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AssigneeFuji Photo Film Co., Ltd.
InventorsYoshiaki Suzuki, Gouichi Hayashi
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The present invention relates to a metal complex compound useful in an infrared absorbent prepared by coordinating two bidentate ligands of the following formula (iii): ##STR1## wherein R.sup.1 and R.sup.2 each independently represents a hydrogen atom, a cyano group, or a substituted or unsubstituted alkyl, aryl or heterocyclic group, which may be the same or different. The present invention is further directed to an infrared absorbing composition comprising a metal complex compound prepared by coordinating two bidentate ligands of formula (iii) above to a center metal and neutralizing a complex ion with a cation. The present invention is also directed to an infrared absorbing article which comprises a metal complex compound prepared by coordinating two bidentate ligands of formula (iii) above to a center metal and neutralizing such a complex with a phosphonium cation.
A metal complex compound useful as an infrared absorbent prepared by coordinating two bidentate ligands of the following formula (iii) to a center metal selected from the group consisting of nickel, copper, cobalt, palladium and platinum and neutralizing such a complex with a phosphonium cation ##STR174## wherein, R.sup.1 and R.sup.2 each independently represents a hydrogen atom, cyano group, or a substituted or unsubstituted alkyl, aryl or heterocyclic group, which may be the same or different.
An infrared absorbent composition which comprises at least two metal complex compounds represented by the following general formula (IV) ##STR177## wherein R.sup.1 and R.sup.2 each independently represents a hydrogen atom, cyano group or a substituted or unsubstituted alkyl, aryl or heterocyclic group, which may be the same or different;
An infrared absorbing article which comprises a metal complex compound prepared by coordinating two bidentate ligands of the following formula (iii) to a center metal selected from the group consisting of nickel, copper, cobalt, palladium and platinum and neutralizing such a complex with a phosphonium cation ##STR179## wherein, R.sup.1 and R.sup.2 each independently represents a hydrogen atom, cyano group, or a substituted or unsubstituted alkyl, aryl or heterocyclic group, which may be the same or different.
An infrared absorbing composition comprising a metal complex compound prepared by coordinating two bidentate ligands of the following formula (iii) to a center metal selected from the group consisting of nickel, copper, cobalt, palladium and platinum and neutralizing such a complex with a phosphonium cation ##STR180## wherein, R.sup.1 and R.sup.2 each independently represent a hydrogen atom, cyano group, or a substituted or unsubstituted alkyl, aryl or heterocyclic group, which may be the same or different, and a binder.
Dependencies are inferred from the claim text.