To address the stereoselective synthesis challenge inπ-stacked grids with four chiral centers,we utilized coplanar and highly rigid 11,12-dihydroindeno[2,1-a]fluorene-11,12-diol and 2,2'-bithiophene as synthons,e...To address the stereoselective synthesis challenge inπ-stacked grids with four chiral centers,we utilized coplanar and highly rigid 11,12-dihydroindeno[2,1-a]fluorene-11,12-diol and 2,2'-bithiophene as synthons,employing Friedel-Crafts gridization(FCG).Leveraging the supramolecular interactions of S···S andπ···πwithin the thiophene moiety,along with the steric effect of the 11,12-dihydroindeno[2,1-a]fluorene scaffold,we successfully achieved the exclusive generation of a single isomer of Ladder-typeπ-stacked grids(LGs-IF)containing six theoretical isomers.By subsequently substituting 2,2'-bithiophene with thiophene/bithiophene derivatives as synthons,we maintained an exceptionally high level of stereoselectivity.This study introduces a novel approach for the stereo-controlled preparation of grids involving multi-chiral centers.展开更多
The use of plant-protecting unmanned aerial vehicles(UAVs)for pesticide spraying is an essential operation in modern agriculture.The balance between reducing pesticide consumption and energy consumption is a significa...The use of plant-protecting unmanned aerial vehicles(UAVs)for pesticide spraying is an essential operation in modern agriculture.The balance between reducing pesticide consumption and energy consumption is a significant focus of current research in the path-planning of plant-protecting UAVs.In this study,we proposed a binarization multi-objective model for the irregular field area,specifically an improved non-dominated sorting genetic algorithm–II based on the knee point and plane measurement(KPPM-NSGA-ii).The binarization multi-objective model is applied to convex polygons,concave polygons and fields with complex terrain.The experiments demonstrated that the proposed KPPM-NSGA-ii can obtain better results than the unplanned path method whether the optimization of pesticide consumption or energy consumption is preferred.Hence,the proposed algorithm can save energy and pesticide usage and improve the efficiency in practical applications.展开更多
A novel type of A-type nanogrids(AGs)with axial and central chirality was synthesized via Friedel-Crafts gridization of thiophenes and difluorenyl biaromatic derivatives,yielding 9%-30%.Additionally,the effect of ster...A novel type of A-type nanogrids(AGs)with axial and central chirality was synthesized via Friedel-Crafts gridization of thiophenes and difluorenyl biaromatic derivatives,yielding 9%-30%.Additionally,the effect of stereoisomers of 1,1'-binaphthyl difluorenols(BINDFOH)was investigated to demonstrate that R/S-BINDFOH is more advantageous for the synthesis of AGs than Mix-BINDFOH.Furthermore,tests on OFET memory devices showed that AGs have a larger storage window,indicating potential for data storage applications.展开更多
基金the National Natural Science Foundation of China(22071112 and 22275098)the Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications(GDX2022010005 and GZR2022010011)the Postgraduate Technology&Practice Innovation Program of Jiangsu Province(KYCX22_0902).
文摘To address the stereoselective synthesis challenge inπ-stacked grids with four chiral centers,we utilized coplanar and highly rigid 11,12-dihydroindeno[2,1-a]fluorene-11,12-diol and 2,2'-bithiophene as synthons,employing Friedel-Crafts gridization(FCG).Leveraging the supramolecular interactions of S···S andπ···πwithin the thiophene moiety,along with the steric effect of the 11,12-dihydroindeno[2,1-a]fluorene scaffold,we successfully achieved the exclusive generation of a single isomer of Ladder-typeπ-stacked grids(LGs-IF)containing six theoretical isomers.By subsequently substituting 2,2'-bithiophene with thiophene/bithiophene derivatives as synthons,we maintained an exceptionally high level of stereoselectivity.This study introduces a novel approach for the stereo-controlled preparation of grids involving multi-chiral centers.
基金funded by the National Natural Science Foundation of China(72274099 and 71974100)the Humanities and Social Sciences Fund of the Ministry of Education,China(22YJC630144)+1 种基金the Major Project of Philosophy and Social Science Research in Colleges and Universities in Jiangsu Province,China(2019SJZDA039)the Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(KYCX22_1244).
文摘The use of plant-protecting unmanned aerial vehicles(UAVs)for pesticide spraying is an essential operation in modern agriculture.The balance between reducing pesticide consumption and energy consumption is a significant focus of current research in the path-planning of plant-protecting UAVs.In this study,we proposed a binarization multi-objective model for the irregular field area,specifically an improved non-dominated sorting genetic algorithm–II based on the knee point and plane measurement(KPPM-NSGA-ii).The binarization multi-objective model is applied to convex polygons,concave polygons and fields with complex terrain.The experiments demonstrated that the proposed KPPM-NSGA-ii can obtain better results than the unplanned path method whether the optimization of pesticide consumption or energy consumption is preferred.Hence,the proposed algorithm can save energy and pesticide usage and improve the efficiency in practical applications.
基金supported by the National Natural Science Foundation of China(22071112 and 22275098)the Project of State Key Laboratory of Organic Electronics and Information Displays,Nanjing University of Posts and Telecommunications(GDX2022010005 and GZR2022010011).
文摘A novel type of A-type nanogrids(AGs)with axial and central chirality was synthesized via Friedel-Crafts gridization of thiophenes and difluorenyl biaromatic derivatives,yielding 9%-30%.Additionally,the effect of stereoisomers of 1,1'-binaphthyl difluorenols(BINDFOH)was investigated to demonstrate that R/S-BINDFOH is more advantageous for the synthesis of AGs than Mix-BINDFOH.Furthermore,tests on OFET memory devices showed that AGs have a larger storage window,indicating potential for data storage applications.
