After our recent successful synthesis of the mono-uranium EMF species U@D_3h-C₇₄, U@C₂(5)-C₈₂, U@C_2v(9)-C₈₂, and U@C₁(11)-C₈₆ when using the gasses O₂, SO₂, and CO₂ have been studied, the role of nitrogen source in accelerating the generation of mono-uranium EMFs possessing non-IPR cages will be discussed. Different nitrogen sources (such as N₂ or NH₃) have been used to produce these species (Figure 1). Besides the IPR species, the most abundant non-IPR species produced by N₂ was U@C₈₀, followed by U@C₇₆. In addition, mono-uranium EMF U@C₉₄ was obtained with the help of NH₃ as well as U₂N@C₇₈. The extremely short retention time of U@C₉₄ on Buckeyprep column indicates the possibility of a non-IPR C₉₄ cage. The detailed synthesis, separation and structure characterizations will be presented and discussed.