Why is the bond multiplicity in C2 so elusive?

2015 ◽  
Vol 1053 ◽  
pp. 189-194 ◽  
Author(s):  
David L. Cooper ◽  
Fabio E. Penotti ◽  
Robert Ponec
Keyword(s):  
Bond Multiplicity

scholarly journals The EFG Asymmetry Parameters at 35 Cl Nuclei and the Electronic Effects in Chlorine-Containing Organic and Complex Compounds of Group IVA and VA Elements

1990 ◽  
Vol 45 (3-4) ◽  
pp. 213-218
Author(s):  
Valentin P. Feshin ◽  
Mikhail G. Voronkov
Keyword(s):  
Electron Distribution ◽  
Complex Compounds ◽  
Axially Symmetric ◽  
Electronic Effects ◽  
Chlorine Atoms ◽  
Trigonal Bipyramidal ◽  
Group Iva ◽  
Bond Multiplicity ◽  
Tetrahedral Molecules ◽  
Asymmetry Parameters

Abstract The 35 CL NQR method and, in particular, the EFG asymmetry parameters at 35 Cl nuclei were used for the solution of a number of principal problems of theoretical organic and organometallic chemistry, such as the mechanism of non-induction influence of the heteroatom M on the atom Y in the non-linear Y-Z-M or Y-Z = M group, M-Cl bond multiplicity in planar molecular fragments and the asymmetry of halogen atom electron distribution in organic and organometallic molecules. In tetrahedral molecules this distribution is nearly axially symmetric for different M. This symmetry is also characteristic for axial chlorine atoms in trigonal-bipyramidal and octahedral molecules, independently of M. The deviation of the electron distribution of equatorial chlorine atoms from axial symmetry in the two latter cases depends essentially upon M and does not depend much on the peculiarity of the formation of these polyhedra and the character and number of substituents.

Insensitivity of the Nb−Nb Distance in a Paddle-Wheel Compound to Bond Multiplicity and Axial Ligation

2001 ◽  
Vol 40 (6) ◽  
pp. 1399-1401 ◽  
Author(s):  
Maryam Tayebani ◽  
Khalil Feghali ◽  
Sandro Gambarotta ◽  
Glenn P. A. Yap
Keyword(s):  
Paddle Wheel ◽  
Axial Ligation ◽  
Bond Multiplicity

On the maximum bond multiplicity of carbon: unusual C≣U quadruple bonding in molecular CUO

2012 ◽  
Vol 3 (9) ◽  
pp. 2786 ◽  
Author(s):  
Han-Shi Hu ◽  
Yi-Heng Qiu ◽  
Xiao-Gen Xiong ◽  
W. H. Eugen Schwarz ◽  
Jun Li
Keyword(s):  
Bond Multiplicity

Reactions of the ethyl radical I. Metathesis with unsaturated hydrocarbons

1958 ◽  
Vol 244 (1238) ◽  
pp. 289-296 ◽  
Keyword(s):  
Molecular Structure ◽  
Experimental Error ◽  
Frequency Factor ◽  
Energy Of Activation ◽  
Kcal Mole ◽  
Hydrogen Atoms ◽  
Common Value ◽  
Ethyl Radical ◽  
Molecular Reactivity ◽  
Bond Multiplicity

The kinetic study of the abstraction of the hydrogen atom from selected hydrocarbons by the ethyl radical reveals a natural correspondence between molecular structure and molecular reactivity. Values of the energy of activation of the series n -heptane, 1-heptene and 1-heptyne are distinct at 10·6 ± 0·4, 8·3 ± 0·5 and 7·6 ± 0·2 kcal mole -1 , respectively, and illustrate the activating influence of bond multiplicity. The group of olefines: 1-heptene, 1-octene, cyclo hexene and trans -4-octene appear to share a common value of 8·3 kcal mole -1 for the energy of activation, within the limits of experimental error. Values of the frequency factor correspond closely to the numbers of equivalent hydrogen atoms in the molecule of the hydrocarbons.

Bond length and bond multiplicity: σ-bond prevents short π-bonds

2006 ◽  
pp. 2164-2166 ◽  
Author(s):  
Eluvathingal D. Jemmis ◽  
Biswarup Pathak ◽  
R. Bruce King ◽  
Henry F. Schaefer III
Keyword(s):  
Bond Length ◽  
Bond Multiplicity
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