Patent ID: 8304536

Claim:
A compound, represented by the formula (1) [wherein M represents a hydrogen atom, or a central metal selected from Li, Be, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Ba, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Ti, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, Pa, U, Np and Am, Z 1 and Z 2 independently represent a hydroxyl group, an alkoxy group having 1 to 18 carbon atoms, or a phenyl group, and Ar represents at least one aryl group selected from the formulas (2) to (12) (in the formulas (2) to (12), R 1 to R 103 independently represent a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a silanol group, a thiol group, a carboxyl group, a phosphoric group, a phosphoric ester group, an ester group, a thioester, an amide group, a nitro group, a monovalent hydrocarbon group, an organooxy group, an organoamino group, an organosilyl group, an organothio group, an acyl group or a sulfone group)].