Synthesis and Characterization of New Triangulo Derivatives of PtIPtIPtII, Including the First Platinum Cluster Binding Both Ethylene and CO
详细信息 查看全文
- 作者：Piero Leoni ; Fabio Marchetti ; Marco Pasquali ; Lorella Marchetti ; and Alberto Albinati
- 刊名：Organometallics
- 出版年：2002
- 出版时间：May 27, 2002
- 年：2002
- 卷：21
- 期：11
- 页码：2176 - 2182
- 全文大小：116K
- 年卷期：v.21,no.11(May 27, 2002)
- ISSN：1520-6041
文摘
The terminal hydride in the PtIPtIPtII triangulo cluster Pt3(
-PBut2)3(H)(CO)2 (1) may beremoved by one-electron oxidants such as [Cp2Fe]PF6. Under carbon monoxide the reactionaffords the symmetrical, cationic derivative [Pt3(-PBut2)3(CO)3]PF6 (2). By operating withan excess of the suitable ligand, we also prepared [Pt3(-PBut2)3(CO)2(NCCH3)]PF6 (3) and[Pt3(-PBut2)3(CO)2(CH2=CH2)]PF6 (4). New neutral triangular precursors were obtained bysubstitution of the CO ligands contained in 1 with isocyanides. The hydrides Pt3(-PBut2)3(H)(CNR)2 (5, R = CH2Ph; 6, R = C6H4-p-CH3; 7, R = But) were isolated by this route. Complex7 reacts with chloroform to give Pt3(-PBut2)3(Cl)(CNBut)2 (8), which, under an excess ofCNBut, yields the cationic derivative [Pt3(-PBut2)3(CNBut)3]Cl (9). The new triangulo clusterswere characterized by multinuclear NMR spectroscopy and, as far as 4 and 7 are concerned,by single-crystal X-ray diffraction.
-PBut2)3(H)(CO)2 (1) may beremoved by one-electron oxidants such as [Cp2Fe]PF6. Under carbon monoxide the reactionaffords the symmetrical, cationic derivative [Pt3(-PBut2)3(CO)3]PF6 (2). By operating withan excess of the suitable ligand, we also prepared [Pt3(-PBut2)3(CO)2(NCCH3)]PF6 (3) and[Pt3(-PBut2)3(CO)2(CH2=CH2)]PF6 (4). New neutral triangular precursors were obtained bysubstitution of the CO ligands contained in 1 with isocyanides. The hydrides Pt3(-PBut2)3(H)(CNR)2 (5, R = CH2Ph; 6, R = C6H4-p-CH3; 7, R = But) were isolated by this route. Complex7 reacts with chloroform to give Pt3(-PBut2)3(Cl)(CNBut)2 (8), which, under an excess ofCNBut, yields the cationic derivative [Pt3(-PBut2)3(CNBut)3]Cl (9). The new triangulo clusterswere characterized by multinuclear NMR spectroscopy and, as far as 4 and 7 are concerned,by single-crystal X-ray diffraction.