Selective P 4 Activation by a Highly Reduced Cobaltate: Synthesis of Dicobalt Tetraphosphido Complexes

Although the chemistry of transition metal polyphosphide anions has attracted significant attention, there are few reports of studies in which such species have been synthesized directly from white phosphorus. [K(OEt ) {Co(BIAN)(cod)}] (1, BIAN=1,2-bis(2,6-diisopropylphenylimino)acenaphthene, cod=1,...

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Veröffentlicht in:Chemistry : a European journal 2017-05, Vol.23 (25), p.6094-6102
Hauptverfasser: Pelties, Stefan, Maier, Thomas, Herrmann, Dirk, de Bruin, Bas, Rebreyend, Christophe, Gärtner, Stefanie, Shenderovich, Ilya G, Wolf, Robert
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container_end_page 6102
container_issue 25
container_start_page 6094
container_title Chemistry : a European journal
container_volume 23
creator Pelties, Stefan
Maier, Thomas
Herrmann, Dirk
de Bruin, Bas
Rebreyend, Christophe
Gärtner, Stefanie
Shenderovich, Ilya G
Wolf, Robert
description Although the chemistry of transition metal polyphosphide anions has attracted significant attention, there are few reports of studies in which such species have been synthesized directly from white phosphorus. [K(OEt ) {Co(BIAN)(cod)}] (1, BIAN=1,2-bis(2,6-diisopropylphenylimino)acenaphthene, cod=1,5-cyclooctadiene), which is readily prepared by ligand exchange from [K(thf) {Co(cod) }], reacts with P to afford [{K(thf)} {(BIAN)Co} (μ-η :η -P )] (2 a) in 61 % yield (isolated product). [{K(OEt )} {(BIAN)Co} (μ-η :η -P )] (2 b) and [K([18]crown-6)(MeCN)] [{(BIAN)Co} (μ-η :η -P )] (2 c) were obtained by recrystallizing 2 a from diethyl ether and acetonitrile (and using [18]crown-6 in case of 2 c). Oxidation of 2 a with [Cp Fe]BAr (one equivalent) and subsequent recrystallization of the product from different solvents gave [K(OEt ){(BIAN)Co} (μ-η :η -P )] (3 a) and [K(dme) ][{(BIAN)Co} (μ-η :η -P )] (3 b; dme=1,2-dimethoxyethane). Neutral [{(BIAN)Co} (μ-η :η -P )] (4) was obtained in moderate yield by oxidizing 2 a with two equivalents of [Cp Fe]BAr . The new complexes were characterized by NMR, EPR (in the case of 3 a), and UV/Vis spectroscopy, and elemental analysis. The molecular structures revealed by X-ray crystallography display planar cyclic or open-chain P units sandwiched between {(BIAN)Co} fragments.
doi_str_mv 10.1002/chem.201603296
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[K(OEt ) {Co(BIAN)(cod)}] (1, BIAN=1,2-bis(2,6-diisopropylphenylimino)acenaphthene, cod=1,5-cyclooctadiene), which is readily prepared by ligand exchange from [K(thf) {Co(cod) }], reacts with P to afford [{K(thf)} {(BIAN)Co} (μ-η :η -P )] (2 a) in 61 % yield (isolated product). [{K(OEt )} {(BIAN)Co} (μ-η :η -P )] (2 b) and [K([18]crown-6)(MeCN)] [{(BIAN)Co} (μ-η :η -P )] (2 c) were obtained by recrystallizing 2 a from diethyl ether and acetonitrile (and using [18]crown-6 in case of 2 c). Oxidation of 2 a with [Cp Fe]BAr (one equivalent) and subsequent recrystallization of the product from different solvents gave [K(OEt ){(BIAN)Co} (μ-η :η -P )] (3 a) and [K(dme) ][{(BIAN)Co} (μ-η :η -P )] (3 b; dme=1,2-dimethoxyethane). Neutral [{(BIAN)Co} (μ-η :η -P )] (4) was obtained in moderate yield by oxidizing 2 a with two equivalents of [Cp Fe]BAr . The new complexes were characterized by NMR, EPR (in the case of 3 a), and UV/Vis spectroscopy, and elemental analysis. 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[K(OEt ) {Co(BIAN)(cod)}] (1, BIAN=1,2-bis(2,6-diisopropylphenylimino)acenaphthene, cod=1,5-cyclooctadiene), which is readily prepared by ligand exchange from [K(thf) {Co(cod) }], reacts with P to afford [{K(thf)} {(BIAN)Co} (μ-η :η -P )] (2 a) in 61 % yield (isolated product). [{K(OEt )} {(BIAN)Co} (μ-η :η -P )] (2 b) and [K([18]crown-6)(MeCN)] [{(BIAN)Co} (μ-η :η -P )] (2 c) were obtained by recrystallizing 2 a from diethyl ether and acetonitrile (and using [18]crown-6 in case of 2 c). Oxidation of 2 a with [Cp Fe]BAr (one equivalent) and subsequent recrystallization of the product from different solvents gave [K(OEt ){(BIAN)Co} (μ-η :η -P )] (3 a) and [K(dme) ][{(BIAN)Co} (μ-η :η -P )] (3 b; dme=1,2-dimethoxyethane). Neutral [{(BIAN)Co} (μ-η :η -P )] (4) was obtained in moderate yield by oxidizing 2 a with two equivalents of [Cp Fe]BAr . The new complexes were characterized by NMR, EPR (in the case of 3 a), and UV/Vis spectroscopy, and elemental analysis. 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