scholarly journals Bond orders of the diatomic molecules

RSC Advances ◽  
2019 ◽  
Vol 9 (30) ◽  
pp. 17072-17092 ◽  
Author(s):  
Taoyi Chen ◽  
Thomas A. Manz
Keyword(s):  
Bond Order ◽  
Diatomic Molecules ◽  
Component Analysis ◽  
Bond Orders ◽  
Order Component

Bond orders were computed for 288 diatomics, and a new bond order component analysis (BOCA) was applied to selected diatomics.

On the π-Electron Content of Bonds and Rings in Benzenoid Hydrocarbons

2004 ◽  
Vol 59 (4-5) ◽  
pp. 295-298 ◽  
Author(s):  
Ivan Gutman ◽  
Tetsuo Morikawa ◽  
Susumu Narita
Keyword(s):  
Bond Order ◽  
Membered Ring ◽  
Electron Content ◽  
Bond Orders ◽  
Double Bonds ◽  
Benzenoid Hydrocarbons ◽  
Carbon Bond ◽  
Carbon Carbon Bond ◽  
Carbon Carbon Bonds ◽  
Single Bonds

The Pauling bond order can be viewed as a measure of the π-electron content of the respective carbon-carbon bond. In benzenoid hydrocarbons its values lie between 0 (in the case of essential single bonds) and 1 (in the case of essential double bonds). If the benzenoid molecule does not possess essential single and double bonds, then the Pauling bond orders are greater than 0 and less than 1, but may assume values arbitrarily close to 0 and 1. The π-electron content of a ring is equal to the sum of the π-electron contents of the carbon-carbon bonds forming this ring. We show that in benzenoid hydrocarbons the π-electron content of any (six-membered) ring lies between 0 and 5.5. If the molecule does not possess essential single and double bonds, then the π-electron content of any ring is greater than 0 and less than 5.5, but may assume values arbitrarily close to 0 and 5.5.

Bond order-bond length relationships in conjugated hydrocarbons - the microwave spectrum and structure of 3,4-dimethylenecyclobutene

1983 ◽  
Vol 36 (4) ◽  
pp. 639 ◽  
Author(s):  
RD Brown ◽  
PD Godfry ◽  
BT Hart ◽  
AL Ottrey ◽  
M Onda ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Ab Initio ◽  
Bond Length ◽  
Bond Order ◽  
Microwave Spectrum ◽  
Basis Set ◽  
Molecular Orbital Calculations ◽  
Bond Orders ◽  
Bond Lengths ◽  
Typical Error

The microwave spectrum of the benzene isomer 3,4-dimethylenecyclobutene including spectra of all possible single 13C-substituted and sufficient singly and doubly D-substituted species to give a complete r5 geometry, have been measured and analysed. An estimate of the re geometry has also been derived. The additional precise CC bond lengths obtained for an unsubstituted, conjugated hydrocarbon enable us to examine bond order-bond length relationships more thoroughly than has previously been possible. The CC bond lengths exhibit a noticeably better correlation with SCFMO bond orders than with simple H�ckel bond orders. Further confirmatory measurements of the dipole moment of dimethylenecyclobutene have been made. Ab initio molecular orbital calculations using a 6-31G basis set give an optimized geometry with CC bond lengths within 2 pm of the r5 values. The computed dipole moment agrees almost exactly with experiment but a corresponding calculation on fulvene is discrepant with experiment by 0.16 D, which is probably a more typical error.

Bound diatomic molecules with zero bond-order

1977 ◽  
Vol 52 (1) ◽  
pp. 171-173 ◽  
Author(s):  
Ruth Merksamer ◽  
Jacob Katriel
Keyword(s):  
Bond Order ◽  
Diatomic Molecules

scholarly journals Revitalizing the concept of bond order through delocalization measures in real space

2018 ◽  
Vol 9 (25) ◽  
pp. 5517-5529 ◽  
Author(s):  
Carlos Outeiral ◽  
Mark A. Vincent ◽  
Ángel Martín Pendás ◽  
Paul L. A. Popelier
Keyword(s):  
Bond Order ◽  
Real Space ◽  
Quantum Mechanical ◽  
Bond Orders ◽  
Exchange Correlation ◽  
Mechanical Bond ◽  
Topological Atoms

Quantum mechanical bond orders are obtained from integration of the exchange–correlation density between topological atoms.

scholarly journals Atomic Charges, Surface Electrostatic Potential Analysis, and Bond Order Analysis on Nitriles and Isocyanides

2021 ◽  
Author(s):  
Yanyun Zhao ◽  
Xueli Cheng
Keyword(s):  
Electrostatic Potential ◽  
Bond Order ◽  
Atomic Charges ◽  
Bond Orders ◽  
Potential Analysis ◽  
Order Analysis ◽  
Population Analyses ◽  
Full Optimization ◽  
Global And Local ◽  
Surface Electrostatic Potential

Abstract Isocyanide-nitrile rearrangement has long been a continuing and interesting topic. A series of nitriles and isocyanides with the substituents of R=-AlH2, -BeH, -BH2, -C ≡ CH, -CF3, -CH3, -Cl, -C ≡ N, -COOH, -F, -H, Li, -MgH, -Na, -NH2, -NO2, -OH, -PH2, -SH, -SiH3, -CH = CH2 were investigated systematically based on full optimization at B3LYP-D3(BJ)/def2-QZVP level, and the isomerization energies from R-C ≡ N to :C = N-R were estimated. The substituent effect and bonding characters were analyzed by surface ESP colored van der Waals surfaces in conjunction with the global and local electrostatic extrema, the population analyses in terms of Hirshfeld and ADCH atomic charges, and bond order analyses via Laplacian and fuzzy bond orders.

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