Synthesis and crystal structure of the heteroleptic lanthanum(III) bis-diphosphinomethanide complex [La{CH(PPh2)2}2(I)(THF)2] |
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| Authors: | Stephen T Liddle Keith Izod |
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| Institution: | a School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
b Chemistry, School of Natural Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, UK |
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| Abstract: | Treatment of CH2(PPh2)2 with n-BuLi/t-BuOK in diethyl ether affords the potassium diphosphinomethanide complex K{CH(PPh2)2}(OEt2)0.5] (1) in high yield. Metathesis of two equivalents of 1 with LaI3(THF)4 yields the heteroleptic bis-diphosphinomethanide complex La{CH(PPh2)2}2(I)(THF)2] (2). X-ray crystallography shows the diphosphinomethanide ligands in 2 adopt different coordination modes in the solid state; one adopts a κ2-PP mode with no La-C contact, and the other adopts an η3-PCP mode, thus giving an eight-coordinate lanthanum centre. |
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| Keywords: | Lanthanum(III) P-ligands Diphosphinomethanide Crystal structure Heteroleptic |
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