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FACILE SYNTHESIS OF ACID-LABILE BIOCOMPATIBLE polymerS WITH PENDENT ORTHO ESTERS

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FACILE SYNTHESIS OF ACID-LABILE BIOCOMPATIBLE POLYMERS WITH ...

第五届国际高分子化学学术讨论会

作者： Jing Cheng Fu-Sheng Du Ran Ji Zheng-Ying qiao Zi-Chen Li beijing National Laboratory of molecular sciences Key Laboratory of polymer chemistry and Physics of Ministry of Education college of chemistry and molecular engineering peking university beijing 100871 People’s Republic of china.

＜正＞pH-Sensitive polymers and the relevant materials have been extensively studied regarding their applications in the fields of smart drug/gene delivery and diagnosis because of the numerous pH gradients in human *** ester is one of the most acid-labile functionalities *** recent years,we and others reported a family

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Ultraclean transfer of graphene by mechanically exfoliating polymer with modified crosslink density

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Nano Research 2024年第8期17卷 6795-6802页

作者： qi Lu Jiawei Yang Chaofan zhou Zhaoning Hu Saiyu Bu Bingbing Guo Yixuan Zhao Junhao Liao Mingpeng Shang Ge Chen Kaicheng Jia Jianbo Yin qiang Zeng Li Lin Zhongfan Liu college of science China University of Petroleum(Beijing)Beijing 102249China School of Materials science and engineering Peking UniversityBeijing 100871China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China beijing Graphene Institute Beijing 100095China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China department of Electronics Peking UniversityBeijing 100871China Second Clinical Division National Engineering Laboratory for Digital and Material Technology of StomatologyPeking University School and Hospital of StomatologyBeijing 100081China

The transfer of graphene from metallic substrates onto application-specific substrates is usually inevitable for the applications of high-quality graphene films derived from chemical vapour deposition(CVD)*** used to support the graphene films during the transfer,the coating of the polymer would produce the surface contaminations and hinder the industrially compatible *** this work,through the thermal imidization of polyamide acid(PAA)to polyimide(PI)and tuning of the concentration of dangling chains,we achieved the ultraclean and crack-free transfer of graphene wafers with high electronic *** resulting contamination-free and hydrophilic surface also enabled the observed improved cell viability in a biomedical *** avoiding aqueous etching or the usage of strong bases,our proposed transfer method is industrially compatible for batch transfer of graphene films towards the real applications.

关键词： chemical vapour deposition(CVD)graphene films graphene transfer ultraclean transfer transfer medium crosslink density cell viability assay

Single-molecule Spectroscopy of Protein Folding with Tuning the Loop Closure

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Single-molecule Spectroscopy of Protein Folding with Tuning ...

第一届全国生物物理化学会议暨生物物理化学发展战略研讨会

作者： Ze Yong Zhi,Peng Cheng Liu,and Xin Sheng Zhao~* beijing National Laboratory for molecular sciences,State Key Laboratory for Structural chemistry of Unstable and Stable Species,and department of Chemical Biology,college of chemistry and molecular engineering,peking university,beijing 100871,china

＜正＞The kinetics of loop closure sets the"speed limit"for protein *** molecule fluorescence resonance energy transfer（smFRET） is a powerful method to study the specific chain *** have used the combination of smFRE... 详细信息

关键词： FRET protein folding polymer

THE chemistry OF NANOSCALE ORGANOIMIDO DERIVATIVES OF POLYOXOMETALATES

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THE CHEMISTRY OF NANOSCALE ORGANOIMIDO DERIVATIVES OF POLYOX...

Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： PINGFAN WU qiANG Li YONGGE WEI YUAN WANG PING WANG HONGYOU GUOState Key Laboratory for Structural chemistry of Unstable and Stable Species college of chemistry and molecular engineering peking university beijing 100871 chinadepartment of Bioengineering Hubei university of Technology Wuhan 430068 china department of chemistry beijing university of Chemical and Technology beijing 100029 china

＜正＞ Organoimido derivatives of polyoxometalates play very important roles in the supramolecular chemistry and chemistry of materials based on polyoxometalates because they are valuable building blocks for constructing novel nanostructured organic-inorganic hybrid materials with unique catalytic, photo and electronic properties. However, their synthetic chemistry has not been well-developed since the first work reported by Maatta et al. Three years ago, one of us, together with his coworkers at UMKC, developed an efficient and convenient reaction protocol to give the arylimido derivatives of hexamolybdate, [Mo6O19]2-, and pentatungstenmolybdate, [MoW5O19]2-, using a carbodiimide, i.e., DCC （N,N’-dicyclohexylcarbo- diimide） as the dehydrating agent, and also found that the derivatives with iodo and ethynyl groups could undergo carbon-carbon coupling reactions in the presence of Pd catalyst. In this paper, we will give a brief review on this work and introduce our recent progresses in the synthetic and crystal structural chemistry of nanoscale organoimido derivatives of polyoxometalates.

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Chiral discrimination of alanine enantiomers in N+H…O modes by polarized Raman vibration spectroscopy with b(cc)b geometry

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Chiral discrimination of alanine enantiomers in N+H…O modes...

第一届全国生物物理化学会议暨生物物理化学发展战略研讨会

作者： Yan Gong~(*1),Yongkai Lu~2,and Wenqing Wang~3 1 beijing Key Laboratory of Clothing Materials R.& D and Assessment,School of Materials science & engineering,beijing Institute of Fashion Technology,beijing 100029,china 2 Medicine School,Tsinghua university,beijing 100084,china 3 department of Applied chemistry,beijing National Laboratory for molecular sciences,college of chemistry,peking university,beijing 100871,china

Chirality breaking of D- and L-alanine crystals in the c-direction of(NH…O) modes was observed by polarized Raman spectroscopy with b(cc)b geometry at *** to the Raman effects with vibrational states in the process of scattering alanine crystal,the ups and downs of(NH…O) hydrogen bonding showed strong directionality in alanine *** study reveals an intrinsic chirality in

关键词： chiral discrimination alanine enantiomers N+H...O mode raman spectroscopy

Nanomaterial Assisted Exosome Analysis Using Mass Spectrometry

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Chemical Research in Chinese Universities 2024年第2期40卷 237-254页

作者： ZHANG Yi zhou Bokai LI qiuning JIN Mingshi BAI Yu beijing National Laboratory for molecular sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871P.R.China department of chemistry Yanbian UniversityYanji133002P.R.China

Exosomes,extracellular vesicles(EVs)that play crucial roles in biological processes,have emerged as attractive targets for noninvasive disease diagnosis and *** spectrometry(MS)offers high sensitivity,high throughput,and excellent qualification and quantification capacity,which is the ideal approach for exosome ***’unique physiochemical properties,controllable morphology,and large surface area make them promising in biological sample pretreatment and *** contributed diverse functions to the exosome MS analysis,encompassing substrates for exosome isolation and cargos enrichment,matrices for laser desorption/ionization(LDI),read-out signals and supporters for signal amplification strategies,*** this review,recent progress in the applications of nanomaterial in the exosome MS analysis was summarized and a comprehensive discussion on the challenges and perspectives was proposed for the development of an advancing analysis approach of exosomes for the accurate diagnosis and monitoring of diseases.

关键词： Exosome Nanomaterial Enrichment Matrix Mass spectrometry

Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

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science china chemistry 2024年第10期67卷 3339-3346页

作者： Xue-Ru Wu Shu-qi Wu Zhi-Kun Liu Ming-Xing Chen Jun Tao Osamu Sato Hui-Zhong Kou engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China Institute for Materials chemistry and engineering&IRCCS Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Key Laboratory of Cluster science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488China Analytical Instrumentation Center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching ***,we report two two-dimensional(2D)Hofmann-type spin crossover(SCO)metal-organic frameworks(MOFs)[Fe^(Ⅱ)(PNI)_(2){Ag^(Ⅰ)(CN)_(2)}_(2)]·CHCl_(3)(3Ag·CHCl_(3))and[FeⅡ(PNI)_(2){AuⅠ(CN)_(2)}_(2)]·CHCl_(3)(3Au·CHCl_(3))based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide(PNI).Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules,namely three-step transitions for the solvated complexes and complete onestep hysteretic SCO for the desolvated ones,verified by temperature-dependent magnetic susceptibility measurements,Mossbauer spectra,structural analyses,and differential scanning calorimetry ***,temperature-dependent fluorescence spectra exhibit double peaks(monomer and excimer emission)with both emission peaks change consistent with the change in SCO properties during the solvent molecule *** this study,we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching,providing a rational strategy for the development of stimuli-responsive multifunctional materials.

关键词： spin crossover fluorescence multifunctional materials metal-organic frameworks Hofmann-type

Regulation of the quantum barrier and carrier transport toward high-efficiency quasi-2D Dion-Jacobson tin perovskite solar cells

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Journal of Energy chemistry 2024年第8期95卷 200-207,I0005页

作者： Huanhuan Yao Chang Shi Tai Wu Shurong Wang Mingyu Yin Liming Ding Yong Hua feng Hao School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina college of chemistry and molecular engineering Peking UniversityBeijing 100871China Yunnan Key Laboratory for Micro/Nano Materials&Technology School of Materials and EnergyYunnan UniversityKunming 650091YunnanChina Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Quasi-2D Dion-Jacobson(DJ)tin halide perovskite has attracted much attention due to its elimination of Van der Waals gap and enhanced environmental ***,the bulky organic spacers usually form a natural quantum well structure,which brings a large quantum barrier and poor film quality,further limiting the carrier transport and device ***,we designed three organic spacers with different chain lengths(ethylenediamine(EDA),1,3-propanediamine(PDA),and 1,4-butanediamine(BDA))to investigate the quantum barrier *** and experimental characterizations indicate that EDA with short chain can reduce the lattice distortion and dielectric confinement effect,which is beneficial to the effective dissociation of excitons and the inhibition of trap-free non-radiative *** addition,EDA cation shows strong interaction with the inorganic octahedron,realizing large aggregates in precursor solution and high-quality films with improved structural ***,femtosecond transient absorption proves that EDA cations can also weaken the formation of small n-phases with large quantum barrier to achieve effective carrier transport between different ***,the quasi-2D DJ(EDA)FA_(9)Sn_(10)I_(31)solar cells achieves a 7.07%power conversion efficiency with good environment ***,this work sheds light on the regulation of the quantum barrier and carrier transport through the chain length of organic spacer for qua si-2D DJ lead-free perovskites.

关键词： Chain lengths Organic spacers Quantum well Carrier transport Lattice distortion

SYNTHESIS AND PROPERTIES OF NEW SIDE-CHAIN LIQUID CRYSTALLINE polymer WITH LATERALLY ATTACHED MESOGENS BY ESTER GROUP

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Chinese Journal of polymer science 1999年第5期17卷 499-502页

作者： qi-ding Mi qi-feng zhou department of polymer science&engineering College of ChemistryPeking UniversityBeijing 100871China

New liquid crystalline monomer,2,5-bis[(4'-methoxyphenoxy)carbonyl]phenyl acrylate was successfully *** with laterally attached mesogens via ei;ter linkage was also *** polymer forms an enantiotropic liquid crystal phase while its monomer exhibits a metastable nematic phase with respect to the crystalline ***,its liquid crystallinity is very low as compared to that of poly{2,5-bis[(4'-methoxyphenoxy)carbonyl]-styrene}.

关键词： poly{2,5-bis[(4'-methoxyphenoxy)carbonyl]phenyl acrylate} hydroxyterephthalic acid mesogen-jacketed liquid crystalline polymers