Bond strength variation with atomic

R = Me, Bu. Compounds of the series with 244 X = / -Me, j9-NH2, / -Br are monomeric. Compounds of the series with X groups in orffro-positions show dimeric structure and have heptacoordinated Sn atoms. The great variation of bond strength in these compounds can be appreciated from the bond lengths in the dimeric case with R = Bu and X = 0-Cl ... 

Changes in bond strength with variation of coordinative unsaturation of surface atoms are very similar to the effects of coadsorption [11]. When two adsorbate atoms share a bond with the same surface atoms, the surface atom effectively has an increased coordination number. Therefore the adatom bond strength is weaker than when there is no sharing between metal surface atoms. The heat of adsorption generally decreases at high adsorbate surface coverage as a result of this effect. 

Variation of bond strength with electronegativities of metal ions and ligand donor atoms. 

Because the bond overlap population (Pb) between valence atomic orbitals is a good indication for the strength of covalent bonding for molecules, the relativistic change (APb) in Pb corresponds to the change in bond strength that is connected with bond-length. In addition, APb is directly related to the relativistic variation... 

Various criteria, such as ir spectra, are used to do the rating. Because 7r-bonding is so important with neutral metal atoms, the order is very roughly that of decreasing bond strengths as well. However the variation from one end to the other is surprisingly small, about 10 kcal/mol. This results from the best a-donors being at the end of the list. 

In summary, the variation in the reactivity of the DNA bases in the presence of a weak external electric field indicates that when the field is applied parallel and toward the atoms forming the H-bonds, in all the DNA bases, the GRDs (p and ii) decrease with the increase in electric field strength, and the variation with the field is not always linear. The nonlinearity in the behavior of the reactivity descriptors in such external electric field may be attributed to the complexity in the molecule. 

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