According to P-PPh3 (VPore = 0.28 mL g -1 ), P-Xantphos (VPore = 0.18 mL g -1 ) and P-BINAP (VPore = 0.11 mL g -1 ) exhibit a micro-and mesoporosity, which can be attributed to the formation of rigid interconnected frameworks (Fig. ). In contrast, P-dppm, P-dppe and P-dppp show no significant nitrogen uptake, which is related to the absence of porous structures in the dried state.