Cyanine compound and optical recording material
US8206806B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2007 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Sep 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2495
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cyanine compound is represented by formula (I):A1: benzene or naphthalene ring. A3: 5- or 6-membered ring. R1, R2: hydrogen atom and the like. R7: an alkyl group and the like. R12: a substituent by formula (II) or (II′). R20: a hydrogen atom and the like. Anq-: a q-valent anion. q: 1 or 2; p: a coefficient for neutral charge. In formula (II): bond between L and T is a double, conjugated double, or triple bond. L: carbon atom. T: carbon, oxygen, sulfur, or nitrogen atom. x, y, z: 0 or 1. s: 0-4. R13: hydrogen atom and the like. R14, R15, and R16: hydrogen atom and the like. In formula (II′), the bond between L′ and T′ is a double or conjugated double bond. L′: carbon atom. T′:carbon, oxygen, nitrogen atom. s′: 0-4. Ring containing L′ and T′: 5-membered ring, may contain a heteroatom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.