fig3

Figure 3. ²⁷Al MAS NMR spectra of the (A) Z12 and (B) [Ga,Al]Z12 samples and ⁷¹Ga MAS NMR spectra of the (C) [Ga,Al]Z12 and (D) GaZ12 samples. MAS: Magic angle spinning; NMR: nuclear magnetic resonance.