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Title: Reactions of [(µ-H) Os3(CO)8- {Ph2PCH2P(Ph)C6H4}] and [Os3(CO)10 (µ-dppm)] with 2-mercaptoimidozole, 2-mercaptobenzimidazole and 2-mercaptobenzothiazole: X-ray structure of [(µ-H)Os3(CO)8(µ-dppm)(µ-η1-SN2C3H3)]
Authors: Begum, Noorjahan
Hassan, Md Manjur
Hossain, G M Golzar
Kabir, Shariff E
Issue Date: Apr-2005
Publisher: NISCAIR-CSIR, India
IPC Code: Int. C17, C07F 15/00
Abstract: The electron-deficient compound [(µ-H)Os3(CO)8-{Ph2PCH2P(Ph)C6H4}] 2 reacts with 2-mercaptoimidozole, 2- mercaptobenzimidazole and 2-mercaptobenzothiazole at 80°C to give [(µ-H)Os3(CO)8(µ-dppm)(µ-η1-SN2C3H3)] 3, [(µ-H)Os3(CO)8(µ-dppm)(µ-η1-SN2C7H5)] 4 and [(µ-H)Os3(CO) 8(µ-dppm)(µ-η1-SN2C7H5)] 5 in 30, 50 and 59% yields, respectively. The compounds are formed by the oxidative addition of S-H bond followed by demetallation of the phenyl ring of the orthometallated dppm ligand. Compounds 3-5 have also been obtained from the reactions of [Os3(CO)10(µ-dppm)] 1 with 2- mercaptoimidozole, 2-mercaptobenzimidazole and 2- mercaptobenzothiazole, respectively at 110ºC but in some what lower yields. The compounds have been characterized by elemental analysis, IR, IH NMR and 31p{1H} NMR spectroscopic data together with single crystal X-ray diffraction studies for 3. Compound 3 crystallizes in the triclinic space group PI with a=11.3453(12), b=13.651(2), c=15.069(2) Å, α=84.709(l1), b=72.7C6(9), γ=68.265(9)º, Z=2 and V=2069.5(4) Å3. The structure consists of an equilateral triangle of osmium atoms with a bridging dppm, a bridging hydride and a bridging 2- mercaptoimidazolato ligand.
Page(s): 723-728
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.44A(04) [April 2005]

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