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Reactions of the Unsaturated Hydroxo Complex [W 2 Cp 2 (OH)(μ-PPh 2 ) 2 (CO)]BF 4 with Mono- and Bidentate Ligands Having E–H bonds (E = O, S, N)

2012; American Chemical Society; Volume: 51; Issue: 19 Linguagem: Inglês

10.1021/ic301674k

1520-510X

Fernanda Cimadevilla, M. Esther Garcı́a, Daniel Garcı́a-Vivó, Miguel A. Ruiz, Claudia Graiff, António Tiripicchio,

Inorganic Chemistry and Materials

The title compound reacted with CO at room temperature in the presence of excess HBF(4)·OEt(2) to yield a mixture of the electron-precise complexes [W(2)Cp(2)(μ-PPh(2))(2)(CO)(4)](BF(4))(2) and [W(2)Cp(2)(μ-PPh(2))(2)(CO)(3)(OH(2))](BF(4))(2), with the aquo ligand in the latter complex being easily displaced by simple donors such as acetonitrile. Reaction of the title complex with simple acidic molecules such as HSPh or HBr took place rapidly with elimination of H(2)O to give the 32-electron cations [W(2)Cp(2)(Z)(μ-PPh(2))(2)(CO)](+) [Z = Br, SPh (W-W = 2.8076(9) Å)], which were reversibly carbonylated to give the electron-precise derivatives [W(2)Cp(2)(μ-Z)(μ-PPh(2))(2)(CO)(2)](+). Reaction with hydrogen sulfide likely proceeded analogously, but also involved fast cleavage of the second S-H bond to give the sulfido hydride cation [W(2)Cp(2)(μ-H)(μ-PPh(2))(2)(S)(CO)](+). Deprotonation of the latter cation with 1,8-diazabicycloundec-7-ene (DBU) in the presence of excess H(2)S gave a mixture of the corresponding sulfido and disulfido complexes [W(2)Cp(2)(μ-PPh(2))(2)(S)(CO)] and [W(2)Cp(2)(κ(2)-S(2))(μ-PPh(2))(2)(CO)]. Reactions of [W(2)Cp(2)(OH)(μ-PPh(2))(2)(CO)]BF(4) with several bidentate ligands (L(2)H) having weakly acidic H atoms (L(2) = SC(5)H(4)N, SC(6)H(4)NH(2), NHC(S)Ph) gave the unsaturated chelate derivatives [W(2)Cp(2)(κ(2)-L(2))(μ-PPh(2))(2)(CO)]BF(4). The N-H bonds in the latter cations could be further deprotonated with strong bases (DBU or NaOH) to give neutral derivatives displaying either chelate (N,S-SC(6)H(4)NH) or imido-like terminal ligands (N-NC(S)Ph), respectively. The related chelate complex [W(2)Cp(2)(O,O'-OC(6)H(4)O)(μ-PPh(2))(2)(CO)] (W-W = 2.836(1) Å) was obtained in high yield from the reaction of the thiolato complex [W(2)Cp(2)(SPh)(μ-PPh(2))(2)(CO)]BF(4) with catechol in the presence of DBU.