Patent ID: 8420847

Claim:
A bis-phosphate compound comprising a tetraaryl skeleton of formula (1): wherein: R 1 to R 14 are each independently a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, a hydroxyl group, an optionally substituted alkoxy group, an optionally substituted aryloxy group, an optionally substituted acyl group, an optionally substituted alkoxycarbonyl group, an optionally substituted aryloxycarbonyl group, an optionally substituted carbamoyl group, an optionally substituted alkylthiocarbonyl group, an optionally substituted arylthiocarbonyl group, a carboxyl group, an optionally substituted alkylthio group, an optionally substituted arylthio group, an optionally substituted amino group, a substituted silyl group, or a halogen atom; in any combination of R 1 to R 14 , these substituents may be linked together to form a ring; X 1 to X 14 are each independently a carbon atom or a nitrogen atom, wherein in the case of a nitrogen atom, there is no substituent on the nitrogen atom; A 1 to A 6 are each independently an oxygen atom or a sulfur atom; and the —OH group in the phosphate moiety may form a metal salt, an ammonium salt, or an amine salt.