Nitrogen-centered radical reaction leading to energetic materials: a mild and efficient access to N–N bridged compounds

2021 ◽  
Vol 9 (38) ◽  
pp. 21685-21688
Author(s):  
Zhiwei Zeng ◽  
Yuji Liu ◽  
Guangbin Cheng ◽  
Wei Huang ◽  
Hao Wei ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Room Temperature ◽  
High Efficiency ◽  
Radical Reaction ◽  
Efficient Access ◽  
External Assistance

A novel nitrogen-centered radical reaction leading to the formation of an N–N coupled biheterocycle was discovered, which features high efficiency and greenness at room temperature without external assistance.

Clustering-Triggered Efficient Room Temperature Phosphorescence from Nonconventional Luminophores

2019 ◽  
Author(s):  
Shuyuan Zheng ◽  
Taiping Hu ◽  
Xin Bin ◽  
Yunzhong Wang ◽  
Yuanping Yi ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Spin Orbit Coupling ◽  
Design Rationale ◽  
Emission Mechanism ◽  
Room Temperature Phosphorescence ◽  
Electronic Interactions ◽  
Energy Gaps ◽  
Theoretical Results

Pure organic room temperature phosphorescence (RTP) and luminescence from nonconventional luminophores have gained increasing attention. However, it remains challenging to achieve efficient RTP from unorthodox luminophores, on account of the unsophisticated understanding of the emission mechanism. Here we propose a strategy to realize efficient RTP in nonconventional luminophores through incorporation of lone pairs together with clustering and effective electronic interactions. The former promotes spin-orbit coupling and boost the consequent intersystem crossing, whereas the latter narrows energy gaps and stabilizes the triplets, thus synergistically affording remarkable RTP. Experimental and theoretical results of urea and its derivatives verify the design rationale. Remarkably, RTP from thiourea solids with unprecedentedly high efficiency of up to 24.5% is obtained. Further control experiments testify the crucial role of through-space delocalization on the emission. These results would spur the future fabrication of nonconventional phosphors, and moreover should advance understanding of the underlying emission mechanism.<br>

Electrochemical Oxidative Esterification of Thiophenols: Efficient Access to Sulfinic Esters

2020 ◽  
Vol 17 (7) ◽  
pp. 540-547
Author(s):  
Chun-Hui Yang ◽  
Cheng Wu ◽  
Jun-Ming Zhang ◽  
Xiang-Zhang Tao ◽  
Jun Xu ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Efficient Method ◽  
High Efficiency ◽  
Building Blocks ◽  
Constant Current ◽  
Good Efficiency ◽  
Oxidative Esterification ◽  
Efficient Access ◽  
New Applications ◽  
Sulfinic Esters

Background: The sulfinic esters are important and useful building blocks in organic synthesis. Objective: The aim of this study was to develop a simple and efficient method for the synthesis of sulfinic esters. Materials and Methods: Constant current electrolysis from thiols and alcohols was selected as the method for the synthesis of sulfinic esters. Results and Discussion: A novel electrochemical method for the synthesis of sulfinic esters from thiophenols and alcohols has been developed. Up to 27 examples of sulfinic esters have been synthesized using the current methods. This protocol shows good functional group tolerance as well as high efficiency. In addition, this protocol can be easily scaled up with good efficiency. Notably, heterocycle-containing substrates, including pyridine, thiophene, and benzothiazole, gave the desired products in good yields. A plausible reaction mechanism is proposed. Conclusion: This research not only provides a green and efficient method for the synthesis of sulfinic esters but also shows new applications of electrochemistry in organic synthesis. It is considered that this green and efficient synthetic protocol used to prepare sulfinic esters will have good applications in the future.

Fast, high-efficiency, and homogeneous room-temperature cathodoluminescence of ZnO scintillator thin films on sapphire

2006 ◽  
Vol 89 (24) ◽  
pp. 243510 ◽  
Author(s):  
M. Lorenz ◽  
R. Johne ◽  
T. Nobis ◽  
H. Hochmuth ◽  
J. Lenzner ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
High Efficiency

Barium calcium titanate @carbon hybrid materials for high-efficiency room-temperature pyrocatalysis

2021 ◽  
Author(s):  
Huiying Wang ◽  
Yanmin Jia ◽  
Taosheng Xu ◽  
Xiaoxin Shu ◽  
Yiming He ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Room Temperature ◽  
High Efficiency ◽  
Calcium Titanate

A mild heteroatom (O-, N-, and S-) methylation protocol using trimethyl phosphate (TMP)-Ca(OH)2 combination

Synthesis ◽  
2022 ◽  
Author(s):  
Yu Tang ◽  
Biao Yu
Keyword(s):  
Cost Efficiency ◽  
Room Temperature ◽  
High Efficiency ◽  
Attractive Alternative ◽  
Indole Derivatives ◽  
Trimethyl Phosphate ◽  
Environmental Friendly ◽  
Operational Simplicity

A mild heteroatom methylation protocol using trimethyl phosphate (TMP)-Ca(OH)2 combination has been developed, which proceeds in DMF, or water, or under neat conditions at 80 oC or at room temperature. A series of O-, N- and S-nucleophiles, including phenols, sulfonamides, N-heterocycles such as 9H-carbazole, indole derivatives, 1,8-naphthalimide, and aryl/alkyl thiols are suitable substrates of this protocol. The high efficiency, operational simplicity, scalability, cost-efficiency, and environmental friendly nature of this protocol make it an attractive alternative to the conventional base prompted heteroatom methylation procedures.

Modulating room temperature spin injection into GaN towards the high-efficiency spin-light emitting diodes

2020 ◽  
Vol 13 (4) ◽  
pp. 043006 ◽  
Author(s):  
Anke Song ◽  
Jiajun Chen ◽  
Jinshen Lan ◽  
Deyi Fu ◽  
Jiangpeng Zhou ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Spin Injection ◽  
Light Emitting

Inactivation of microbes on fruit surfaces using photodynamic therapy and its influence on the postharvest shelf-life of fruits

2020 ◽  
Vol 26 (8) ◽  
pp. 696-705
Author(s):  
Xu Zhang ◽  
Juan Wu ◽  
Chuanshan Xu ◽  
Na Lu ◽  
Yuan Gao ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Shelf Life ◽  
Food Industry ◽  
Room Temperature ◽  
High Efficiency ◽  
Anaerobic Bacteria ◽  
Optimum Concentration ◽  
Thermal Sterilization ◽  
Facultative Anaerobic Bacteria ◽  
Total Bacteria

In this study, the disinfection effect of curcumin-mediated photodynamic therapy on the contact surfaces of fresh fruit was investigated. Our results showed that the optimum concentration of curcumin and the energy density required were 0.5 μM and 7.2 J/cm2, respectively. Photodynamic therapy showed an excellent disinfection rate for the fresh fruits with a reduction of more than 80% in the total bacteria and coliform counts. The photodynamic therapy inhibited species that belonged to the categories of gram-negative and facultative anaerobic bacteria, except for two species of the Trichoderma fungus. Importantly, photodynamic therapy prolonged the shelf-life of grapes for two days at room temperature. Therefore, photodynamic therapy should be commercialized as a high efficiency and non-thermal sterilization technology for use in the food industry.

scholarly journals Unbeeinflußbarkeit ihrer Wirkung auf Ribonuclease durch Cystamin und tiefe Temperaturen

1966 ◽  
Vol 21 (12) ◽  
pp. 1165-1170 ◽  
Author(s):  
H. Jung
Keyword(s):  
Cross Section ◽  
Low Temperatures ◽  
Room Temperature ◽  
High Efficiency ◽  
Reduction Factor ◽  
Biological Damage ◽  
Nuclear Collisions ◽  
Different Temperatures ◽  
Fast Protons ◽  
Mev Protons

Slow protons having energies below 1.5 keV dissipate their kinetic energy in matter through elastic nuclear collisions. By this process atoms are displaced out from their original positions in macromolecules. This was recently shown to cause biological damage with high efficiency. Experiments are described to test the possibility of modifying the sensitivity of ribonuclease towards elastic collisions by protective agents and by low temperatures. When cystamine is present during irradiation dry ribonuclease is protected against the action of “ionizing” fast protons (2 MeV), the dose reduction factor being 1.8. But no protection is observed when inactivation is achieved by elastic nuclear collisions (proton energy 1 keV and 1.4 keV). Similar results were obtained when the irradiations were carried out at different temperatures. Using 2 MeV protons the radiosensitivity of ribonuclease was found to be 3 times higher at room temperature than at 125 °K, but when using slow protons of 1.4 keV energy the inactivation cross section turned out to be independent of temperature. This shows that the action of elastic nuclear collisions can be modified neither by cystamine nor by low temperatures.

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