Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201906020
Junhong Qian, W. Xia, Wenqing Zhang, Haiyan Liu, P. Hu, Yan Wang
Abstract: Mass spectrometric analysis is a key and difficult issue in teaching of spectroscopic analysis course. Moreover, fragmentation patterns are the key points for mass spectrometric analysis. Understanding the dissociation rules of organic compounds will help the students to analyze the chemical structures. From the viewpoint of teaching practice, we review in this paper the fragmentation patterns of some common isomers such as acids-esters, alcoholsethers, and straight-chain and branched-chain alkyl groups. In addition, some classic examples were presented to help the students to grasp the fragmentation patterns as well as to improve their ability of mass spectrometric analysis.
{"title":"Discussion on Mass Spectrometric Analysis of Several Isomers","authors":"Junhong Qian, W. Xia, Wenqing Zhang, Haiyan Liu, P. Hu, Yan Wang","doi":"10.3866/pku.dxhx201906020","DOIUrl":"https://doi.org/10.3866/pku.dxhx201906020","url":null,"abstract":"Abstract: Mass spectrometric analysis is a key and difficult issue in teaching of spectroscopic analysis course. Moreover, fragmentation patterns are the key points for mass spectrometric analysis. Understanding the dissociation rules of organic compounds will help the students to analyze the chemical structures. From the viewpoint of teaching practice, we review in this paper the fragmentation patterns of some common isomers such as acids-esters, alcoholsethers, and straight-chain and branched-chain alkyl groups. In addition, some classic examples were presented to help the students to grasp the fragmentation patterns as well as to improve their ability of mass spectrometric analysis.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70218447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201906022
Weiqing Zhang, Bin Huang, Xiaolan Yu, Jianhui Zhang
This paper introduces the geometric assumptions and neglects of the pore size distribution calculated by BJH method, the arithmetic approximation for simplified calculation, the derivation process of each parameter, the calculation steps and key points of the pore size distribution. This paper also introduces the application scope of BJH method at the current instrument level, and how to further integrate the data. In order to get the required analysis and test report, references are provided for the subsequent adjustment of test parameters and improvement of test methods. Some problems often encountered in reading experimental reports are also discussed.
{"title":"Interpretation of BJH Method for Calculating Aperture Distribution Process","authors":"Weiqing Zhang, Bin Huang, Xiaolan Yu, Jianhui Zhang","doi":"10.3866/pku.dxhx201906022","DOIUrl":"https://doi.org/10.3866/pku.dxhx201906022","url":null,"abstract":"This paper introduces the geometric assumptions and neglects of the pore size distribution calculated by BJH method, the arithmetic approximation for simplified calculation, the derivation process of each parameter, the calculation steps and key points of the pore size distribution. This paper also introduces the application scope of BJH method at the current instrument level, and how to further integrate the data. In order to get the required analysis and test report, references are provided for the subsequent adjustment of test parameters and improvement of test methods. Some problems often encountered in reading experimental reports are also discussed.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70218520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201912010
Xin Hu, Ze Chen, Tao Yan, K. Hu, Faqiong Zhao, Chi Huang, Yuwen Liu
The classical kinetic experiment in physical chemistry, Belousov-Zhabotinsky (B-Z) oscillating reaction, was redesigned. The mathematical treatment of nonlinear complex reaction kinetics based on the reaction mechanism and the application of B-Z reaction in the detection of silver ions are introduced in the new experimental scheme. The new scheme can deepen students’ understanding of nonlinear non-equilibrium kinetics and dissipative structure. Moreover, the numerical method dealing with the complex kinetics can be used in future scientific research and practice.
{"title":"Redesign of Belousov-Zhabotinsky (B-Z) Reaction, an Experiment in Physical Chemistry","authors":"Xin Hu, Ze Chen, Tao Yan, K. Hu, Faqiong Zhao, Chi Huang, Yuwen Liu","doi":"10.3866/pku.dxhx201912010","DOIUrl":"https://doi.org/10.3866/pku.dxhx201912010","url":null,"abstract":"The classical kinetic experiment in physical chemistry, Belousov-Zhabotinsky (B-Z) oscillating reaction, was redesigned. The mathematical treatment of nonlinear complex reaction kinetics based on the reaction mechanism and the application of B-Z reaction in the detection of silver ions are introduced in the new experimental scheme. The new scheme can deepen students’ understanding of nonlinear non-equilibrium kinetics and dissipative structure. Moreover, the numerical method dealing with the complex kinetics can be used in future scientific research and practice.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70220592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202001025
Jing Yan, Fenglin Zhong, Jiaping Niu, Hao Guan, Jie Kong, Zhang Junping, Yingtzu Yan
Scientific research training is an essential part of undergraduate learning, which plays an important role in improving students’ knowledge utilization and scientific literacy. Taking the participation process of “Energy conservation and emission reduction competition” as an example, this paper briefly introduces the undergraduate scientific research training of students majoring in polymer materials and engineering from their own perspective, and the way to combine the discipline and school characteristics to reflect the thinking of engineering students in scientific research and practical application.
{"title":"Scientific Research Training and Practice of Undergraduates in Engineering Schools: Taking Energy Conservation and Emission Reduction Competition as an Example","authors":"Jing Yan, Fenglin Zhong, Jiaping Niu, Hao Guan, Jie Kong, Zhang Junping, Yingtzu Yan","doi":"10.3866/pku.dxhx202001025","DOIUrl":"https://doi.org/10.3866/pku.dxhx202001025","url":null,"abstract":"Scientific research training is an essential part of undergraduate learning, which plays an important role in improving students’ knowledge utilization and scientific literacy. Taking the participation process of “Energy conservation and emission reduction competition” as an example, this paper briefly introduces the undergraduate scientific research training of students majoring in polymer materials and engineering from their own perspective, and the way to combine the discipline and school characteristics to reflect the thinking of engineering students in scientific research and practical application.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70220667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202003078
Ming Lei, Zuoyin Yang, Yaping Li, Minli Pu
Ming Lei *, Zuoyin Yang, Yaping Li, Min Pu Institute of Computational Chemistry, State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China. Abstract: Since the outbreak of novel coronavirus pneumonia (NCP) at the beginning of this year, Chinese government acted immediately and made some regulations to control the epidemic NCP and promote the recovery of society and industry including education. Chinese universities stayed on the online courses without suspension on teaching and learning. Herein, we report online teaching of structural chemistry course based on the teaching mode of online live broadcast platform, online course resources and management platforms (“1 + 2” mode). This may promote online teaching, and take advantage of online live broadcast and massive open online courses, which achieves good teaching and learning experiences on structural chemistry course.
{"title":"Online Teaching of Structural Chemistry Course Based on “1+2” Platform","authors":"Ming Lei, Zuoyin Yang, Yaping Li, Minli Pu","doi":"10.3866/pku.dxhx202003078","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003078","url":null,"abstract":"Ming Lei *, Zuoyin Yang, Yaping Li, Min Pu Institute of Computational Chemistry, State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China. Abstract: Since the outbreak of novel coronavirus pneumonia (NCP) at the beginning of this year, Chinese government acted immediately and made some regulations to control the epidemic NCP and promote the recovery of society and industry including education. Chinese universities stayed on the online courses without suspension on teaching and learning. Herein, we report online teaching of structural chemistry course based on the teaching mode of online live broadcast platform, online course resources and management platforms (“1 + 2” mode). This may promote online teaching, and take advantage of online live broadcast and massive open online courses, which achieves good teaching and learning experiences on structural chemistry course.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: Online teaching is an important measure to carry out the “no suspension of classes” during novel coronavirus pneumonia, how to make online teaching more effective is currently the major problem. In this paper, selecting Tencent Meeting and Ketangpai as the teaching platforms, complementary with the respective advantages of the other process evaluation platforms, a new form of online teaching of organic chemistry courses was built by three approaches including reorganizing teaching resources, innovating teaching activities and reforming teaching evaluation . It provides reference for the effective implementation of online teaching.
{"title":"Online Teaching Practice of Organic Chemistry Course based on Tencent Meeting and Ketangpai","authors":"Enxiang Liang, Luisa Li, Lichao Liu, Caixia Yang, Guoxiang Wang, Wenyuan Xu","doi":"10.3866/pku.dxhx202003080","DOIUrl":"https://doi.org/10.3866/pku.dxhx202003080","url":null,"abstract":": Online teaching is an important measure to carry out the “no suspension of classes” during novel coronavirus pneumonia, how to make online teaching more effective is currently the major problem. In this paper, selecting Tencent Meeting and Ketangpai as the teaching platforms, complementary with the respective advantages of the other process evaluation platforms, a new form of online teaching of organic chemistry courses was built by three approaches including reorganizing teaching resources, innovating teaching activities and reforming teaching evaluation . It provides reference for the effective implementation of online teaching.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70222316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx202004071
Yaxian Zhu, Liya Zhou, Shuyong Zhang, Lansun Zheng
During the suspending of education for prevention and control of COVID-19 epidemic, chemistry majors in colleges and universities actively responded to the requirements of the Ministry of Education that “class is suspended without stopping teaching, class suspension without learning suspension”, and earnestly organized online teaching. The National Instructional Committee of Chemistry Higher Education designed three questionnaires for chemistry majors, teachers and students to make survey on the online teaching. Through analysis of the survey, some important problems and suggestions are put forward. It is of significance to promote the future online education and teaching reform of relevant courses of chemistry majors.
{"title":"Survey Analysis and Suggestions on Online Teaching of Chemistry Majors during COVID-19 Epidemic","authors":"Yaxian Zhu, Liya Zhou, Shuyong Zhang, Lansun Zheng","doi":"10.3866/pku.dxhx202004071","DOIUrl":"https://doi.org/10.3866/pku.dxhx202004071","url":null,"abstract":"During the suspending of education for prevention and control of COVID-19 epidemic, chemistry majors in colleges and universities actively responded to the requirements of the Ministry of Education that “class is suspended without stopping teaching, class suspension without learning suspension”, and earnestly organized online teaching. The National Instructional Committee of Chemistry Higher Education designed three questionnaires for chemistry majors, teachers and students to make survey on the online teaching. Through analysis of the survey, some important problems and suggestions are put forward. It is of significance to promote the future online education and teaching reform of relevant courses of chemistry majors.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70223101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201905035
Feng-ling Liu
The shape of an atomic orbital not only depends on the azimuthal quantum number l, but also associates with the magnetic quantum number m. We discussed about how to derive the shape of an atomic orbital from the numbers and shapes of the angular nodal planes, and the symmetries of distribution of all angular nodal planes when l and |m| are known. According to the |m|, the compatibility of the symmetry of an atomic orbitals have also been also discussed.
{"title":"Derivation of the Shape of an Atomic Orbital from the Angular Nodal Planes and the Symmetries of Their Distribution","authors":"Feng-ling Liu","doi":"10.3866/pku.dxhx201905035","DOIUrl":"https://doi.org/10.3866/pku.dxhx201905035","url":null,"abstract":"The shape of an atomic orbital not only depends on the azimuthal quantum number l, but also associates with the magnetic quantum number m. We discussed about how to derive the shape of an atomic orbital from the numbers and shapes of the angular nodal planes, and the symmetries of distribution of all angular nodal planes when l and |m| are known. According to the |m|, the compatibility of the symmetry of an atomic orbitals have also been also discussed.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70216196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201907039
Lingling Wei, H. Jiao
: A research-based comprehensive experiment was introduced: co-precipitation synthesis, structure characterization and photoluminescent properties of K 2 GeF 6 :Mn phosphors. Chemical redox and co-precipitation method was employed to synthesize K 2 GeF 6 :Mn phosphors. By using XRD, SEM and PL spectra characterization techniques, the effects of Mn contents and reactive temperatures on the structure and properties of K 2 GeF 6 :Mn phosphors were studied. The red phosphors show great potential in LEDs applications. Through this experiment, students can master the basic laboratory skills; interpret the experimental principles with their basic theoretical knowledge, which will further enhance their scientific research ability and comprehensive application of knowledge.
{"title":"Study on Co-precipitation Synthesis, Structure Characterization and Photoluminescent Properties of K2GeF6: Mn Phosphors","authors":"Lingling Wei, H. Jiao","doi":"10.3866/pku.dxhx201907039","DOIUrl":"https://doi.org/10.3866/pku.dxhx201907039","url":null,"abstract":": A research-based comprehensive experiment was introduced: co-precipitation synthesis, structure characterization and photoluminescent properties of K 2 GeF 6 :Mn phosphors. Chemical redox and co-precipitation method was employed to synthesize K 2 GeF 6 :Mn phosphors. By using XRD, SEM and PL spectra characterization techniques, the effects of Mn contents and reactive temperatures on the structure and properties of K 2 GeF 6 :Mn phosphors were studied. The red phosphors show great potential in LEDs applications. Through this experiment, students can master the basic laboratory skills; interpret the experimental principles with their basic theoretical knowledge, which will further enhance their scientific research ability and comprehensive application of knowledge.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70219291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.3866/pku.dxhx201910060
Houjin Li, Yang Xu, Y. Zhong, Xiaoyan Zhang, Fangmeng Zhu, Liuping Chen
: Using α -amino acids, aldehydes, isocyanides and alcohols as the starting materials, four components react in one pot at room temperature to obtain naturally unique bioactive alkaloids, 1,1’-iminodicarboxylic acid derivatives. The reaction process is monitored by thin layer chromatography and liquid chromatography-mass spectrometry, and the products are purified by silica gel column chromatography. The structures are determined by mass spectrometry and nuclear magnetic resonance spectroscopy. The reaction is an innovative development of Ugi reaction, which has the characteristics of simple reaction operation, high yield, good stereoselectivity and high atomic economy. It has been widely used in the design and synthesis of new drugs, combinatorial chemistry and natural product synthesis.
{"title":"Synthesis of Unique Bioactive Alkaloids by Ugi Four-Component One-Pot Reaction","authors":"Houjin Li, Yang Xu, Y. Zhong, Xiaoyan Zhang, Fangmeng Zhu, Liuping Chen","doi":"10.3866/pku.dxhx201910060","DOIUrl":"https://doi.org/10.3866/pku.dxhx201910060","url":null,"abstract":": Using α -amino acids, aldehydes, isocyanides and alcohols as the starting materials, four components react in one pot at room temperature to obtain naturally unique bioactive alkaloids, 1,1’-iminodicarboxylic acid derivatives. The reaction process is monitored by thin layer chromatography and liquid chromatography-mass spectrometry, and the products are purified by silica gel column chromatography. The structures are determined by mass spectrometry and nuclear magnetic resonance spectroscopy. The reaction is an innovative development of Ugi reaction, which has the characteristics of simple reaction operation, high yield, good stereoselectivity and high atomic economy. It has been widely used in the design and synthesis of new drugs, combinatorial chemistry and natural product synthesis.","PeriodicalId":23447,"journal":{"name":"University Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70219840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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