PDFs of the MOF-CIGCs and their corresponding physical mixtures showed the same main correlations as their constituents, which confirms the structural integrity of each component (Fig. ). The first correlation located at 1.54 Å contains contributions from P-O, C-C and C-N. The second correlation at 2.07 Å is the Zn-N distance, characteristic of the ZnN4 coordination environment (Fig. and). The peak located at 2.46 Å may arise from a Na-O correlation, in agreement with the higher content of the glass. Zn•••CIm (C), Zn-NIm (E), Zn•••Zn (F) correlations are at 3.01, 4.08 and 6.05 Å, respectively. The increment of these areas is proportional with the proportion of ZIF-8 in the composite. Peaks at 3.46 and 4.63 Å may be related to P•••Na and Na•••Na, respectively and they are maintained independently of the amount of ZIF-8 in the composite.