K+···Cπ and K+···F Non-Covalent Interactions in π-Functionalized Potassium Fluoroalkoxides

Sorin-Claudiu Roşca,Thierry Roisnel,Vincent Dorcet,Jean-François Carpentier,Hanieh Roueindeji,Yann Sarazin

doi:10.3390/inorganics5010013

Abstract

Secondary interactions stabilize coordinatively demanding complexes of s-block metals [...]

Highlights

Complexes of the electropositive alkali and alkalino-earth metals are characterized by ionic bonding between the cation and the ligands and co-ligands
This is perhaps best epitomized in the structure of the arene complex [1]4, where the four potassium centers display different coordination environments
The potassium–alkyne complex described here is the only one of this type. This is in line with the recent account of the utilization of π ligands in alkaline-earth chemistry [19,20]

Summary

Introduction

Complexes of the electropositive alkali and alkalino-earth metals are characterized by ionic bonding between the cation and the ligands and co-ligands. The concept of so-called secondary interactions, which are essentially weak donor–acceptor interactions between the cation and charge-neutral Cπ , halide, H, or other neutral atom or group of atoms, was highlighted in a landmark article by Ruhlandt-Senge and coworkers in 2010 [1] This and other groups have in particular prepared many a compound of alkali metals (M) featuring one or more M+ ···F [2,3,4,5,6] and, perhaps more prominently, M+ ···Cπ (arene) [4,7] intramolecular interactions. Many such complexes have been structurally characterized; there are nearly 300 referenced X-ray structures to date in the Cambridge Structural Database (CSD) for η6 -coordinated K+ ···Cπ (arene) compounds alone

Methods

Results

Conclusion