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New pyridyl modified phosphines: Synthesis and late transition-metal coordination studies

New pyridyl modified phosphines: Synthesis and late transition-metal coordination studies
New pyridyl modified phosphines: Synthesis and late transition-metal coordination studies
Using a phosphorus based Mannich condensation reaction the new pyridylphosphines {5-Ph2PCH2N(H)}C5H3(1-Cl) and {2-Ph2PCH2N(H)}C5H3(5-Br)N (1-Br) have been synthesised in good yields (60% and 88%, respectively) from Ph2PCH2OH and the appropriate aminopyridine. The ligands 1-Cl and 1-Br display variable coordination modes depending on the choice of late transition-metal complex used. Hence P-monodentate coordination has been observed for the mononuclear complexes AuCl(1-Cl) (2), AuCl(1-Br) (3), RuCl2(p-cymene)(1-Cl) (4), RuCl2(p-cymene)(1-Br) (5), RhCl2(Cp*)(1-Cl) (6), RhCl2(Cp*)(1-Br) (7), IrCl2(Cp*)(1-Cl) (8), IrCl2(Cp*)(1'-Cl) (8'), IrCl2(Cp*)(1-Br) (9), cis-/trans-PdCl2(1-Cl)(2) (10), cis-/trans-PdCl2(1-Br)(2) (11), cis-PtO2(1-Cl)(2) (12) and cis-PtCl2(1-Br)(2) (13). Reaction of Pd(Me)Cl(cod) (cod = cycloocta-1,5-diene) with either 1 equiv. of 1-Br or the known pyridylphosphines 1'-Cl, 1-OH or 1-H gave the P/N-chelate complexes Pd(Me)Cl(1-Br-1-H) (14)-(17). All new compounds have been fully characterised by spectroscopic and analytical methods. Furthermore the structures of 4, 5, 10 and 16 center dot (CH3)(2)SO have been elucidated by single crystal X-ray crystallography. A crystal structure of the dinuclear metallocycle trans, trans-[PdCl2{ mu-P/N-{Ph2PCH2N(H)} C5H4N}(2) center dot CHCl3, 18 center dot CHCl3, has also been determined. Here 1-H bridges, using both P and pyridyl N donors, two dichloropalladium centres affording a 12-membered ring with the PdCl2 units adopting a head-to-tail arrangement.
phosphines, transition-metals, x-ray crystallography, multinuclear nmr, chelate complexes, bridging ligands py = 2-pyridyl, structural-characterization, catalytic oligomerization, palladium(ii) complexes, condensation-reactions, tertiary phosphines, crystal-structures, nickel-complexes, ligands, chemistry
0020-1693
2980-2988
Durran, S.E.
53f07743-9dfe-46bb-92f6-fda1c644a36d
Smith, M.B.
23b83856-56c6-49db-9409-6d6a2b2b5938
Dale, S.H.
fbad2456-6cc7-4cec-8386-6671e0756f6a
Coles, S.J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Hursthouse, M.B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Light, M.E.
cf57314e-6856-491b-a8d2-2dffc452e161
Durran, S.E.
53f07743-9dfe-46bb-92f6-fda1c644a36d
Smith, M.B.
23b83856-56c6-49db-9409-6d6a2b2b5938
Dale, S.H.
fbad2456-6cc7-4cec-8386-6671e0756f6a
Coles, S.J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Hursthouse, M.B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Light, M.E.
cf57314e-6856-491b-a8d2-2dffc452e161

Durran, S.E., Smith, M.B., Dale, S.H., Coles, S.J., Hursthouse, M.B. and Light, M.E. (2006) New pyridyl modified phosphines: Synthesis and late transition-metal coordination studies. Inorganica Chimica Acta, 359 (9), 2980-2988. (doi:10.1016/j.ica.2005.12.068).

Record type: Article

Abstract

Using a phosphorus based Mannich condensation reaction the new pyridylphosphines {5-Ph2PCH2N(H)}C5H3(1-Cl) and {2-Ph2PCH2N(H)}C5H3(5-Br)N (1-Br) have been synthesised in good yields (60% and 88%, respectively) from Ph2PCH2OH and the appropriate aminopyridine. The ligands 1-Cl and 1-Br display variable coordination modes depending on the choice of late transition-metal complex used. Hence P-monodentate coordination has been observed for the mononuclear complexes AuCl(1-Cl) (2), AuCl(1-Br) (3), RuCl2(p-cymene)(1-Cl) (4), RuCl2(p-cymene)(1-Br) (5), RhCl2(Cp*)(1-Cl) (6), RhCl2(Cp*)(1-Br) (7), IrCl2(Cp*)(1-Cl) (8), IrCl2(Cp*)(1'-Cl) (8'), IrCl2(Cp*)(1-Br) (9), cis-/trans-PdCl2(1-Cl)(2) (10), cis-/trans-PdCl2(1-Br)(2) (11), cis-PtO2(1-Cl)(2) (12) and cis-PtCl2(1-Br)(2) (13). Reaction of Pd(Me)Cl(cod) (cod = cycloocta-1,5-diene) with either 1 equiv. of 1-Br or the known pyridylphosphines 1'-Cl, 1-OH or 1-H gave the P/N-chelate complexes Pd(Me)Cl(1-Br-1-H) (14)-(17). All new compounds have been fully characterised by spectroscopic and analytical methods. Furthermore the structures of 4, 5, 10 and 16 center dot (CH3)(2)SO have been elucidated by single crystal X-ray crystallography. A crystal structure of the dinuclear metallocycle trans, trans-[PdCl2{ mu-P/N-{Ph2PCH2N(H)} C5H4N}(2) center dot CHCl3, 18 center dot CHCl3, has also been determined. Here 1-H bridges, using both P and pyridyl N donors, two dichloropalladium centres affording a 12-membered ring with the PdCl2 units adopting a head-to-tail arrangement.

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More information

Published date: 2006
Keywords: phosphines, transition-metals, x-ray crystallography, multinuclear nmr, chelate complexes, bridging ligands py = 2-pyridyl, structural-characterization, catalytic oligomerization, palladium(ii) complexes, condensation-reactions, tertiary phosphines, crystal-structures, nickel-complexes, ligands, chemistry

Identifiers

Local EPrints ID: 44427
URI: http://eprints.soton.ac.uk/id/eprint/44427
ISSN: 0020-1693
PURE UUID: b416d2f6-a6d1-431c-ac20-9a116a301a51
ORCID for S.J. Coles: ORCID iD orcid.org/0000-0001-8414-9272
ORCID for M.E. Light: ORCID iD orcid.org/0000-0002-0585-0843

Catalogue record

Date deposited: 01 Mar 2007
Last modified: 16 Mar 2024 03:05

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Contributors

Author: S.E. Durran
Author: M.B. Smith
Author: S.H. Dale
Author: S.J. Coles ORCID iD
Author: M.B. Hursthouse
Author: M.E. Light ORCID iD

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