Some Platinum(II) Complexes Containing bis(diphenylphosphino)acetylene PPh2C=CPPh2: Synthesis, Characterisation and Crystal Structures.

  1. Falvello, L.R. 1
  2. Forniés, J. 1
  3. Gómez, J. 2
  4. Lalinde, E. 2
  5. Martín, A. 1
  6. Martínez, F. 1
  7. Moreno, M.T. 2
  1. 1 Instituto de Nanociencia y Materiales de Aragón
    info

    Instituto de Nanociencia y Materiales de Aragón

    Zaragoza, España

    ROR https://ror.org/031n2c920

  2. 2 Universidad de la Rioja, Spain
Revue:
Journal of the Chemical Society-Dalton Transactions

ISSN: 0300-9246

Année de publication: 2001

Volumen: 14

Pages: 2132-2140

Type: Article

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SCOPUS: 2-s2.0-0034742938 WoS: WOS:000169786900013 GOOGLE SCHOLAR

D'autres publications dans: Journal of the Chemical Society-Dalton Transactions

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Résumé

The reactivity of cis-[Pt(C≡CR)2(COD)] (R = But, Ph) and cis/trans-[Pt(C6F5)2(tht)2] towards PPh2C≡CPPh2 (dppa) in several molar ratios has been explored. Treatment of cis-[Pt(C≡CR)2(COD)] with 1 equiv. of dppa leads to novel alkynyl Pt(II) dimers [Pt2(C≡CR)4(μ-dppa)2] (R = But 1, Ph 2) with a double dppa-bridged system. However, the reactions with 2 equiv. of dppa only give mixtures of 1 or 2 and the expected cis-[Pt(C≡CR)2(dppa- κP)2] (R = But 3, Ph 4). The analogous reactions using cis- or trans-[Pt(C6F5)2(tht)2] (tht = tetrahydrothiophene) as precursors afford, in 1 : 1 molar ratio, the homologous pentafluorophenyl-bis(μ-dppa) diplatinum species [Pt2(C6F5)4(μ-dppa) 2] 5 or the polymer trans-[Pt(C6F5)2(μ-dppa)]n 7 and, in 1 : 2 molar ratio, the mononuclear cis- or trans-[Pt(C6F5)2(dppa-κ P)2] (6,8) derivatives. The molecular structure of 5 has been confirmed by X-ray diffraction. Furthermore, [Pt2(C≡CR)4-(μ-dppa)2] 1 and 2 react with 2 equiv. of cis-[Pt(C6F5)2(thf)2] to afford the tetranuclear bis(μ-alkynyl)bis(μ-dppa) platinum complexes [(C6F5)2Pt(μ-C≡CR)2Pt( μ-dppa)]2 (R = But 9, Ph 10). However, a mixture of 9/10 and [(RC≡C)2Pt(μ-dppa)2Pt(μ-C≡CR) 2Pt(C6F5)2] (R = But 11, Ph 12) is observed if the reactions are carried out in 1 : 1 molar ratios. Finally, dinuclear P-bonded mono μ-dppa complexes of type Q2[cis-{Pt(C6F5)2X}2 (μ-dppa)] [Q = NBu4, X = C6F5 13, X = Cl 14; Q = PMePh3, X = C≡CPh 15 (X-ray)] have also been prepared starting from the appropriate precursors and dppa.