Phthalocyanine compound and synthesis method and use thereof

A synthesis method for a phthalocyanine compound consisting of a structure as represented by Formula I below,

• wherein A represents a transition metal or a rare earth metal, and R1 represents a phenyl group, a naphthyl group, or a C4-C16 n-alkyl group, wherein the synthesis method comprises the steps of:
• (1) reacting o-xylene with liquid bromine to produce a compound II of 4,5-dibromo-o-xylene;
• (2) producing a compound III of 4,5-dibromo-o-phthalic acid from 4,5-dibromo-o-xylene under the action of potassium permanganate;
• (3) reacting 4,5-dibromo-o-phthalic acid with R1Br in the presence of potassium hydroxide and a catalyst of tetraoctylammonium bromide to produce a compound IV;
• (4) reacting the compound IV with cuprous cyanide to produce a compound V;
• and
• (5) mixing and reacting the compound V with bis(diiminoisoindoline) and A(CH3COO)2 to produce a phthalocyanine compound consisting of a structure as represented by Formula I.