With GaBA, the pyridine can deprotonate the silanol to generate an anionic [Ga(OSi)4] -core associated with pyridinium countercation (py/GaBA, Figure ). In this case, the calculated NMR parameters for py/GaBA δiso/CQ are 128 ppm/15 MHz, also illustrating a dramatic reduction in the magnitude of CQ and indicating a more symmetrical environment around Ga. Moreover, the CQ falls into the typical range for Ga tetrahedra in bulk structures, and is commensurate with values reported for [Ga(OSi)4] - tetrahedra, such as those found in Ga-Gehlenite (CQ > 13.5 MHz). While both GaLA and GaBA sites show a significant drop in CQ (40-60%), a comparatively small differences in δiso (Δδiso = 16 ppm) is observed. The change in CQ is significantly larger for GaBA than GaLA, indicating that both sites should be distinguishable upon adsorption of Py. shown in white, gray, blue, red, yellow, purple and pink, respectively.