Abstract
The ligands L, bis(o-diphenylarsinophenyl)phenylarsine (ptas) and bis(o-diphenylarsinophenyl)phenylphosphine (pdap) form low-spin five-co-ordinate complexes of formulae [Ni2L3(H2O)](ClO4)4, [NiLX2](X = Br or I), and [CoLX2](X = Br or NCS). I.r. and visible spectra have been used in assigning square-pyramidal structures to the complexes. The complexing ability of these ligands is compared with that of similar ligands with aliphatic substituents on the arsenic atoms.
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