Abstract
The synthesis, physicochemical properties, X-ray powder structure, electrochemical, and oxygen-sensing properties of a new phenoxy-substituted lithium phthalocyanine (lithium 1,8,15,22-tetraphenoxyphthalocyanine, LiPc-α-OPh) radical probe are presented. LiPc-α-OPh was synthesized in the form of a microcrystalline powder by an elctrochemical method and characterized by UV−visible, IR, 1H NMR, EPR, and mass spectroscopy. The UV−visible spectrum of LiPc-α-OPh showed a bathochromic shift of absorption bands due to delocalization of the π- electron density into the phenoxy ring. X-ray powder diffraction studies revealed a structural framework that possesses long, hollow channels running parallel to the packing direction. The channels measured approximately 4.9 × 8.7 A2 in the two-dimensional plane perpendicular to the length of the channel, allowing for diffusion of oxygen molecules (2.9 × 3.9 A2) through the channel. The powder exhibited a single, sharp EPR line under anoxic conditions, with a peak-to-peak li...
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