Reactions of the Unsaturated Hydroxo Complex [W2Cp2(OH)(渭-PPh2)2(CO)]BF4 with Mono- and Bidentate Ligands Having E鈥揌 bonds (E = O, S, N)
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- 作者：Fernanda Cimadevilla ; M. Esther Garc铆a ; Daniel Garc铆a-Viv贸 ; Miguel A. Ruiz ; Claudia Graiff ; Antonio Tiripicchio
- 刊名：Inorganic Chemistry
- 出版年：2012
- 出版时间：October 1, 2012
- 年：2012
- 卷：51
- 期：19
- 页码：10427-10436
- 全文大小：409K
- 年卷期：v.51,no.19(October 1, 2012)
- ISSN：1520-510X
文摘
The title compound reacted with CO at room temperature in the presence of excess HBF4路OEt2 to yield a mixture of the electron-precise complexes [W2Cp2(渭-PPh2)2(CO)4](BF4)2 and [W2Cp2(渭-PPh2)2(CO)3(OH2)](BF4)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 H2O to give the 32-electron cations [W2Cp2(Z)(渭-PPh2)2(CO)]+ [Z = Br, SPh (W鈥揥 = 2.8076(9) 脜)], which were reversibly carbonylated to give the electron-precise derivatives [W2Cp2(渭-Z)(渭-PPh2)2(CO)2]+. Reaction with hydrogen sulfide likely proceeded analogously, but also involved fast cleavage of the second S鈥揌 bond to give the sulfido hydride cation [W2Cp2(渭-H)(渭-PPh2)2(S)(CO)]+. Deprotonation of the latter cation with 1,8-diazabicycloundec-7-ene (DBU) in the presence of excess H2S gave a mixture of the corresponding sulfido and disulfido complexes [W2Cp2(渭-PPh2)2(S)(CO)] and [W2Cp2(魏2-S2)(渭-PPh2)2(CO)]. Reactions of [W2Cp2(OH)(渭-PPh2)2(CO)]BF4 with several bidentate ligands (L2H) having weakly acidic H atoms (L2 = SC5H4N, SC6H4NH2, NHC(S)Ph) gave the unsaturated chelate derivatives [W2Cp2(魏2-L2)(渭-PPh2)2(CO)]BF4. The N鈥揌 bonds in the latter cations could be further deprotonated with strong bases (DBU or NaOH) to give neutral derivatives displaying either chelate (N,S-SC6H4NH) or imido-like terminal ligands (N-NC(S)Ph), respectively. The related chelate complex [W2Cp2(O,O鈥?/i>-OC6H4O)(渭-PPh2)2(CO)] (W鈥揥 = 2.836(1) 脜) was obtained in high yield from the reaction of the thiolato complex [W2Cp2(SPh)(渭-PPh2)2(CO)]BF4 with catechol in the presence of DBU.