Unexpected room-temperature phosphorescence from a non-aromatic, low molecular weight, pure organic molecule through the intermolecular hydrogen bond

2018 ◽  
Vol 2 (11) ◽  
pp. 2124-2129 ◽  
Author(s):  
Manman Fang ◽  
Jie Yang ◽  
Xueqin Xiang ◽  
Yujun Xie ◽  
Yongqiang Dong ◽  
...  

The first example of a pure non-aromatic organic small molecule, cyanoacetic acid (CAA), with unexpected persistent RTP behavior is reported, which possesses the RTP lifetime as long as 862 ms.

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 29 ◽  
Author(s):  
Alex Abramov ◽  
Hendrik Vernickel ◽  
César Saldías ◽  
David Díaz Díaz

In this work we have investigated the potential benefits of using supramolecular gel networks as reaction media to carry out air-sensitive metal-free light-induced trifluoromethylation of six-membered (hetero)arenes under aerobic conditions. This reaction was performed at room temperature (RT) using sodium triflinate (CF3SO2Na, Langlois’ reagent) as a source of radicals and diacetyl as electron donor. The effects of confinement in gel media, concentration of reactants, and type of light source on yield and product distribution were evaluated and compared to the results obtained in homogeneous solution. Four different low molecular weight (LMW) gelators were employed in this study. The results confirmed the blocking effect of the gel medium against reaction quenching by external oxygen, as well as a certain control on the kinetics and selectivity.


CORROSION ◽  
1961 ◽  
Vol 17 (1) ◽  
pp. 11t-20t ◽  
Author(s):  
RONALD L. DeHOFF

Abstract The epoxy resins most widely used in corrosion prevention are liquids of low molecular weight which can be converted to hard, tough, chemically resistant polymers by the use of various curing agents. Unlike other thermosetting resins such as polyesters, the curing agents may produce chemical linkages in the final polymers that differ from those present in the uncured form. Hence, the properties of cured epoxy resins are likely dependent upon, and may even reflect the properties of the curing agent used. Some seven different epoxy resin systems were exposed to various chemical environments and evaluatd for changes in dimensional stability and flexural strengths over a six month period. From the data presented herein, only limited conclusions may be drawn. Heat cured systems fare better than room temperature cured systems in every case. Anhydride cured epoxy resins show greater resistance to outdoor weathering than amine cured systems. 5.4.5, 6.6.8


2019 ◽  
Vol 52 (6) ◽  
pp. 2495-2503 ◽  
Author(s):  
Yan-Fang Zhang ◽  
Yue-Chao Wang ◽  
Xiao-Song Yu ◽  
Yang Zhao ◽  
Xiang-Kui Ren ◽  
...  

2013 ◽  
Vol 42 (3) ◽  
pp. 232-234 ◽  
Author(s):  
Mi Yeon Lee ◽  
Won Jin Lee ◽  
Arup Kumer Roy ◽  
Kang Seok Lee ◽  
Sung Young Park ◽  
...  

2013 ◽  
Vol 53 (12) ◽  
pp. 2594-2602 ◽  
Author(s):  
Lei Caihong ◽  
Wu Shuqiu ◽  
Xu Ruijie ◽  
Peng Xinlong ◽  
Shi Wenqiang ◽  
...  

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