Thermally stable lead(II) amidinates and guanidinates

Stasch, Andreas, Forsyth, Craig M., Jones, Cameron, and Junk, Peter C. (2008) Thermally stable lead(II) amidinates and guanidinates. New Journal of Chemistry, 32 (5). pp. 829-834.

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The reactions of lithium amidinates and guanidinates [Li(Fiso)] (Fiso = N, N'-bis(2,6-diisopropylphenyl) formamidinate), [Li(Piso)] (Piso = N, N'-bis(2,6-diisopropylphenyl)( tert-butyl) amidinate), [Li(CyG)] (CyG = N, N ''-bis(2,6-diisopropylphenyl)-N', N'-dicyclohexylguanidinate) and [Li(HDG)] (HDG = N, N ''-bis(2,6-diisopropylphenyl)-N'-(2,6diisopropylphenyl) guanidinate) with anhydrous PbCl(2) in THF afforded the amidinate complexes [Pb(Fiso)(2)] 1, and [Pb(Piso)Cl](2) 2, and the guanidinate complexes [Pb(CyG)Cl](2) 3, and [Pb(HDG)Cl](2) 4 in moderate yields. The complexes are thermally stable, 2, 3 and 4 decompose between 163-202 degrees C whilst 1 melts with decomposition to lead metal at 310 degrees C. 2, 3 and 4 are unsymmetrical dimers in the solid state but their NMR data suggested fluxional behaviour in solution. Storing the yellow crystals of [Pb(CyG)Cl](2) 3 for one week in the perfluorinated crystallography oil under air resulted in oxygen incorporation into one isopropyl group of the CyG ligand giving a mixed amidinate-alkoxide dianion (CyGO) and afforded some new colourless crystals of [(CyGO) Pb](2) 5 that were characterised by a X-ray single crystal structure determination.

Item ID: 29629
Item Type: Article (Research - C1)
ISSN: 1369-9261
Keywords: x-ray-structure; complexes; chemistry; cyclopentadienyl; group-13; functionality; activation; reactivity; hydroxide; ligands
Date Deposited: 02 Oct 2013 10:34
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030204 Main Group Metal Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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