(Ge 2 P 2 ) 2- : a binary analogue of P 4 as a precursor to the ternary cluster anion [Cd 3 (Ge 3 P) 3 ] 3 .

The novel binary P ₄ analogue (Ge ₂ P ₂ ) ^2- proved to be a suitable precursor for heteroatomic cluster synthesis. Over time in solution, it rearranges to form (Ge ₇ P ₂ ) ^2- , as shown by NMR studies and X-ray diffraction. Reactions of (Ge ₂ P ₂ ) ^2- with CdPh ₂ afford [K(crypt-222)] ₃ [Cd ₃ (Ge ₃ P) ₃ ], containing an unprecedented ternary cluster anion with a triangular Cd ₃ moiety.