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    Home > Research group of Professor Lang Jianping of Suzhou University: preparation of alkenyl metal organic frame optical actuator and its light mechanical energy conversion characteristics

    Research group of Professor Lang Jianping of Suzhou University: preparation of alkenyl metal organic frame optical actuator and its light mechanical energy conversion characteristics

    • Last Update: 2019-05-21
    • Source: Internet
    • Author: User
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    In the field of soft robot, it is very important to convert the light energy into the optical actuator material of macro mechanical motion Currently, based on photochemical isomerization, [2+2] or [4+4] cycloaddition reaction, dynamic photochemistry, photo thermal / photo electric effect, light pressure effect, and combined with the strategy of device asymmetric structure design, many optical responsive driving systems, such as polymer hydrogel, liquid crystal elastomer, shape memory polymer, have been developed Due to the multi-component and complex three-dimensional network structure of polymer materials, the orientation and accurate homogeneous synthesis of photosensitive molecules are limited, which further restricts the conversion efficiency of light mechanical energy Therefore, it is still very difficult to design and synthesize a fast and efficient optical mechanical energy conversion anisotropic photoactuation system from bottom to top Recently, Professor Lang Jianping's research group of Suzhou University has realized rapid light mechanical energy conversion in organometallic frame single crystal materials for the first time on the basis of previous relevant work, and has prepared a flexible optical brake based on polyvinyl alcohol through the guidance of hydrogen bond template, which enlarges and enhances the photogenerated stress of organometallic frame materials Relevant research results were published in angew Chem Int ed (DOI: 10.1002 / anie 201903757) under the title of "fabric of new photoactors: macroscopic photographic responses of metal organic frameworks to radiation by UV light" Professor Lang Jianping's research group brief introduction: the research group has been engaged in the design, synthesis and application of complex catalysts for a long time; the design and synthesis of complexes (clusters) photoelectric materials; the design and application of MOFs with nano space; the simulation synthesis and reactivity of metal centers in metal proteins and enzymes Introduction to Professor Lang Jianping, Professor of materials and Chemical Engineering Department of Suzhou University He graduated from Suzhou University in 1984, received his Ph.D from the Institute of coordination chemistry, Nanjing University in 1993, and engaged in postdoctoral research in JSPS, Department of chemistry, Nagoya University, Japan, and Department of chemistry and chemical biology, Harvard University, United States, from 1995 to 2001 2001.3 served as a researcher and doctoral supervisor in Suzhou University He has successively served as the vice president and President of the College of chemical engineering, the executive director, director and Secretary of the Party committee of the Department of materials and chemical engineering, the executive vice president and President of the graduate school, the vice chairman of the academic degree evaluation committee and Secretary General of the Secretariat (January 2018 to now) He is now the leader of inorganic chemistry discipline of Suzhou University, academician of European Academy of Sciences (2018), member of Royal Society of Chemistry (FRSC, 2014 to now), member of Inorganic Chemistry Discipline Committee of Chinese Chemical Society (2009.12 to now), vice chairman of crystal chemistry Professional Committee of Chinese Chemical Society (2018.10 to now), member of molecular sieve Professional Committee of Chinese chemical society( From September 2018 to now), member of the 10th-12th board of directors of Jiangsu Chemical Society (from April 2009 to now) Since 2001, he has presided over 10 NSFC projects and more than 20 provincial and ministerial fund projects He has published 410 papers in core Chemical Journals at home and abroad, such as chem SOC Rev., J am Chem SOC., angelw Chem Int ed., coord Chem Rev., etc., and cited 6500 SCI retrieval papers 22 invention patents have been authorized by China, and won the outstanding achievement award of scientific research (NATURAL SCIENCE) (2011) of the Ministry of education, the science and technology progress award of Jiangsu Province (2010), the second prize of science and technology progress award of China Petroleum and Chemical Industry Association (2009) Winner of National Science Fund for Distinguished Young Scholars (2005), national candidate for one million talents project in the new century (2007), national excellent teacher of the Ministry of Education (2004), special allowance of the State Council (2005), young and middle-aged experts with outstanding contributions in Jiangsu Province (2006), training object of scientific and technological innovation team of "blue and green project" in Jiangsu Province (2008) In 2011), the distinguished professor of the Yangtze River scholars award program of the Ministry of Education (2011), the National May 1st Labor Medal (2011), the second level young and middle-aged science and technology leaders of the fourth "333 high level talent training project" of Jiangsu Province (2011), and the third "333 project" outstanding contribution award of Jiangsu Province (2011) Currently, he is the editorial board member of Dalton Transactions (2010 to now), Springer nature press scientific reports (2015 to now), etc Cutting edge scientific research achievements: in recent years, Professor Lang Jianping's research group of Suzhou University has carried out a series of research on the preparation and optical mechanical energy conversion characteristics of alkenyl metal organic frame optical actuators in the field of photochemical [2 + 2] cycloaddition reaction and multiple light switch within the crystal metal organic frame (angel Chem Int ed 2018, 57, 12696; chem Commun 2019, 55 , 3532; Chem Commun 2018 , 54 , 5831; Chem Commun 2017 , 53 , 5515; Chem Commun 2016 , 52 , 7990 )。 However, the photosensitive inorganic organic hybrid crystal materials have high Young's modulus, which makes the crystal lattice shrink or expand during the light reaction, resulting in the instant release of strain, leading to the optical effect behavior such as crystal jumping and bursting Recently, Professor Lang Jianping and Professor Zhou Hongcai of Texas A & M University in the United States have found that photo induced nonlinear contraction (PINC) exists in two-dimensional photosensitive olefin metal organic framework materials They made a detailed structural analysis of the single crystal of this kind of material, and found that the phenomenon is due to the transformation of the microstructure of the crystal under different wavelengths of light (420-365nm), the rotation of the free group (benzyl group) and the rigid ligand, and the bending of the metal ligand coordination bond, resulting in a large nonlinear shrinkage in a certain crystal axis direction The research results were recently published in Chem EUR J (DOI: 10.1002 / chem 201900347) Shi Yixiang, a doctoral student, is the first author of the paper, and Professor Lang Jianping and Professor Zhou Hongcai are the corresponding authors On the basis of the above work, they introduced a strong electron absorption group F into the olefin ligands and successfully obtained a two-dimensional metal organic framework material [Zn (BDC) (3-f-spy)] n (1, H 2 BDC = p-phenyldiacid, 3-f-spy = 3-fluorophenylvinyl 4-pyridine) with rapid photo mechanical deformation The results of single crystal X-ray diffraction show that a pair of olefin ligands in 1 undergoes [2 + 2] cycloaddition reaction after irradiation, and the transition from single crystal to single crystal is three-dimensional metal organic framework material [Zn (BDC) (RCTT PPCB) 0.5] n (1a) At the same time, the volume V of the framework lattice shrinks greatly (6.1%) Among them, when the other crystal axes remain relatively unchanged, the a-axis shrinks nearly 6.67%, which means that the stress produced by cycloaddition has certain directionality (Fig 1) Figure 1 Light induced lattice contraction a The single crystal structure of B) 1 and 1A; the single crystal structure of olefin ligands and cyclobutane derivatives in C, d) 1 and 1a (source: angelw Chem Int ed.) Therefore, the author has studied the influence of the ratio of transverse to longitudinal of single crystal on its optical mechanical deformation The results show that when the ratio of transverse to longitudinal changes, the single crystal will spiral under the light radiation On the contrary, when the ratio of transverse to longitudinal of single crystal becomes larger, the single crystal often breaks and peels off under the light radiation (Fig 2) The structural analysis of the intermediate 1b single crystal shows that the stress caused by the photoinduced [2 + 2] cycloaddition reaction is located in the diagonal position of the stacking direction of the single crystal, thus forcing the single crystal with a small ratio of transverse to longitudinal to produce spiral or phototaxis bending behavior Fig 2 The photo mechanical deformation optical micrograph of crystal 1 induced by ultraviolet light (the direction of incidence of ultraviolet light is the left side of the image) (source: angelw Chem Int ed.) in addition, the large-scale photo mechanical behavior can be achieved by amplifying this photogenerated stress In this paper, a flexible optical actuator system based on polyvinyl alcohol (PVA) was prepared by using the strategy of noncovalent guided recombination Through AFM, SEM and PXRD analysis of the composite film, the surface roughness of the optical actuator system is very small (about 5.1nm), and the photoresponsive complex 1 has a high molecular orientation and relatively uniform distribution (Fig 3) Figure 3 Schematic diagram of preparation process of optical actuator 1-pva and SEM, PXRD characterization diagram (source: angel Chem Int ed.) the author further studied the light mechanical energy conversion behavior of the film The results show that the prepared 1-pva optical actuator system has high optical mechanical energy conversion efficiency Under the irradiation of incident light, the system bends rapidly, about 60 ° in 20 seconds, and the optical mechanical deformation process conforms to the first-order dynamic equation (Fig 4) Fig 4 Photo induced bending and photodynamic diagram of optical actuator 1-pva (source: angelw Chem Int ed.) In summary, the author developed the first optical actuator system based on olefin metal organic framework materials by regulating the electronic effect of olefin ligands This research not only fills in the blank of this research field, but also provides a new idea for the design and synthesis of fast and efficient optical mechanical energy conversion micro devices This research result was recently published in angew Chem Int ed (DOI: 10.1002 / anie 201903757) Shi Yixiang, a doctoral student, is the first author of the paper, and Professor Lang Jianping, a corresponding author This work was supported by the key project of NSFC (21531006), the State Key Laboratory of organic metal chemistry of Shanghai, Chinese Academy of Sciences (2018kf-05), the key discipline development project of Jiangsu University and the practice innovation project of Jiangsu graduate students 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.
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