Abstract
The following metal complexes of the phosphine-diarsine [(C 6H 5) 2AsCH 2CH 2] 2PC 6H 5 (abbreviated as AsfPfAsf) can be prepared by procedures analogous to the preparation of the corresponding complexes of the the triphosphine [(C 6H 5) 2PCH 2CH 2] 2PC 6H 5: ( 1) Monoligate monometallic (AsfPfAsf)Fe(CO) (COCH 3)(C 5H 5); ( 2) Biligate monometallic (AsfPfAsf)M(CO) 4 (M = Cr and Mo) and [C 5H 5Mo(CO) 2(AsfPfAsf)][PF 6]; ( 3) Triligate monometallic [(AsfPfAsf)MCl][PF 6] (M = Pd and Pt), (AsfPfAsf)RhCl 3, (AsfPfAsf)M(CO) 3 (M = Cr and Mo), and (AsfPfAsf)Mn(CO) 2Br. Reaction of rhenium(III) chloride with AsfPfAsf in boiling acetonitrile gives brown (AsfPfAsf) 2Re 3Cl 9. Reaction of osmium tetroxide and hydrochloric acid with AsfPfAsf in boiling ethanol gives the yellow-orange osmium(III) derivative (AsfPfAsf)OsCl 3. Reaction of [Rh(CO) 2Cl] 2 with AsfPfAsf in boiling toluene gives brown sparingly soluble (AsfPfAsf)Rh 2(CO) 3Cl 2. Reaction of CH 3Mo(CO) 3C 5H 5 with AsfPfAsf in acetonitrile at room temperature gives yellow monoligate monometallic (AsfPfAsf)Mo(CO) 2(COCH 3)(C 5H 5) rather than a triligate trimetallic derivative. Similarly the reaction of CH 3Mo(CO) 3C 5H 5 with the phosphine-arsine (C 6H 5) 2AsCH 2CH 2P(C 6H 5) 2 (abbreviated as AsfPf) gives the yellow monometallic derivative (AsfPf)Mo(CO) 2(COCH 3(C 5H 5) rather than a biligate bimetallic derivative.
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