摘要 |
To provide a near-IR absorption compound free from antimony or arsenic and excellent in stability, especially, in heat resistance, light fastness, and moisture-and-heat resistance and also an IR absorption filter, an optical information recording medium, and a resin composition excellent in durability by using the near-IR absorption compound. The near-IR absorption compound is a diimmonium compound having the following structure and the resin composition contains the diimmonium compound: (wherein R<SUB>1 </SUB>to R<SUB>8 </SUB>independently denote hydrogen atom or an optionally substituted aliphatic hydrocarbon group; R<SUB>9 </SUB>and R<SUB>10 </SUB>independently denote an aliphatic hydrocarbon group optionally containing a halogen atom; and rings A and B may further have substituent groups.).
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