Cyanine compound and optical recording materials

Abstract

The cyanine compound of the present invention is represented by general formula (I) below and shows decomposition behavior suitable as an optical recording material used for an optical recording layer of an optical recording medium for high-speed recording: (wherein in formula, ring A and ring B each represent an optionally substituted benzene or naphthalene ring; X represents O, S, Se, CR 3 R 4 , or NY; at least one of R 1 and R 2 represents a group represented by general formula (II) or (III) and when only one of them is a group represented by general formula (II) or (III), the other represents an organic group having 1 to 30 carbon atoms; R 3 and R 4 each represents an organic group having 1 to 30 carbon atoms; Y represents a hydrogen atom or an organic group having 1 to 30 carbon atoms; at least one of Y 1 and Y 2 is a group represented by general formula (IV) and when only one of Y 1 and Y 2 is a group represented by general formula (IV), the other represents a hydrogen atom or an organic group having 1 to 30 carbon atoms; Z represents a hydrogen atom, a halogen atom, or a cyano group; An m- represents an m-valent anion; m is an integer of 1 or 2; and p represents a coefficient to keep an electric charge neutral). Cyanine compounds represented by the general formula (I) which exhibit decomposition behavior suitable for the optical recording material to be used in optical recording layers of optical recording media for high-speed recording: (I) wherein A and B are each an optionally substituted benzene or naphthalene ring; X is O, S, Se, CR C09B 23 / 00 G11B 7 / 244 B41M 5 / 26 C07D 209 / 60 1 16 2 2005 / 9 / 21 101035867 2007 / 9 / 12 000000000 Adeka Corp. Japan Shigeno Koichi Yano Toru chenjian quan yaohui 72002 NTD Patent & Trademark Agency Ltd. Units 1805-6, 18th Floor, Greenfield Tower, Concordia Plaza, No.1 Science Museum Road, Tsimshatsui, east, Kowloon, Hong Kong 100045 Japan 2004 / 10 / 7 295111 / 2004 2007 / 4 / 6 PCT / JP2005 / 017375 2005 / 9 / 21 WO2006 / 038464 2006 / 4 / 13 Japanese

Description

technical field [0001] The present invention relates to a novel cyanine compound and an optical recording medium containing the cyanine compound. The cyanine compound can be used not only in optical recording materials but also in light-absorbing materials for optical filters of image display devices. Background technique [0002] Compounds with high intensity absorption in the range of 550-620 nm, especially compounds with maximum absorption (λmax) at 550-620 nm, are used as optical recording materials to form optical recording layers of optical recording media such as DVD-R. [0003] As the above-mentioned optical recording materials, cyanine compounds having an indole ring have the advantages of high sensitivity and ability to cope with high-speed recording, and many examples have been reported. For example, in Patent Documents 1 and 2, it is reported that a low-temperature decomposable cyanine compound containing a metallocene group is introduced on the N side chain, an...

AI Technical Summary

Problems solved by technology

For example, a cyanine compound using perchlorate anion, which is effective in low-temperature decomposing properties, may degrade the jitter performance of an optical recording medium due to the large heat generation during decomposition.

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