[PtC=CR)4]2- as Double Alkynilation Reagents: Facile Formation of Binuclear bis(mu-alkynide) (M-Pt) and Ansymetrical Trinuclear Double bis(mu-alkynide) (M-Pt-Pt) Complexes

  1. Berenguer, J.R. 1
  2. Eguizábal, E. 1
  3. Falvello, L.R. 2
  4. Forniés, J. 2
  5. Lalinde, E. 1
  6. Martín, A. 2
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Instituto de Nanociencia y Materiales de Aragón
    info

    Instituto de Nanociencia y Materiales de Aragón

    Zaragoza, España

    ROR https://ror.org/031n2c920

Revue:
Organometallics

ISSN: 0276-7333

Année de publication: 2000

Volumen: 19

Número: 4

Pages: 490-496

Type: Article

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SCOPUS: 2-s2.0-0000676379 WoS: WOS:000085450800017 GOOGLE SCHOLAR

D'autres publications dans: Organometallics

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Résumé

Treatment of (NBu4)2[Pt(C≡CR)4]·2H2O (R = t-Bu, 1a; SiMe3, 1b; Ph, 1c) with 1 equiv of the dicationic solvento species [Cp*M(PEt3)(acetone)2](ClO4)2 (M = Rh, Ir) results in double alkynyl transfer to give the binuclear compounds [(PEt3)Cp*M(μ-1κCα:η 2-C≡CR)2Pt(C≡CR)2] (M = Rh, 2; Ir, 3), in which the organometallic unit "cis-Pt(C≡CR)2" is unusually stabilized by η2-bis(alkyne) interactions, as has also been confirmed for the related binuclear complex [(PPh3)Cp*Rh(μ-1κCα:η 2-C≡CSiMe3)2Pt(C≡CSiMe 3)2], 4b, which has been prepared analogously. These binuclear tetraalkynyl complexes can be used as precursors to unusual bis-(double-alkynide)-bridged trinuclear derivatives [(PEt3)Cp*M(μ-1κCα:η 2-C≡CR)2Pt(μ-2κCα: η2-C≡CR)2Pt(C6F5) 2] (M = Rh, 5; Ir, 6) by displacement reactions of thf from [cis-Pt(C6F5)2(thf)2]. An X-ray diffraction study confirms that in complex 5b (R = SiMe3) the mononuclear rhodium fragment "Cp*Rh(C≡CSiMe3)2(PEt3)" acts as a chelating bidentate ligand toward the alkynyl-bridged diplatinum organometallic unit Pt(μ-1κCα:η2-C≡CSiMe) 2-Pt(C6F5)2.