| 摘要 |
NEW MATERIAL:A compound expressed by formula I [either one of X and Y represents O(C2H4O)nR (R represents alkyl; n is 1-3) and the other represents H; A represents Va, Cu, Ni or Co]. EXAMPLE:A compound expressed by formula II. USE:An infrared ray-absorbing agent for agricultural films, etc., and optical recording media such as an optical disc, which has absorbance in near infrared region of around 750-900nm and superior weather as well as heat resistance and is soluble in various organic solvents. PREPARATION:For example, a naphthalene-2,3-dicarboxylic acid derivative expressed by formula III [example; 5-(((n-butoxy)ethoxy)ethoxy)ethoxy-2,3- naphthalenedicarboxylic anhydride, etc.] and a halide or oxide of vanadium, copper, nickel or cobalt are heated quinoline or chloronaphthalene as a solvent in the presence of urea at 200-250 deg.C for 1-5hr. |
