Phthalocyanine compounds, process for producing the same, and near infrared absorbent comprising the same

摘要

The invention relates to a novel phthalocyanine compound which absorbs in a near-infrared region of 700~1000 nm with little absorption in the visible region of the spectrum and can be applied with advantage to a near-infrared light-absorbing filter for plasma display, a secret ink and other applications and to a process for producing the phthalocyanine compound.The above phthalocyanine compound has the following general formula (I). A near-infrared light-absorbing material containing the same is also provided.wherein R1~R8 represents alkyl or alkoxyalkyl; X1~X8 represents sulfur or >NR9; X1=(either X3 or X4)=(either X5 or X6)=(either X7 or X8)=sulfur and X2=(the other one of X3 and X4)=(the other one of X5 and X6)=(the other one of X7 and X8)=>NR9; R9 represents an acyl group which may optionally be substituted or an aroyl group which may optionally be substituted; M represents a couple of hydrogen atoms, a divalent metal, a trivalent metal derivative or a tetravalent metal derivative).