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Article

Metal–Metal Bond in the Light of Pauling’s Rules

by 1,*, 1 and 2,3,*
1
Department of Chemistry, Bar-Ilan University, Ramat-Gan 5290002, Israel
2
CNR-SCITEC Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, sezione di via Golgi, via Golgi 19, I-20133 Milano, Italy
3
Istituto Lombardo Accademia di Scienze e Lettere, via Brera 28, I-20121 Milano, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: M. Esmail Alikhani
Molecules 2021, 26(2), 304; https://doi.org/10.3390/molecules26020304
Received: 22 December 2020 / Revised: 5 January 2021 / Accepted: 6 January 2021 / Published: 8 January 2021
About 70 years ago, in the framework of his theory of chemical bonding, Pauling proposed an empirical correlation between the bond valences (or effective bond orders (BOs)) and the bond lengths. Till now, this simple correlation, basic in the bond valence model (BVM), is widely used in crystal chemistry, but it was considered irrelevant for metal–metal bonds. An extensive analysis of the quantum chemistry data computed in the last years confirms very well the validity of Pauling’s correlation for both localized and delocalized interactions. This paper briefly summarizes advances in the application of the BVM for compounds with TM–TM bonds (TM = transition metal) and provides further convincing examples. In particular, the BVM model allows for very simple but precise calculations of the effective BOs of the TM–TM interactions. Based on the comparison between formal and effective BOs, we can easily describe steric and electrostatic effects. A possible influence of these effects on materials stability is discussed. View Full-Text
Keywords: bond order; metal–metal bond; bond valence sum; steric effect; electrostatic effect; material stability bond order; metal–metal bond; bond valence sum; steric effect; electrostatic effect; material stability
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MDPI and ACS Style

Levi, E.; Aurbach, D.; Gatti, C. Metal–Metal Bond in the Light of Pauling’s Rules. Molecules 2021, 26, 304. https://doi.org/10.3390/molecules26020304

AMA Style

Levi E, Aurbach D, Gatti C. Metal–Metal Bond in the Light of Pauling’s Rules. Molecules. 2021; 26(2):304. https://doi.org/10.3390/molecules26020304

Chicago/Turabian Style

Levi, Elena, Doron Aurbach, and Carlo Gatti. 2021. "Metal–Metal Bond in the Light of Pauling’s Rules" Molecules 26, no. 2: 304. https://doi.org/10.3390/molecules26020304

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