Trinuclear osmium clusters containing bidentate Ph2PCH2PPh2 and Me2PCH2PMe2 ligands: X-ray crystal structures of the complexes [Os3H(CO)9(Me2PCHPMe2)] and [Os3H(OH)(CO)8(Ph2PCH2PPh2)]

摘要: The clusters [Os3(CO)10(dppm)](dppm = Ph2PCH2PPh2) and [Os3(CO)10(dmpm)](dmpm Me2PCH2PMe2) react with trimethylamine N-oxide in acetonitrile solution to give [Os3 CO)9-(dppm)(MeCN)](1) [Os3(CO)9(dmpm)(MeCN)](2) respectively. ligand of (1) (2) is readily displaced by other two-electron donor ligands [Os3(CO)9(dppm)L][L PPh3, P(OMe)3, or ButNC] [Os3(CO)9(dmpm)L][L P(OMe)3 C2H4]. Thermolysis [Os3(CO)9(dmpm)(C2H4)] [Os3(CO)10(dmpm)] gives the cyclometallated product [Os3H (CO)9-(Me2PCHPMe2)]. complex also reacts HX (X Cl SR, R alkyl) general formula [Os3H(X)(CO)8(dppm)], whereas for X OH OMe only isolated [Os3H(CO)8{Ph2PCH2PPh(C6H4)}]. dmpm derivative similarly HCl RSH. cluster [Os3H(OH)(CO)8(dppm)], which can be prepared from [Os2H-(OH)(CO)10] dppm, was found have a different structure [Os3H(Cl)(CO)8(dppm)]. All products were characterised i.r. n.m.r. spectroscopy. structures [Os3H(CO)9-(Me2PCHPMe2)] [Os3H(OH)(CO)8(dppm)] confirmed X-ray crystallography.