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Metalation of 2‐Quinolyl‐Linked (Boranophosphinoyl)methane −Alkali Metal, Alkaline Earth Metal, and Ytterbium(II) Complexes of Monoanionic [CH(iPr2P−BH3)(C9H6N‐2)]− Ligand

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Alkali and alkaline-earth metal complexes, and an Yb(II)-crown ether complex derived from a 2-quinolyl-linked (borano-phosphinoyl)methane have been synthesized and structurally characterized. These complexes exhibit diversified structures in which the deprotonated (borano-phosphinoyl)methane ligand bonds to the metals in various coordination modes.


Abstract

A series of alkali and alkaline earth metal complexes, and an ytterbium(II) complex of monoanionic [CH( i Pr2P−BH3)(C9H6N-2)] ligand (abbreviated as LQPB ) were synthesized. Lithium complexes [Li(LQPB )(TMEDA)] (2, TMEDA=Me2NCH2CH2NMe2) and [Li(LQPB )(12-crown-4)] (3) were prepared by lithiation of 1 with Li n Bu in the presence of TMEDA and 12-crown-4 ether, respectively. Treatment of 2 with NaO t Bu and KO t Bu, respectively, followed by addition of 18-crown-6 ether yielded monomeric sodium complex [Na(LQPB )(18-crown-6)] (4) and polymeric potassium derivative [K(LQPB )(18-crown-6)]n (5). Metalation of 1 with Mg n Bu2/TMEDA afforded [Mg(LQPB )2(TMEDA)] (6). Heavier group 2 complexes [Ca(LQPB )2(DME)2] (7), [Sr(LQPB )2]2 (8) and [Ba(LQPB )2(DME)] (9) were synthesized by metalation of 1 with the corresponding alkaline earth metal amide M[N(SiMe3)2]2(DME)n (M=Ca or Ba, n=2; M=Sr, n=0) in toluene under reflux conditions. Treatment of YbI2(THF)2 with potassium complex 5 led to isolation of mononuclear Yb(II) complex [Yb(LQPB )2(18-crown-6)] (10).

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