The GM and LM1 of Pt7 are spin triplets, while LM2 is a spin singlet. with electron transfer from Pt to the carbon atoms of ethylene, the similar Pt charge distributions in Pt7Ge2 and Pt7Ge2C2 suggests that their ethylene binding energies should also be similar, consistent with the observation that C2D4 desorption changed only slightly over the TPD sequence for the PtnGem/alumina samples (Fig. ).