Phosphines polydentate phosphine complexes

Zerovalent complexes are also obtained with polydentate phosphines [53] Pd2Cl2(dppm)2 NaBH > Pd2(dppm)3... 

Complexes are similarly formed by polydentate phosphine and arsine ligands synthetic routes involve oxidation of the platinum(II) complex, either with the halogen or with nitric acid ... 

IV. Molybdenum Dinitrogen Complexes with Polydentate Phosphine... 

Zirconium and hafnium tetrahalides form six-, seven- and eight-coordinate adducts with polydentate phosphine and arsine ligands. The 1 1 adducts [MXt(dppe)] and [MX dpae)] (M = Zr, X = C1 or Br M = Hf, X = C1 dppe = Ph2PCH2CH2PPh2, dpae = Ph2AsCH2CH2AsPh2) have been prepared in benzene media. IR spectra of the [MCLt(dppe)] complexes exhibit four v(M—Cl) modes in the 353-278 cm-1 region, consistent with a six-coordinate octahedral structure.45... 

Binuclear complexes with polydentate phosphine bridges 414... 

The use of polydentate phosphines has received a renewed interest, with the search for new families of polyhydrides or molecular dihydrogen complexes see Dihydrogen Complexes Related Sigma Complexes). For example, PP3RUCI2... 

Polydentate phosphines continue to attract much interest, especially in the complexes they form, and also in the catalytic applications displayed by some compounds.214-216 To differentiate this class from that of Section 1.12.2.7 on bidentate tertiary phosphines, polyphosphines are compounds possessing three or more phosphorus donor atoms. Most synthetic routes are similar to those outlined before,50,216 so only a selection of polydentate phosphines will be given here including a brief summary, where appropriate, of their syntheses and key reactions. 

The variation in electronic and steric effects in PR3 and related ligands can significantly alter the reactivities of complexes in a series in which the only variant is the phosphine ligand. Many polydentate phosphines are known,... 

---