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Inorganics 2017, 5(2), 26; doi:10.3390/inorganics5020026

Potassium C–F Interactions and the Structural Consequences in N,N′-Bis(2,6-difluorophenyl)formamidinate Complexes

1
Institut für Anorganische Chemie, University of Tübingen (EKUT) Auf der Morgenstelle 18, 72076 Tübingen, Germany
2
School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
3
College of Science & Engineering, James Cook University, Townsville, Queensland 4811, Australia
*
Authors to whom correspondence should be addressed.
Received: 27 March 2017 / Revised: 11 April 2017 / Accepted: 11 April 2017 / Published: 17 April 2017
(This article belongs to the Special Issue s-Block Metal Complexes)
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Abstract

Treatment of K[N(SiMe3)2] with N,N′-bis(2,6-difluorophenyl)formamidine (DFFormH) in toluene, resulted in the formation of [K(DFForm)]∞ (1) as a poorly soluble material. Upon dissolution in thf and layering with n-hexane, 1 was crystallised and identified as a two-dimensional polymer, in which all fluorine and nitrogen atoms, and also part of one aryl group, bridge between four symmetry equivalent potassium ions, giving rise to a completely unique μ4-(N,N′,F,F′):(N,N′):η4(Ar-C(2,3,4,5,6)):(F″,F′′′) DFForm coordination. The two-dimensional nature of the polymer could be deconstructed to one dimension by crystallisation from neat thf at −35 °C, giving [K2(DFForm)2(thf)2]∞ (2), where the thf molecules bridge the monomeric units. Complete polymer dissociation was observed when 1 was crystallised from toluene/n-hexane mixtures in the presence of 18-crown-6, giving [K(DFForm)(18-crown-6)] (3), which showed unprecedented κ(N,Cispo,F) DFForm coordination, rather than the expected κ(N,N′) coordination. View Full-Text
Keywords: potassium; formamidinate; C–F bond; coordination chemistry potassium; formamidinate; C–F bond; coordination chemistry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Werner, D.; Deacon, G.B.; Junk, P.C. Potassium C–F Interactions and the Structural Consequences in N,N′-Bis(2,6-difluorophenyl)formamidinate Complexes. Inorganics 2017, 5, 26.

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