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Synthesis and crystal structure of the heteroleptic lanthanum(III) bis-diphosphinomethanide complex [La{CH(PPh2)2}2(I)(THF)2]

Lookup NU author(s): Dr Stephen Liddle, Dr Keith Izod


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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. © 2006 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Liddle ST, Izod K

Publication type: Note

Publication status: Published

Journal: Journal of Organometallic Chemistry

Year: 2006

Volume: 691

Issue: 11

Pages: 2599-2603

ISSN (print): 0022-328X

ISSN (electronic): 1872-8561


DOI: 10.1016/j.jorganchem.2006.02.012