Interactions of weakly coordinating anions with tripalladium sandwich complexes

Dominic C. Babbini; Hannah R. Schulhauser; Frank R. Kramer; Gary S. Nichol; Stephanie K. Hurst

doi:10.1016/j.jorganchem.2011.06.022

Interactions of weakly coordinating anions with tripalladium sandwich complexes

Dominic C. Babbini, Hannah R. Schulhauser, Frank R. Kramer, Gary S. Nichol, Stephanie K. Hurst

Chemistry and Biochemistry

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

An understanding of the interaction of weakly coordinating ligands with zero-valent palladium complexes is of importance to understanding the potential catalytic mechanisms and properties of these complexes. We have used a combination of multi-nuclei NMR, microanalysis and single crystal X-ray diffraction to characterize a series of tripalladium ditropylium sandwich complexes that possess one or more triflate [CF ₃SO ₃] ^- ligands. The influence of the strong electronic effects on the triflate ligand cause a significant change in the internal bond lengths and angles of the complexes which are coupled to systematic shifts of the tropylium ¹H and ¹³C resonances in the NMR spectra. The use of the Advanced Light Source (ALS) permitted crystallographic characterization of only the third example of a complex containing a Pd-FBF ₃ bond.

Original language	English (US)
Pages (from-to)	3143-3149
Number of pages	7
Journal	Journal of Organometallic Chemistry
Volume	696
Issue number	20
DOIs	https://doi.org/10.1016/j.jorganchem.2011.06.022
State	Published - Oct 1 2011

Keywords

Tetrafluoroborate
Triflate
Tripalladium
Tropylium

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jorganchem.2011.06.022

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title = "Interactions of weakly coordinating anions with tripalladium sandwich complexes",

abstract = "An understanding of the interaction of weakly coordinating ligands with zero-valent palladium complexes is of importance to understanding the potential catalytic mechanisms and properties of these complexes. We have used a combination of multi-nuclei NMR, microanalysis and single crystal X-ray diffraction to characterize a series of tripalladium ditropylium sandwich complexes that possess one or more triflate [CF 3SO 3] - ligands. The influence of the strong electronic effects on the triflate ligand cause a significant change in the internal bond lengths and angles of the complexes which are coupled to systematic shifts of the tropylium 1H and 13C resonances in the NMR spectra. The use of the Advanced Light Source (ALS) permitted crystallographic characterization of only the third example of a complex containing a Pd-FBF 3 bond.",

keywords = "Tetrafluoroborate, Triflate, Tripalladium, Tropylium",

author = "Babbini, {Dominic C.} and Schulhauser, {Hannah R.} and Kramer, {Frank R.} and Nichol, {Gary S.} and Hurst, {Stephanie K.}",

note = "Funding Information: We thank Northern Arizona University and the College of Engineering, Forestry and Natural Sciences for start up funding. The X-ray diffractometer for 4 was purchased with funds from NSF grant CHE-9610374 . Crystallographic data for 1 , 3 & 5 were collected at Beamline 11.3.1 at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory. The ALS is supported by the U.S. Department of Energy, Office of Energy Sciences, under Contract DE-AC02-05CH11231. We thank Drs Jeanette Krause and Allen Oliver for data collection of 1 through the SCrALS (Service Crystallography at Advanced Light Source) program. We thank the Research Corporation for Science Advancement for their support through the Cottrell College Science Award (ID 10600). ",

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AU - Schulhauser, Hannah R.

AU - Kramer, Frank R.

AU - Nichol, Gary S.

AU - Hurst, Stephanie K.

N1 - Funding Information: We thank Northern Arizona University and the College of Engineering, Forestry and Natural Sciences for start up funding. The X-ray diffractometer for 4 was purchased with funds from NSF grant CHE-9610374 . Crystallographic data for 1 , 3 & 5 were collected at Beamline 11.3.1 at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory. The ALS is supported by the U.S. Department of Energy, Office of Energy Sciences, under Contract DE-AC02-05CH11231. We thank Drs Jeanette Krause and Allen Oliver for data collection of 1 through the SCrALS (Service Crystallography at Advanced Light Source) program. We thank the Research Corporation for Science Advancement for their support through the Cottrell College Science Award (ID 10600).

PY - 2011/10/1

Y1 - 2011/10/1

N2 - An understanding of the interaction of weakly coordinating ligands with zero-valent palladium complexes is of importance to understanding the potential catalytic mechanisms and properties of these complexes. We have used a combination of multi-nuclei NMR, microanalysis and single crystal X-ray diffraction to characterize a series of tripalladium ditropylium sandwich complexes that possess one or more triflate [CF 3SO 3] - ligands. The influence of the strong electronic effects on the triflate ligand cause a significant change in the internal bond lengths and angles of the complexes which are coupled to systematic shifts of the tropylium 1H and 13C resonances in the NMR spectra. The use of the Advanced Light Source (ALS) permitted crystallographic characterization of only the third example of a complex containing a Pd-FBF 3 bond.

AB - An understanding of the interaction of weakly coordinating ligands with zero-valent palladium complexes is of importance to understanding the potential catalytic mechanisms and properties of these complexes. We have used a combination of multi-nuclei NMR, microanalysis and single crystal X-ray diffraction to characterize a series of tripalladium ditropylium sandwich complexes that possess one or more triflate [CF 3SO 3] - ligands. The influence of the strong electronic effects on the triflate ligand cause a significant change in the internal bond lengths and angles of the complexes which are coupled to systematic shifts of the tropylium 1H and 13C resonances in the NMR spectra. The use of the Advanced Light Source (ALS) permitted crystallographic characterization of only the third example of a complex containing a Pd-FBF 3 bond.

KW - Tetrafluoroborate

KW - Triflate

KW - Tripalladium

KW - Tropylium

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Interactions of weakly coordinating anions with tripalladium sandwich complexes

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