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The Triple-Decker Complex [Cp*Fe(µ,η55-P5)Mo(CO)3] as a Building Block in Coordination Chemistry

Department of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany
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Academic Editor: György Keglevich
Molecules 2019, 24(2), 325; https://doi.org/10.3390/molecules24020325
Received: 19 December 2018 / Revised: 11 January 2019 / Accepted: 12 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Organophosphorus Chemistry 2018)
Although the triple-decker complex [Cp*Fe(µ,η55-P5)Mo(CO)3] (2) was first reported 26 years ago, its reactivity has not yet been explored. Herein, we report a new high-yielding synthesis of 2 and the isolation of its new polymorph (2’). In addition, we study its reactivity towards AgI and CuI ions. The reaction of 2 with Ag[BF4] selectively produces the coordination compound [Ag{Cp*Fe(µ,η55-P5)Mo(CO)3}2][BF4] (3). Its reaction with Ag[TEF] and Cu[TEF] ([TEF] = [Al{OC(CF3)3}4]) leads to the selective formation of the complexes [Ag{Cp*Fe(µ,η55-P5)Mo(CO)3}2][TEF] (4) and [Cu{Cp*Fe(µ,η55-P5)Mo(CO)3}2][TEF] (5), respectively. The X-ray structures of compounds 35 each show an MI ion (MI = AgI, CuI) bridged by two P atoms from two triple-decker complexes (2). Additionally, four short MI···CO distances (two to each triple-decker complex 2) participate in stabilizing the coordination sphere of the MI ion. Evidently, the X-ray structure for compound 3 shows a weak interaction of the AgI ion with one fluorine atom of the counterion [BF4]. Such an Ag···F interaction does not exist for compound 4. These findings demonstrate the possibility of using triple-decker complex 2 as a ligand in coordination chemistry and opening a new perspective in the field of supramolecular chemistry of transition metal compounds with phosphorus-rich complexes. View Full-Text
Keywords: triple-decker; cyclo-P5; weakly coordinating; molybdenum; silver; copper triple-decker; cyclo-P5; weakly coordinating; molybdenum; silver; copper
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Elsayed Moussa, M.; Welsch, S.; Dütsch, L.; Piesch, M.; Reichl, S.; Seidl, M.; Scheer, M. The Triple-Decker Complex [Cp*Fe(µ,η55-P5)Mo(CO)3] as a Building Block in Coordination Chemistry. Molecules 2019, 24, 325.

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