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1.The COOH-containing GO (500mg) were reacted with a large excess of SOCl2 containing a catalytic amount of DMF under reflux for 24 h. The residual thionyl
chloride and solvent were removed by distillation.
2.To a suspension of GO¨CCOCl (50mg) in anhydrous DMF (70mL) was added to PcZn (60mg) and Et3N (15mL) under purified nitrogen. The reaction mixture was sonicated 1 h at 40 C first and then refluxed at 130 C for 3 days. It should be noted that light must be strictly excluded during this step in order to avoid possible photodegradation of phthalocyanine.
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