Structural effects of alkali-metals on the B12 skeleton

2020 ◽  
Vol 22 (30) ◽  
pp. 17344-17350
Author(s):  
Gerardo Hernández-Juárez ◽  
Estefanía Ravell ◽  
Jessica Arcudia ◽  
Ximena Zarate ◽  
Zhong-hua Cui ◽  
...  
Keyword(s):  
Alkali Metals ◽  
Global Minimum ◽  
Planar Structure ◽  
Structural Effects ◽  
Double Ring ◽  
Ring Geometry

For B12E− (E = Li–Cs) clusters, a cage-type and a quasi-planar structure compete to be the global minimum. For B12E2, the competition is between a quasi-planar and a double-ring geometry. Why do some alkali-metals cause such a radical distortion?

ChemInform Abstract: Structural Effects in Ion Pairs from 1,3-Diarylbenzo(c)furans and Alkali Metals: An EPR and ENDOR Study

ChemInform ◽  
2010 ◽  
Vol 22 (36) ◽  
pp. no-no
Author(s):  
M. L. T. M. B. FRANCO ◽  
M. C. R. L. R. LAZANA ◽  
B. J. HEROLD
Keyword(s):  
Alkali Metals ◽  
Ion Pairs ◽  
Structural Effects

scholarly journals Planar Hexacoordinate Carbons: Half Covalent Half Ionic

2020 ◽  
Author(s):  
luis leyva-parra ◽  
Luz Diego ◽  
Osvaldo Yañez ◽  
Diego Inostroza ◽  
jorge barroso ◽  
...  
Keyword(s):  
Alkali Metals ◽  
Planar Structure ◽  
Global Minima ◽  
Covalently Bonded

<div>The global minima of thirteen combinations of atoms with formula CE<sub>3</sub>M<sub>3</sub><sup>+</sup> (E=S-Te and M=Li-Cs) adopt a planar structure with carbon covalently bonded to three chalcogens and ionically bonded to the three alkali-metals to stabilize the first global minima structures containing planar hexacoordinate carbon atoms.</div>

scholarly journals Planar Hexacoordinate Carbons: Half Covalent Half Ionic

2020 ◽  
Author(s):  
luis leyva-parra ◽  
Luz Diego ◽  
Osvaldo Yañez ◽  
Diego Inostroza ◽  
jorge barroso ◽  
...  
Keyword(s):  
Alkali Metals ◽  
Planar Structure ◽  
Global Minima ◽  
Covalently Bonded

<div>The global minima of thirteen combinations of atoms with formula CE<sub>3</sub>M<sub>3</sub><sup>+</sup> (E=S-Te and M=Li-Cs) adopt a planar structure with carbon covalently bonded to three chalcogens and ionically bonded to the three alkali-metals to stabilize the first global minima structures containing planar hexacoordinate carbon atoms.</div>

The EΞE Triple Bonds (E = Group 13) Promoted by Charge Transfer From Alkali Metals

2021 ◽  
Author(s):  
Yu-Qian Liu ◽  
Meng-hui Wang ◽  
Run-Feng Huang ◽  
Lili Zhao ◽  
Zhong-Hua Cui
Keyword(s):  
Charge Transfer ◽  
Alkali Metals ◽  
Global Minimum ◽  
Group 13 ◽  
Triple Bonds

We report herein an evidence of EΞE triple bonds (E = Group 13) promoted by the perpendicularly surrounding M4 (M = Li, Na) motifs. The global minimum of E2M4 (E...

the effects of resonance with Jupiter in the system of short-period comets

1974 ◽  
Vol 22 ◽  
pp. 193-203
Author(s):  
L̆ubor Kresák
Keyword(s):  
Structural Effects ◽  
Order Resonance ◽  
Mean Motion ◽  
Short Period ◽  
The Mean ◽  
Compound Effect ◽  
Low Order

AbstractStructural effects of the resonance with the mean motion of Jupiter on the system of short-period comets are discussed. The distribution of mean motions, determined from sets of consecutive perihelion passages of all known periodic comets, reveals a number of gaps associated with low-order resonance; most pronounced are those corresponding to the simplest commensurabilities of 5/2, 2/1, 5/3, 3/2, 1/1 and 1/2. The formation of the gaps is explained by a compound effect of five possible types of behaviour of the comets set into an approximate resonance, ranging from quick passages through the gap to temporary librations avoiding closer approaches to Jupiter. In addition to the comets of almost asteroidal appearance, librating with small amplitudes around the lower resonance ratios (Marsden, 1970b), there is an interesting group of faint diffuse comets librating in characteristic periods of about 200 years, with large amplitudes of about±8% in μ and almost±180° in σ, around the 2/1 resonance gap. This transient type of motion appears to be nearly as frequent as a circulating motion with period of revolution of less than one half that of Jupiter. The temporary members of this group are characteristic not only by their appearance but also by rather peculiar discovery conditions.

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