Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides

Pieper M, Lamm J-H, Neumann B, Stammler H-G, Mitzel NW (2017)
DALTON TRANSACTIONS 46(16): 5326-5336.

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Abstract
New geminally bonded intramolecular donor-acceptor systems, Cp(2)LnCH(2)PR(2) (Ln = Y, Ho, Er, R = CHMe2, CMe3), were prepared by salt elimination reactions between the dicyclopentadienyl-element chlorides (Cp(2)LnCl, Ln = Y, Ho, Er) and diorganylphosphinomethanides (R2PCH2Li; R = CHMe2, CMe3). These compounds, 1-6, were characterized by elemental analyses, mass spectrometry and X-ray diffraction experiments and the yttrium species additionally by NMR spectroscopy. In the solid state the molecular structures differ from each other, depending on the steric demand of the phosphorus substituents. For all iso-Pr-substituted compounds, dimers [Cp(2)LnCH(2)P(CHMe2)(2)](2) with six-membered Ln-C-P-LnC- P rings in a chair-like conformation were observed. The sterically more demanding tert-butyl groups prevent dimerization but instead lead to species that undergo complexation of LiCl units by two monomers: [Cp(2)LnCH(2)P(CMe3)(2 center dot)LiCl]. The solution NMR data for the yttrium compounds are consistent with the solid-state structures. Conversion with phenylacetylene afforded heteroleptic cyclobutane-like alkynyl-rare-earth metal complexes [Cp(2)Ln(mu-CuCPh)](2) [Ln = Y (7), Ho (8), Er (9)]. Treatment of compounds 1-6 with 1,8-diethynylanthracene led to single metalation and dimerization and products with similar structural motifs as observed for complexes 7-9. Reactions with dihydrogen and carbon dioxide resulted in Y-C bond breaking, yielding Cp2YH/R2PCH3 and CO2 insertion products, respectively.
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Pieper M, Lamm J-H, Neumann B, Stammler H-G, Mitzel NW. Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides. DALTON TRANSACTIONS. 2017;46(16):5326-5336.
Pieper, M., Lamm, J. - H., Neumann, B., Stammler, H. - G., & Mitzel, N. W. (2017). Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides. DALTON TRANSACTIONS, 46(16), 5326-5336. doi:10.1039/c7dt00554g
Pieper, M., Lamm, J. - H., Neumann, B., Stammler, H. - G., and Mitzel, N. W. (2017). Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides. DALTON TRANSACTIONS 46, 5326-5336.
Pieper, M., et al., 2017. Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides. DALTON TRANSACTIONS, 46(16), p 5326-5336.
M. Pieper, et al., “Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides”, DALTON TRANSACTIONS, vol. 46, 2017, pp. 5326-5336.
Pieper, M., Lamm, J.-H., Neumann, B., Stammler, H.-G., Mitzel, N.W.: Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides. DALTON TRANSACTIONS. 46, 5326-5336 (2017).
Pieper, Martin, Lamm, Jan-Hendrik, Neumann, Beate, Stammler, Hans-Georg, and Mitzel, Norbert W. “Methylene-bridged, intramolecular donor-acceptor systems based on rare-earth metals and phosphinomethanides”. DALTON TRANSACTIONS 46.16 (2017): 5326-5336.
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