Introducing an Extended Covalent Bond between Oxygen Atoms with an OXO-Shape in Ions and Molecules: Compatibility with the Even-Odd and the Isoelectronicity RulesReportar como inadecuado




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Building on the recent success of the even-odd rule, the present paper exploresits implications by studying the very specific case of OXO compounds. These compoundsare usually represented with double bonds linking two oxygen atoms to a centralatom—as in carbon dioxyde—yet can sometimes be drawn in a triangular structure,such as in calcium dioxyde. Measurement data moreover indicate that most OXO compoundshave an angle around 120° between oxygen atoms, although that seemsincompatible with triangular representations. The aim here is to unify thesecommonly admitted representations by linking oxygen atoms through a single bondthat is longer than usual covalent bonds: an -elongated bond-. This elongatedbond has the interesting effect of suppressing the need for double bondsbetween oxygen and the central atom. The elongated bond concept is applied toabout a hundred of molecules and ions and methodically compared to classicalrepresentations. It is shown that this new representation, associated to theeven-odd rule, is compatible with all studied compounds and can be used inplace of their classical drawings. Its usage greatly simplifies complexconcepts like resonance and separated charges in gases. Elongated bonds arealso shown to be practicable with the isoelectronic rule as well as isomers,and throughout chemical reactions. This study of an especially long and wideangle bond confirms the versatility of the even-odd rule: it is not limited tocompounds with short covalent bonds and can include OO covalent bond lengths ofmore than 200 pm and with OXO angles above 90°.

KEYWORDS

Elongated Bond, Covalent Bond, Even-Odd, Double Bond, Isoelectronicity, Rules, Chemistry, Ions, Molecule

Cite this paper

Auvert, G. and Auvert, M. 2016 Introducing an Extended Covalent Bond between Oxygen Atoms with an OXO-Shape in Ions and Molecules: Compatibility with the Even-Odd and the Isoelectronicity Rules. Open Journal of Physical Chemistry, 6, 67-77. doi: 10.4236-ojpc.2016.63007.





Autor: Geoffroy Auvert1, Marine Auvert2

Fuente: http://www.scirp.org/



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