Complementary to direct NMR studies, cross polarisation (CP) NMR measurements were also performed. Comparison of direct and CP measurements reveals a decrease in the relative intensity of Q 3 signal with respect to the Q 2 major peak in the CP spectra. A systematic increase in the intensity of the -10.7 ppm signal in the CP spectra relative to direct NMR spectra was also observed for the blend samples (Table ). This can be attributed to the proximity to protons in the imidazolate ligands of the agZIF-62 inducing an increase of the intensity in the CP spectra by polarisation transfer between P nuclei in the phosphate glass and 1 H nuclei in the imidazolate rings.