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Inorganics 2017, 5(2), 26;

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

Institut für Anorganische Chemie, University of Tübingen (EKUT) Auf der Morgenstelle 18, 72076 Tübingen, Germany
School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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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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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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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