Infrared absorbent
AssigneeFuji Photo Film Co., Ltd.
InventorsYoshiaki Suzuki, Gouichi Hayashi
Life of this patent
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Abstract
An infrared absorbent comprising a metal complex compound prepared by coordinating a thiorato bidentate ligand and a nitrogen-containing bindentate ligand to a center metal. With use of the infrared absorbent, there is provided an infrared absorbing material capable of absorbing a far-infrared or near-infrared light having a wavelength of 700 nm or more, which has a high transmittance of a visible light and a good fastness to heat and light. The infrared absorbing material can be used for an infrared absorbing material such as an optical filter or other various objects.
Claims19
A compound represented by the formula:
- ##STR3## wherein M represents nickel, palladium or platinum;
- R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8, which may be the same or different from one another, each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an alkoxycarbonyl group, or a substituted or unsubstituted phenyl group;
- each pair of R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, R.sup.3 and R.sup.4, R.sup.4 and R.sup.5, R.sup.5 and R.sup.6, R.sup.6 and R.sup.7, and R.sup.7 and R.sup.8 may be bonded to each other to form a ring;
- and R.sup.9, R.sup.10, R.sup.11 and R.sup.12 each represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted amino group, which may be the same or different from one another.
Dependencies are inferred from the claim text.