Diphenylphosphido bridging ligands

Dinuclear complexes containing pyrazolate and diphenylphosphido bridging ligands were prepared by reacting [ Rh(C5Me< ) 2(ju-pz )(/i-OMe)2](BF4) with HPPh2 (Table IX) (130, 131). 

A dinickel(I) compound 17 was made from the reaction between metallacyclic Ni(n) carboxylate ( nickelalactone ) and bis(diphenylphosphino)methane (dppm) (Scheme 10.7) [11]. The Ni(I)-Ni(I) bond length in 17 is 2.563(1) A (Entry 4, Table 10.2), and features three different bridging ligands (dppm, carboxylate, diphenylphosphido). The formation of 17 was proposed to proceed via the mechanism depicted in Scheme 10.8, and is remarkable because it acts as a model for the key step in the formation of acrylic acid from COj and ethylene. 

The three Pt(II) atoms have a square planar configuration and are each coordinated through bridging diphenylphosphido ligands, without any metal-metal bonding interaction. 

Ir(PPh2)2(CO)2(PPh3)2] 0.032 contains bridging diphenylphosphido ligands. The Ir—Ir distance (2.551 A) suggests a strong bond d... 

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