Polytertiary phosphines and arsines. VI. Some metal complexes of the mixed phosphine-diarsine bis(2-diphenylarsinoethyl)phenylphosphine

Abstract

The following metal complexes of the phosphine-diarsine [(C 6H 5) 2AsCH 2CH 2] 2PC 6H 5 (abbreviated as AsfPfAsf) 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 (AsfPfAsf)Fe(CO) (COCH 3)(C 5H 5); ( 2) Biligate monometallic (AsfPfAsf)M(CO) 4 (M = Cr and Mo) and [C 5H 5Mo(CO) 2(AsfPfAsf)][PF 6]; ( 3) Triligate monometallic [(AsfPfAsf)MCl][PF 6] (M = Pd and Pt), (AsfPfAsf)RhCl 3, (AsfPfAsf)M(CO) 3 (M = Cr and Mo), and (AsfPfAsf)Mn(CO) 2Br. Reaction of rhenium(III) chloride with AsfPfAsf in boiling acetonitrile gives brown (AsfPfAsf) 2Re 3Cl 9. Reaction of osmium tetroxide and hydrochloric acid with AsfPfAsf in boiling ethanol gives the yellow-orange osmium(III) derivative (AsfPfAsf)OsCl 3. Reaction of [Rh(CO) 2Cl] 2 with AsfPfAsf in boiling toluene gives brown sparingly soluble (AsfPfAsf)Rh 2(CO) 3Cl 2. Reaction of CH 3Mo(CO) 3C 5H 5 with AsfPfAsf in acetonitrile at room temperature gives yellow monoligate monometallic (AsfPfAsf)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 AsfPf) gives the yellow monometallic derivative (AsfPf)Mo(CO) 2(COCH 3(C 5H 5) rather than a biligate bimetallic derivative.