Tricarbonyl(cyclopentadienyl)(selenotriphenylphosphonium)tungsten(I) Perchlorate, [W(C₅H₅)(C₁₈H₁₅PSe)(CO)₃](ClO₄)

The P-Se bond length of 2.194 (1) Å indicates selenophosphonium character, rather than that of a triphenylphosphine selenide complex. The W atom displays `piano-stool' coordination with a W-Se bond length of 2.658 (1) Å.

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