echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Sun Daofeng, China University of Petroleum (East China) / Zhou Hongcai, Texas A & M University

    Sun Daofeng, China University of Petroleum (East China) / Zhou Hongcai, Texas A & M University

    • Last Update: 2019-04-18
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    Introduction metal organic frameworks (MOFs), as a kind of promising porous materials, have potential applications in many fields due to their large specific surface area, unsaturated metal sites, pore structure and the tunability of pore environment How to design and precisely control the formation of functional high connection MOF structure is still a challenging work Recently, Professor Sun Daofeng's research group of China University of Petroleum (East China) and Professor Zhou Hongcai of Texas A & M University have combined to synthesize three novel rare earth cluster MOF materials (j.am.chem.soc., 2019, DOI: 10.1021/jacs.9b00122) by controlling the substituent steric resistance effect Prof sun Daofeng graduated from Fujian Institute of material structure, Chinese Academy of Sciences in 2003 with a Ph.D from academician Hong Maochun and researcher Cao Rong Later, he went to Miami University in the United States to engage in postdoctoral research, with the cooperative tutor of Professor Zhou Hongcai 2007 In, he returned to China to engage in scientific research and taught in the school of chemistry and chemical engineering, Shandong University In the same year, he was elected professor and doctoral supervisor In 2010, he was selected into the new century excellent talents support plan of the Ministry of education, and won the outstanding youth fund of Shandong Province in the same year In 2011, it won the science and technology award of Shandong Province In 2012, it won the first prize of excellent scientific research achievements of Shandong University In 2013, he served as a professor and doctoral supervisor in China University of Petroleum (East China) School of science, and won the first prize of the 9th Qingdao Youth Science and technology award In 2014, he was selected as a short-term talent of Qingdao "wisdom Island plan", and won the Qingdao top talent and Qingdao Youth Science and technology award In 2015, he won the youth science and technology award of Shandong Province, and was selected as the special expert of Taishan Scholars of Shandong Province in the same year In 2016, he won the title of outstanding communist party member of Shandong University In 2018, it won the first prize of science and technology of colleges and universities in Shandong Province Professor Sun Daofeng's research focuses on the design and synthesis of ordered porous materials and their application in the fields of gas adsorption, separation and catalysis He has presided over more than 10 projects of NSFC and provincial and ministerial level, and has published more than 150 SCI papers in international well-known journals such as J am Chem SOC., angel Chem Int ed., adv SCI., chem SCI., etc so far, he has been selected into Elsevier's China high school list for four consecutive years (2014-2018) H factor 42, the article was cited more than 6400 times Introduction to Professor Sun Daofeng's research group the research group was founded in 2013 So far, it has 7 instructors, all of whom are under 45 years old and have overseas research experience, including 3 professors, 2 associate professors and 2 lecturers He has presided over 7 NSFC projects and published more than 70 SCI papers in the past three years The research direction of team members includes many branches of materials science, including porous materials, nano materials, membrane materials, composite materials and other fields The members are interdisciplinary and have complementary advantages It is a scientific research and innovation team integrating "module design → structure construction → topology derivation → material preparation → theoretical analysis → application performance optimization" The research group has independent organic synthesis laboratory, inorganic synthesis laboratory, material characterization and performance testing laboratory The experimental instrument independently has X-ray single crystal diffractometer, gas / liquid membrane separation device, proton conduction test system, ion / liquid / gas chromatography, gas adsorption and separation system, glove box and battery preparation and test system, gamry full set of electrochemical workstation and 10 More than one tube furnace equipment, thermogravimetric analyzer, fluorescence spectrophotometer, supercritical dryer, ball mill, spin coating instrument Relying on the school of materials science and engineering of China University of Petroleum (East China) and the State Key Laboratory of heavy oil, it has powder diffractometer, scanning / transmission / atomic force microscope, liquid phase / solid phase NMR, which can meet the requirements from material preparation, characterization to performance test Cutting edge scientific research achievements: the research group of sun Daofeng, Professor of China University of Petroleum (East China) and Zhou Hongcai, Professor of Texas A & M University, have made a series of works in the preparation and application of high connection metal organic framework (MOF) materials, focusing on zirconium / rare earth MOF The controllable synthesis and its application in adsorption and catalysis In this paper, a zirconium based MOF was constructed by using the linear dicarboxylic ligands containing double bonds assembled with zirconium ions Through the removal of linear ligands in MOF, the author realized the post modification synthesis of zirconium MOF, and constructed zirconium MOFs based on a series of transition metal ions (Fe2 +, CO2 +, Ni2 +, Cu2 +, Pd2 +) coordinated by pyridine carboxylic acid Among them, zirconium MOF containing nickel metal ions showed high activity in the dimerization of ethylene (j.am.chem.soc 2018, 140, 10814−10819 )。 Under the guidance of thermodynamics, a series of multi-component MOFs, namely pcn-900 (RE), were formed by tetracarboxylic porphyrin, linear ligand and Hexanuclear rare earth cluster (re6) In this series of MOFs, two different metal ions could be placed on the linear linker and tetracarboxylic porphyrin respectively, forming an ideal heterogeneous catalytic platform (angel Chem Int ed 2018 , 57 , 5095–5099 )。 This paper is also an inheritance and development of the above work Complex functional porous materials have obvious advantages in many fields, mainly because of their adjustable and modifiable structures Based on this point, this paper focuses on the discovery and application of novel topological structures of multi-core rare earth based MOF (j.am.chem.soc 2019, DOI: 10.1021/jacs.9b00122) Fig 1 The topological structure of rare earth based metal organic frameworks constructed by different symmetrical ligands (source: j.am Chem SOC.) in this paper, based on the L-H ligands, we functionalized them with different steric substituents and got six kinds of trijunction ligands with different steric resistances On this basis, three cases of rare earth based MOF materials with new topological structure were obtained The methyl functionalized ligand (l-ch3) with C 2V symmetry exhibits a large steric hindrance, which forces the two peripheral benzene rings to be perpendicular to the central benzene ring The combination of C 2V ligands and 9-linked re 6 clusters forms a new 3,9-linked SEP topology (Fig 1E) Different from the Zr MOF, which presents the Zr 6 clusters in various ligand configurations and corresponding different structures, when it is connected with the C 1 symmetric non functional ligand (L-H), the adaptable re 6 clusters can undergo metal insertion and rearrange into a new re 9 cluster, resulting in a new 3,3,18 connected yTW topology (Fig 1c) More interestingly, the author wisely combined the ligands with large and small substituent steric hindrance through the mixed ligand strategy Because of the continuous steric hindrance control, we can obtain the re 9-based MOF with 3,3,12-connected flg topology (Fig 1b) Fig 2.12 possible rearrangement process of connecting six core re 6 clusters to 18 connecting nine core re 9 clusters (source: j.am Chem SOC.) the authors also try to compare the clusters of rare earth based and zirconium based MOF Because of the strong stability of zirconium six core, it is not easy to change, but to maintain the original appearance to find suitable ligands, while rare earth clusters (re )Due to its strong adaptability, it can be rearranged with the changes of the outside world, so as to get more unprecedented topology The author tries to explain the formation mechanism of different topologies In the process of structure formation, re clusters can undergo three types of changes: 1 The decrease of extension points (n-connectivity number) in the parent cluster; 2 Keeping unchanged; 3 Increasing the extension points in the parent cluster by metallization and rearrangement By systematically changing the steric hindrance of the central benzene ring substituents on L-H ligands, the two edge benzene rings can be forced to rotate to form various new topological structures Fig 3 The relative energy of different ligands in pcn-9xx series with different topological structures (source: j.am Chem SOC.) finally, the author explored the influence of ligand hindrance on steric control by DFT calculation (Fig 3) By comparing the relative energies of the ligands in pcn-909 and pcn-918, it can be concluded that the ligands with larger substituents (- CH3, - Cl and - NH2) have larger torsional angle, while the ligands modified by - H, - F and - OCH3 have smaller torsional angle, which proves that the steric effect in the ligands is conducive to the formation of pcn-909 The energy difference of l-ch3 in pcn-912 and pcn-909 is ~ 5.9 kJ / mol, while the energy difference of L-H in pcn-912 and pcn-918 is ~ 7.1 kJ / mol From the point of view of connector, the formation of pcn-912 only needs a relatively low energy barrier Conclusion: by systematically adjusting the steric effect of substituents in ligands, the formation and connection of rare earth clusters are precisely regulated, and then complex and novel functional porous MOF materials are obtained This work was published on J am Chem SOC (DOI: 10.1021 / JACS 9b00122) under the title of "topology exploration in highlyconnected rare earth metal organic frameworks via continuous hindrance control" The first author is Wang Yutong, doctoral student of China University of Petroleum (East China), and Feng Liang, doctoral student of Texas A & M University as the co first author The corresponding authors are sun Daofeng, Professor of China University of Petroleum (East China), and Zhou Hongcai, Professor of Texas A & M University China University of Petroleum (East China) is the first communication unit (author: Yutong Wang, Liang Feng, Weidong fan, Kun Yu Wang, Xia Wang, xiaookang Wang, Kai Zhang, Xiaorong Zhang, Fangna Dai, Daofeng sun, and Hong caizhou) Nowadays, people and scientific research have been paid more and more attention in the economic life China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.