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The triethylphosphine (L) complexes, PdL4 and PtL4, were prepared in high yield by reaction of the metal dichlorides, triethylphosphine, and potassium metal in tetrahydrofuran. The palladium complex was also obtained by thermal decomposition of Pd(CH3)zLz in excess triethylphosphine. Vacuum thermolysis of NiL4 and PdL4 gave NiL3 and PdL3, respectively. Protonation of ML4 by ethanol gave HML3+ complexes which were isolated as the tetraphenylborate salts. The nickel hydride salts [HViL'4] [B(c6Hs)4] (L' = P(CH3)3 and P ( C H~) Z ( C~H~) ) were prepared from bis( 1,5-~ycIooctadiene)nickel(O), L', and NaB(C6H5)4 in ethanol. PdL3 reacted with C6HsCN to give Pd(CN)(C6Hs)Lz and with CH3I to give PdI(CH3)L2; PdL4 reacted with C6HsBr to give PdBr(C6H5)Lz.

Zeise's salt is obtained as well-formed, yellow, needle-shaped crystals. The compound is stable in the solid state at room temperature and decomposes with loss of ethylene at about 1 8OoC. The chemical, physical, and structural properties have been characterized thoroughly and are described in the l i t e r a t~r e .~'~

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