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Title: Synthesis, structure and reactivity of triosmium clusters derived from the reactions of [Os3(CO)10(µ-dppm)] and [(µ-H)Os3(CO)8{µ3-Ph2PCH2P(Ph)C6H4}] with tris(4-fluorophenyl)phosphine and tris(cyanoethyl)phosphine
Authors: Miah, Abdur R
Rajbangshi, Subas
Hossain, Kamal
Siddiquee, Tasneem A
Kabir, Shariff E
Keywords: Organometallic compounds;Triosmium clusters;Phosphines;Substitution reaction;Orthometalation;X-ray structures
Issue Date: May-2015
Publisher: NISCAIR-CSIR, India
Abstract: The reactions of [Os3(CO)10(µ-dppm)] (1) with tris(4-fluorophenyl)phosphine, P(4-FC6H4)3, and tris(cyanoethyl) phosphine, P(CH2CH2CN)3, in the presence of Me3NO in refluxing dichloromethane give the mono-substituted clusters [Os3(CO)9(µ-dppm){P(4-FC6H4)3)}] (2) and [Os3(CO)9(µ-dppm){P(CH2CH2CN)3)}] (3), respectively, in which the phosphine is bound to the non-dppm-substituted osmium center. The 46-electron compound [(µ-H)Os3(CO)8- 3-Ph2PCH2P(Ph)C6H4}] (6) reacts with an excess of P(4-FC6H4)3 and P(CH2CH2CN)3 at ambient temperature to yield (2) and (3), respectively. Heating (2) or (3) in refluxing toluene at 110 oC afforded the electron-deficient clusters [(µ-H)- Os3(CO)73-Ph2PCH2PPh(C6H4)}{P(4-FC6H4)3)}] (4) and [(µ-H)Os3(CO)73-Ph2PCH2PPh(C6H4)}{P(CH2CH2CN)3}] (5) resulting from C-H bond scission of the coordinated dppm and metal hydride bond formation. The molecular structures of (2), (3) and (4) have been determined by single- crystal X-ray diffraction studies.
Page(s): 581-587
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(05) [May 2015]

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