| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compound excellent in absorbing wave length characteristics and light fastness, and suitable as an optical element used as an optical recording material by using laser light. <P>SOLUTION: This cyanine compound is expressed by formula (I) [wherein, R<SP>1</SP>, R<SP>2</SP>are each independently H, hydroxy, a halogen atom or the like; R<SP>3</SP>, R<SP>4</SP>are each independently H, a 1-30C substituent such as an organic group or the like; R<SP>1</SP>to R<SP>4</SP>may form a ring structure by joining with each other; N-R<SP>3</SP>may form a heterocyclic ring by joining with a methylene group in an adjacent polymethylene chain with each other; X is O, S, Se or the like; Z<SP>o</SP>is a 1-10C organic group; (n) is 1 or 2; (r) is 2 to 8; A<SB>n</SB><SP>q-</SP>is a q-valent anion; (q) is 1 or 2; and (p) is a factor for keeping electric charge as neutral]. <P>COPYRIGHT: (C)2008,JPO&INPIT |
