1-THF, illustrating the parallels between the molecular analogs and the surface species, and demonstrating that it is difficult to distinguish both sites solely from their Ga NMR parameters. We next explored the influence of the distance between the Ga centre and adjacent neutral donor ligand for both GaLA and GaBA to establish how the neutral donor affects δiso and CQ (Figure , SI S6). In both cases the general trend is the same -the shortening of the Ga-O bond distance results in an increase δiso, alongside a decrease in CQ -aligning well with earlier observations regarding the role of neutral donors within the molecular series.