Near-infrared absorbing composition, near-infrared absorbing film, and image sensor for solid-state imaging element

A near-infrared absorbing composition, comprising:

• a near-infrared absorbing agent;
• and a solvent,
• wherein the near-infrared absorbing agent comprises at least one of the following Component (A) and Component (B):
• Component (A):
• a component composed of a compound having a structure of the following general formula (I) and a metal ion;
• and
• Component (B):
• a component composed of a metal complex that is a reaction product of the compound having the structure of the following general formula (I) and a metal compound,
• in the general formula (I), R is an alkyl group of 1 to 20 carbons or an aryl group of 6 to 20 carbons, in which R may have a substituent, and z is a structural unit selected from the following formulae (Z-1) to (Z-3),
• the asterisk in the formulae (Z-1) to (Z-3) represents a bonding site that is bonded to O of the general formula (I),
• R21 to R24 each is a hydrogen atom or an alkyl group of 1 to 4 carbons,
• the compound having the structure of the general formula (I) concurrently has at least one moiety satisfying the following Condition (i) and at least one moiety satisfying the following Condition (ii):
• Condition (i):
• R21 to R24 are all hydrogen atoms;
• Condition (ii):
• at least one of R21 to R24 is an alkyl group of 1 to 4 carbons,
• in the general formula (I), l is a number of the moiety satisfying the Condition (i) and is from 1 to 10, and m is a number of the moiety satisfying the Condition (ii) and is from 1 to 10, and
• the composition further comprises a phosphonic acid compound having the following structure:
• wherein R1 is a branched, linear or cyclic alkyl, alkenyl, alkynyl, aryl or aryl group of 1 to 30 carbons, and at least one hydrogen atom of R1 is optionally substituted with a halogen atom, an oxyalkyl, polyoxyalkyl, oxyaryl, oxyaryl, polyoxyaryl, acyl, aldehyde, carboxyl or hydroxyl group, or a group having an aromatic ring.