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The coordination complexes formed by transition metals with primary and secondary phosphines and arsines are being investigated ( R. G. Hayter ).

Particular interest is directed towards the condensation of these ligands with metal halides to form substituted phosphide or arside complexes.

During the past year, these ligands have yielded some unusual five-coordinate complexes of nickel ( 2 ) and some interesting binuclear phosphorus-bridged complexes of palladium ( 2 ) ( see figure ), as well as new compounds of the well-known type Af.

The structures, properties, and reactions of these compounds are being studied.