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2022 ◽  
Author(s):  
Aleksandra Mrzygłód ◽  
Maciej Kubicki ◽  
Beata Dudziec
Keyword(s):  

This is the first report on the synthesis of dendritic systems with double-decker SQs used as cores. A two-step synthetic protocol is presented to obtain G1.5 dendrimers with –SiCH2Cl reactive moieties for easy modification in the next stages.


Author(s):  
Monika Rzonsowska ◽  
Katarzyna Mituła ◽  
Julia Duszczak ◽  
Małgorzata Kasperkowiak ◽  
Rafał Januszewski ◽  
...  

This paper outlines an unexpected type of intramolecular transformation of DDSQ during hydrolytic condensation and surprising catalytic reactivity in silylative coupling.


2021 ◽  
Author(s):  
Liam Dekel ◽  

Seven hundred and fifty nine thousand people (Elflein, 2021). Friends, family, and strangers all over the United States have died from COVID-19. One can blame many things, but personally, I blame America’s horrible healthcare system that supports the rich and drives a double-decker bus over the poor. In a time when people are coming back together while COVID is still running rampant, what we need is a secure healthcare system that can protect our families and friends.


2021 ◽  
Vol 923 (2) ◽  
pp. 142
Author(s):  
Jialin Chen ◽  
Yingna Su ◽  
Rui Liu ◽  
Bernhard Kliem ◽  
Qingmin Zhang ◽  
...  

Abstract We investigate the failed partial eruption of a filament system in NOAA AR 12104 on 2014 July 5, using multiwavelength EUV, magnetogram, and Hα observations, as well as magnetic field modeling. The filament system consists of two almost co-spatial segments with different end points, both resembling a C shape. Following an ejection and a precursor flare related to flux cancellation, only the upper segment rises and then displays a prominent twisted structure, while rolling over toward its footpoints. The lower segment remains undisturbed, indicating that the system possesses a double-decker structure. The erupted segment ends up with a reverse-C shape, with material draining toward its footpoints, while losing its twist. Using the flux rope insertion method, we construct a model of the source region that qualitatively reproduces key elements of the observed evolution. At the eruption onset, the model consists of a flux rope atop a flux bundle with negligible twist, which is consistent with the observational interpretation that the filament possesses a double-decker structure. The flux rope reaches the critical height of the torus instability during its initial relaxation, while the lower flux bundle remains in stable equilibrium. The eruption terminates when the flux rope reaches a dome-shaped quasi-separatrix layer that is reminiscent of a magnetic fan surface, although no magnetic null is found. The flux rope is destroyed by reconnection with the confining overlying flux above the dome, transferring its twist in the process.


Silicon ◽  
2021 ◽  
Author(s):  
David F. Vogelsang ◽  
Robert E. Maleczka ◽  
Andre Lee
Keyword(s):  

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4771
Author(s):  
Nirmal K. Shee ◽  
Ju-Won Seo ◽  
Hee-Joon Kim

This article studies the supramolecular assembly behavior of a Zn-trisporphyrin conjugate containing a triphenylamine core (1) with bridging N-donor ligands using the UV-vis spectrophotometric titration method at micromolar concentrations. Our results show that pyridine, a non-bridging ligand, formed a 3:1 open complex with 1. The corresponding binding constant was estimated to be (2.7 ± 0.15) × 1014 M−3. In contrast, bridging ligands, 4,4-bipyridine (BIPY) and 1,3-di(4-pyridyl)propane (DPYP), formed stable 3:2 double-decker complexes with 1 in solution, which collapsed to yield a 3:1 open complex when excess BIPY or DPYP was added. The binding constants for forming BIPY and DPYP double-decker complexes were estimated to be (9.26 ± 0.07) × 1027 M−4 and (3.62 ± 0.16) × 1027 M−4, respectively. The UV-vis titration profiles supported the conclusion that the degradation of the 3:2 double-decker 1∙BIPY complex is less favorable compared to that of 1∙DPYP. Consequently, the formation of the 3:1 1∙DPYP open complex proceeded more readily than that of 1∙BIPY.


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