Weakly Bonded Lewis Base Adducts of Plumbocene and Stannocene: A Synthetic and Calculational Study

Autor:	and Andrew E. H. Wheatley, Paul R. Raithby, Alexander Steiner, Christopher A. Russell, Christopher N. Harmer, Natalie L. Cromhout, David R. Armstrong, David Moncrieff, Michael A. Beswick, Dominic S. Wright
Rok vydání:	1998
Předmět:	Denticity Chemistry Stereochemistry Ligand Organic Chemistry Ab initio Adduct Inorganic Chemistry Metal Crystallography visual_art visual_art.visual_art_medium Lewis acids and bases Physical and Theoretical Chemistry Lone pair Group 2 organometallic chemistry
Zdroj:	Organometallics. 17:3176-3181
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om980077k
Popis:	The coordination of [(η-Cp)2Pb] and [(η-Cp)2Sn] by bidentate Lewis-base ligands gives the first examples of adducts of neutral p-block metallocenes. Ab initio MO calculations of [(η-Cp)2Pb·TMEDA] (1) (TMEDA = (Me2NCH2)2), [Cp2Pb·4,4‘-Me2bipy] (2) (4,4‘-Me2bipy = 4,4‘-dimethylbipyridine), and the new complex [(η-Cp)2Sn·TMEDA] (3) confirm that despite the presence of longer Pb−N and Sn−N bonds in the solid-state structures of the TMEDA adducts, the association of TMEDA with the metallocenes is more favorable than with 4,4‘-Me2bipy. This finding is a consequence of the greater reorganization energy of 4,4‘-Me2bipy compared to TMEDA. The low association energies of these species can be rationalized in terms of metal lone pair/ligand lone pair repulsion.
Databáze:	OpenAIRE
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