Early View Wiley/Wiley-VCH

Chemistry - A European Journal

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO2 Catalyst: Contribution of Oxygen Vacancies in CeO2

Published: 22 March 2019

Author(s): Guoqiang Liu, Zhiqing Cui, Miaomiao Han, Shengbo Zhang, Cuijiao Zhao, Chun Chen, Guozhong Wang, Haimin Zhang

Abstract Electrosynthesis of NH3 through the N2 reduction reaction (NRR) under ambient conditions is regarded as promising technology to replace the industrial energy‐ and capital‐intensive Haber–Bosch process. Herein, a room‐temperature spontaneous redox approach to fabricate a core–shell‐structured Au@CeO2 composite, with Au nanoparticle sizes below about 10 nm and a loading amount of 3.6 wt %, is reported for the NRR. The results demonstrate that as‐synthesized Au@CeO2 possesses a surface...

Chemistry - A European Journal

Copolymer‐Induced Intermolecular Charge Transfer: Enhancing the Activity of Metal‐Free Catalysts for Oxygen Reduction

Published: 22 March 2019

Author(s): Yihuan Yu, Zhengping Zhang, Liming Dai, Feng Wang

Abstract Breaking the electroneutrality of sp2 carbon lattice is a viable way for nanocarbon material to modulate the charge delocalization and to further alter the electrocatalytic activity. Positive charge spreadsheeting is preferable for catalyzing the oxygen reduction reaction (ORR) and other electrochemical reactions. Analogously to the case of intramolecular charge transfer by heteroatom doping, electrons in the conjugated carbon lattice can be redistributed by the intermolecular charge...

Chemistry - A European Journal

A Visibly Observable, Programmable Supramolecular Logic Platform and Its Application in Smart Thiols Sensing

Published: 22 March 2019

Author(s): Jianchi Chen, Shu Yang, Chunrong Yang, Jicheng Li, Dan Huang, Xiao Lin, Chen Guo, Qiuju Zhou, Qianfan Yang, Yalin Tang

Abstract Molecular computation is increasingly attractive as a tool for medical and biological research because of its programmability and controllability. Herein, a novel visibly observable supramolecular system that can execute multi‐level logic functions on a uniform platform was constructed. By employing some programming factors, we succeeded in not only constructing a whole set of contrary logic pairs, but also building up a logic network that can implement advanced functions. Further,...

ChemSusChem

Intramolecular Charge Transfer and Extended Conjugate Effects in Donor–π–Acceptor‐Type Mesoporous Carbon Nitride for Photocatalytic Hydrogen Evolution

Published: 22 March 2019

Author(s): Zongzhao Sun, Yabin Jiang, Lei Zeng, Limin Huang

Abstract Inspired by donor–acceptor (D–A) polymers in organic solar cell and the extended conjugation effect, a conceptual design of D–π–A‐type mesoporous carbon nitride with benzene or thiophene as a π‐spacer is proposed as an efficient photocatalyst for hydrogen evolution. The photocatalyst was successfully synthesized by a one‐pot thermopolymerization based on nucleophilic substitution and a Schiff‐base chemical reaction. On the molecular level, the insertion of an in‐plane benzene as a...

Pest Management Science

Density threshold‐based acaricide application for the two‐spotted spider mite Tetranychus urticae on cassava: from laboratory to the field

Published: 22 March 2019

Author(s): Qing Chen, Xiao Liang, Chunling Wu, Jintao Gao, Qian Chen, Zhe Zhang

ABSTRACT BACKGROUD The red spider mite Tetranychus urticae is known as a worldwide pest in cassava production which can caused serious economic losses. Because no threshold levels are established for T. urticae in cassava cropping, many growers in China are applying excessive chemical applications per cassava cropping period. This is not only expensive, but also results in lower yields because of severe leaf damage and development of resistance. This study aims to develop an immediate...

Chemistry - A European Journal

A Visibly Observable, Programmable Supramolecular Logic Platform and Its Application in Smart Thiols Sensing

Published: 22 March 2019

Author(s): Jianchi Chen, Shu Yang, Chunrong Yang, Jicheng Li, Dan Huang, Xiao Lin, Chen Guo, Qiuju Zhou, Qianfan Yang, Yalin Tang

Chemistry - A European Journal

Ambient Electrosynthesis of Ammonia on a Core–Shell‐Structured Au@CeO2 Catalyst: Contribution of Oxygen Vacancies in CeO2

Published: 22 March 2019

Author(s): Guoqiang Liu, Zhiqing Cui, Miaomiao Han, Shengbo Zhang, Cuijiao Zhao, Chun Chen, Guozhong Wang, Haimin Zhang

ChemMedChem

Synthesis and Biological Evaluation of RGD and isoDGR–Monomethyl Auristatin Conjugates Targeting Integrin αVβ3

Published: 22 March 2019

Author(s): André Raposo Moreira Dias, Lizeth Bodero, Ana Martins, Daniela Arosio, Silvia Gazzola, Laura Belvisi, Luca Pignataro, Christian Steinkühler, Alberto Dal Corso, Cesare Gennari, Umberto Piarulli

Abstract This work reports the synthesis of a series of small‐molecule–drug conjugates containing the αVβ3‐integrin ligand cyclo[DKP‐RGD] or cyclo[DKP‐isoDGR], a lysosomally cleavable Val‐Ala (VA) linker or an “uncleavable” version devoid of this sequence, and monomethyl auristatin E (MMAE) or F (MMAF) as the cytotoxic agent. The conjugates were obtained via a straightforward synthetic scheme taking advantage of a copper‐catalyzed azide–alkyne cycloaddition as the key step. The conjugates were...

European Journal of Organic Chemistry

Transition‐Metal‐Free Heterobiaryl Synthesis via Aryne Coupling

Published: 22 March 2019

Author(s): Tarak Saied, Catherine Demangeat, Armen Panossian, Frédéric R. Leroux, Yves Fort, Corinne Comoy

We disclose, for the first time, an efficient route for the construction of various heterobiaryl backbones in fair to excellent yields using the Aryne coupling methodology. This study outlined the remarkable effect of external chelating ligands and salt additives on the heterocyclic partner reactivity in the aryne coupling reaction.

European Journal of Organic Chemistry

A New Synthetic Pathway to Triphenylpyridines via Cascade Reactions Utilizing a New Iron‐Organic Framework as a Recyclable Heterogeneous Catalyst

Published: 22 March 2019

Author(s): Son H. Doan, Nhu K. Q. Tran, Phuc H. Pham, Vu H. H. Nguyen, Ngoc N. Nguyen, Phuong T. M. Ha, Shuang Li, Ha V. Le, Nhan T. H. Le, Thach N. Tu, Nam T. S. Phan

A new iron‐organic framework, VNU‐22 {[Fe3(BTC)(BPDC)2]·11.97H2O}, constructed from BTC3–, BPDC2– pillars and infinite [Fe3(CO2)7]∞ rod SBU, was obtained. The VNU‐22 was utilized as a heterogeneous catalyst in the synthesis of 2,4,6‐triphenylpyridines via cascade reactions from acetophenones and phenylacetic acids with ammonium acetate as a nitrogen source. This transformation is new. The VNU‐22 was more active in the cascade reactions than many homogeneous and heterogeneous catalysts. The...