Patent ID: 7767808

Claim:
A compound represented by the following Formula (A-2): where R 1 , R 2 , and R 3 may be the same or different, and each represents a hydrogen atom or an alkyl or alkyloxy group; M 1 and M 2 , may be the same or different, M 1 represents two protons or a first bivalent or trivalent metal ion, M 2 represents a second bivalent or trivalent metal ion, and each of the first bivalent or trivalent metal ion and the second bivalent or trivalent metal ion is formed from an atom of an element selected from the group consisting of Mg, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, Fe, Ru, Os Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, and Au; X 1 represents a single bond or an alkylene group; X represents —O—, —S—, >NR 101 (where R 101 represents H or alkyl group), CH 2 , or a single bond; Y represents 2H, ═O or ═S; m is an integer of 0 to 4; and Z represents a five- or six-membered nitrogen-containing coordinating heteroaromatic ring group, provided that multiple substituent groups represented by the same character may be the same or different.