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  Structural Properties and Dynamics of Five-Coordinate Nickel(II)−π-Allyl Complexes Containing Monodentate Phosphorus Ligands

Rufińska, A., Goddard, R., Weidenthaler, C., Bühl, M., & Pörschke, K.-R. (2006). Structural Properties and Dynamics of Five-Coordinate Nickel(II)−π-Allyl Complexes Containing Monodentate Phosphorus Ligands. Organometallics, 25(9), 2308-2330. doi:10.1021/om0601807.

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Rufińska, Anna1, Author              
Goddard, Richard2, Author              
Weidenthaler, Claudia3, Author              
Bühl, Michael4, Author              
Pörschke, Klaus-Richard5, Author              
Affiliations:
1Service Department Mynott (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445627              
2Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
4Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445590              
5Research Group Pörschke, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445616              

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 Abstract: The novel ionic pentacoordinate NiII−π-allyl complexes [(η3-C3H5)Ni(PMe3)3]Y (1a−d) and [(η3-C3H5)Ni{P(OMe)3}3]Y (2a−d) (Y = SO3CF3 (a), PF6 (b), Br (c), I (d)) have been synthesized and investigated by DSC, solid-state NMR, and X-ray single-crystal and powder diffractometry. Apart from 1a, all complexes are polymorphic. The PMe3 complexes 1b−d undergo monoclinic-monoclinic phase transitions. The solid-state structures of 1a and 1b-II are rigid at low temperature but fluxional at ambient temperature, whereas those of 1c-II and 1d-II are almost rigid, while somewhat faster dynamics occur for 1c-I and 1d-I. Similarly, the structures of 2c-II and 2d-II are fully or almost fully rigid at ambient temperature. The properties of the P(OMe)3-ligated OTf and PF6 salts 2a,b are completely different. 2a crystallizes in the triclinic phase 2a-II, which transforms at −21 °C into the highly mobile, plastically crystalline mesophase 2a-I with a cubic primitive cell. 2b crystallizes from solution in the monoclinic phase 2b-III, having a rigid structure, and transforms at ambient temperature reversibly into the similarly crystalline phase 2b-II, which undergoes slow dynamics. Heating either phase to 53 °C gives rise to the plastically crystalline mesophase 2b-I. For complexes 1a−d (all phases) and the phases 2a-II and 2b-II the solid-state dynamics start with turnstile rotation of the three phosphorus ligands. For the mesophases 2a-I and 2b-I additional π-allyl ligand mobility has been established and anion mobility must also be assumed. DFT MO calculations on the cations 1 and 2 and the parent PH3 complex 3 gave low rotational barriers of up to 3.5 kcal/mol in the gas phase. Complexes 2a,b are rare examples of metallorganic plastic crystals (dynamically disordered mesophases).

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Language(s): eng - English
 Dates: 2006-02-232006-03-302006-04-01
 Publication Status: Published in print
 Pages: 23
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/om0601807
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Title: Organometallics
  Abbreviation : Organometallics
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 25 (9) Sequence Number: - Start / End Page: 2308 - 2330 Identifier: ISSN: 0276-7333
CoNE: https://pure.mpg.de/cone/journals/resource/954925505259