and extended the solvent knitting methods for PPh3 through the application of DCE as sole external crosslinker (VI). The successful incorporation of phosphine units in P-DCE, P-FDA and P-DCM is proven by the detection of phosphorus in x-ray fluorescence spectroscopy (XRF) (Table ). FTIR (Fig. ) reveals the C-P vibrations (1435 cm -1 ) of the phosphine units, also P=O vibration bands (1176 cm -1 ) appear in all of the three polyphosphines, resulting from oxidation processes during the synthesis. The characteristic vibration modes of the aromatic rings