Table 2. ²⁷Al NMR Parameters of Ga_5–xAl_xO₇(OH) Obtained from the MQMAS Spectra Shown in Figure S4 (and the corresponding projections shown in Figure 4d).

	Ga4.5Al0.5O7OH		Ga4.0Al1.0O7OH		Ga3.5Al1.5O7OH
	⟨δiso⟩ (ppm)	⟨PQ⟩ (MHz)	⟨δiso⟩ (ppm)	⟨PQ⟩ (MHz)	⟨δiso⟩ (ppm)	⟨PQ⟩ (MHz)
signal I	21(1)	4.6(2)	21(1)	4.7(2)	20(1)	5.1(2)
signal II	20(1)	3.5(2)	19(1)	3.8(2)	18(1)	3.8(2)
signal III	11(1)	2.2(2)	11(1)	2.1(2)	11(1)	2.1(2)