| abstract |
An optical recording material containing a compound of formula (I): n n n n n n n n n n wherein R 1 and R 2 each represent hydrogen, hydroxyl, halogen, nitro, cyano, a C1-C30 organic group, or a group of formulae (II), (II′) or (III); or R 1 and R 12 are connected to form a ring; X 1 is —CR 3 R 4 — or —NH—; Y 1 is a C1-C30 organic group or a substituent of formulae (II), (II′) or (III); R 3 and R 4 each represent hydrogen, a C1-C30 organic group, or a group of formulae (II), (II′) or (III), provided that, when Y 1 is a group of formula (III), R 3 is hydrogen, a C1-C30 organic group, or a group of formulae (II), (II′) or (III), and when Y 1 is a C1-C30 organic group or a group of formulae (II) or (II′), R 3 is a group of formulae (II), (II′) or (III); M is Fe, Co, Ni, Ti, Cu, Zn, Zr, Cr, Mo, Os, Mn, Ru, Sn, Pd, Rh, Pt, or Ir; An q− is a q-valent anion, p is a number necessary to neutralize an electric charge; and q is 1 or 2. |