| abstract |
NEW MATERIAL:A 1,2-naphthalocyanine derivative represented by formula I, wherein the naphthalene rings A, B, C and D may be each substituted by 1-6 substituted or unsubstituted alkyls, alkoxys, alkylthios, alkylaminos, dialkylaminos, aryls, aryloxys, arylthios, arylaminos or halogen atoms; and Met is two hydrogen atoms, a bivalent metal atom, a monosubsituted trivalent metal atom, a disubstituted tetravalent metal atom or an oxymetal atom. n USE: This material is a near-infrared absorber having an absorption at a near- infrared region of 700-850nm, is excellent in light resistance, weathering resistance, heat resistance, etc., and can be used as a material for an optical recording medium, a near-infrared absorption filter, etc. n PREPARATION: One to four compounds of formula II or III are reacted together by heating in butanol in the presence of 1,8-diazabicyclo[5,4,0]-7-undecene to obtain a compound of formula I. n COPYRIGHT: (C)1990,JPO&Japio |