Synthesis of pyridyl imine functionalized PDMS (PDMS-L). PDMS-L is synthesized following a previously published procedure with slight modification. Aminopropyl terminated polydimethylsiloxane (50g, 0.03mol, the molecular weight is estimated from Fourier-transform infrared (FTIR) spectroscopy. The IR spectra of the materials are collected by a Bruker Vertex V80V Vacuum FTIR system under the attenuated total reflection (ATR) configuration. The spectral range of 4000 cm -1 to 600 cm -1 are collected.