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

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...

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Published in:Organometallics 1998-07, Vol.17 (15), p.3176-3181
Main Authors: Armstrong, David R, Beswick, Michael A, Cromhout, Natalie L, Harmer, Christopher N, Moncrieff, David, Russell, Christopher A, Raithby, Paul R, Steiner, Alexander, Wheatley, Andrew E. H, Wright, Dominic S
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cited_by cdi_FETCH-LOGICAL-a387t-427c4e4523636bfa47abc236c680c602d7e14156767c25ac98d6292daf126c1a3
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container_end_page 3181
container_issue 15
container_start_page 3176
container_title Organometallics
container_volume 17
creator Armstrong, David R
Beswick, Michael A
Cromhout, Natalie L
Harmer, Christopher N
Moncrieff, David
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Raithby, Paul R
Steiner, Alexander
Wheatley, Andrew E. H
Wright, Dominic S
description 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.
doi_str_mv 10.1021/om980077k
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title Weakly Bonded Lewis Base Adducts of Plumbocene and Stannocene:  A Synthetic and Calculational Study
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