| 摘要 |
<p>Provided is a complex compound which is composed of a compound represented by formula (I), a metal and at least one kind of ion that is selected from the group consisting of ions obtained by adding one or more protons to amines, ammonium ion and quaternary ammonium ions, and which is used in an optical recording medium that has excellent recording/reproducing characteristics and the like. (In the formula, R1, R2, R3 and R4 may be the same or different and each represents a hydrogen atom, an optionally substituted amino group, an optionally substituted alkoxyl group or the like; R5 represents a hydrogen atom or the like; and ring A represents an optionally substituted heterocyclic ring that is selected from the group consisting of a tetrazole ring and the like.)</p> |
