Production method of (1,2-diaryl-1,2-ethylene-dithio Lato) nickel-based complex bis

摘要

PURPOSE:To obtain the subject compound capable of absorbing near infrared rays in high yield by reacting a specific benzil compound with phosphorus pentasulfide in dimethylimidazolidinone and subsequently reacting the resultant compound with nickel chloride using a low toxic, thermally and chemically stable solvent. CONSTITUTION:A benzil compound expressed by formula I (R1 and R2 are phenyl or naphthyl which may be substituted or form a ring) is made to react with phosphorus pentasulfide in 1,3-dimehyl-2-imidazolidinone and subsequently allowed to react with nickel chloride to afford the objective compound expressed by formulas II and/or III. The resultant compound is useful as a near infrared ray cutting filter for electronic devices, photographic near infrared ray filter, safety goggles, sunglasses, goggles, heat ray cutting off film, agricultural film, optical disk, recording material for optical letter reading, solar heat storage, photographic sensitive material, etc.