By reaction of white phosphorus with the tripod tritertiary phosphine $CH_{3}C(CH_{2}PPh_{2})_{3}$, triphos, and cobalt(II) and nickel(II) aquo-cations triple-decker sandwich complexes of the general formula $\left[ (triphos)M-\mu-(\eta-P_{3})M(tripos) \right]^{+,2+}$ are obtained. They contain the cyclo-triphosphorus group as an internal slice. The number of valence electrons ranges from 31 to 34.