1,2-dihydroisoquinoline radical materials and a new access to develop cascade reaction for constructing complicated organic compounds by facile and high-efficiency high temperature and high pressure synthetic approach.