In this paper, we report the synthesis, purification, C-13 NMR, and other characterization studies of Y3N@C-88. The C-13 NMR, UV-vis, and chromatographic data suggest an Y3N@C-88 having an IPR-allowed cage with D-2(35)-C-88 symmetry. In earlier density functional theory (DFT) computational and X-ray crystallographic studies, it was reported that lanthanide (A(3)N)(6+) clusters are stabilized in D-2(35)-C-88 symmetry cages and have reduced HOMO-LUMO gaps relative to other trimetallic nitride endohedral metallofullerene cage systems, for example, A(3)N@C-80. In this paper, we report that the nonlanthanide (Y3N)(6+) cluster in the D-2(35)-C-88 cage exhibits a HOMO-LUMO gap consistent with other lanthanide A(3)N@C-88 molecules based on electrochemical measurements and DFT computational studies. These results suggest that the reduced HOMO-LUMO gap of A(3)N@C-88 systems is a property dominated by the D-2(35)-C-88 carbon cage and not f-orbital lanthanide electronic metal cluster (A(3)N)(6+) orbital participation.