The complexes [(η5-C5R5)(CO)LM→Pt(C 6F5)2(CO)] (R = H or Me; M = Co or Rh; L = CO or PPh3) have been obtained by reacting the bases [M(η5-C5R5)(CO)L] with cis-[Pt(C6F5)2(CO)(thf)] (thf = tetrahydrofuran). Their structures are discussed on the basis of 1H, 19F, and 31P n.m.r. and i.r. data. The molecular structure of the complex [(η5-C5H5)(CO)2Rh→Pt(C 6F5)2(CO)] has been determined by an X-ray diffraction study: orthorhombic, space group P212121 with a = 7.632 1(10), b = 16.415 1(17), c = 16.520 0(43) Å, Z = 4; R = 0.027, R′ = 0.028 for 3 676 reflections with I ≥ 3σ(I) having 2 < 2θ < 60°. The structure shows that the basic (η5-C5H5)(CO)2Rh group is co-ordinated to the Pt(C6F5)2(CO) moiety forming a binuclear complex with an unbridged Rh-Pt bond of length 2.750(1) Å. Platinum is in an almost square-planar environment with the C6F5 groups mutually cis. The 19F n.m.r. spectra of the complexes reveal fluxional behaviour leading to equivalence of the two C6F5 groups. The reaction of [(η5-C5R5)(CO)2Rh→Pt(C 6F5)2(CO)] (R = H or Me) with PPh3 yields [Rh(η5-C5R5)(CO)2] and cis-[Pt(C6F5)2(CO)(PPh3)]; reacting [(η5-C5H5)(CO)2Rh→Pt(C 6F5)2(CO)] with bis(diphenylphosphino)methane (dppm) gives [Rh(η5-C5H5)(CO)2] and [Pt(C6F5)2(dppm)].
|Number of pages||5|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - 1988|
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