Polycyclic aromatic compound

A compound or a salt thereof represented by any one of the following formulas (III′-1) to (XIV′-1A):

• wherein
• X represents B, P, P═O, P═S, P═Se, As, As═O, As═S, As═Se, Sb, Sb═O, Sb═S, Sb═Se, an optionally substituted metal in groups 3 to 11 in the periodic table, or an optionally substituted metal or metalloid in group 13 or 14 of the periodic table;
• R represents a hydrogen atom, halogen atom, C1-20 alkyl group, hydroxy C1-20 alkyl group, trifluoromethyl group, C2-12 perfluoroalkyl group, C3-8 cycloalkyl group, C2-20 alkenyl group, C2-20 alkynyl group, mono- or di-aryl-substituted alkenyl group, mono- or di-heteroaryl-substituted alkenyl group, arylethynyl group, heteroarylethynyl group, hydroxy group, C1-20 alkoxy group, aryloxy group, trifluoromethoxy group, trifluoroethoxy group, C2-12 perfluoroalkoxy group, C1-20 alkylcarbonyl group, C1-20 alkylsulfonyl group, cyano group, nitro group, amino group, monoalkylamino group, monoarylamino group, monoheteroarylamino group, carbazole group, C1-20 alkoxycarbonylamino group, carbamoyl group, mono- or di-alkylcarbamoyl group, sulfamoyl group, mono- or di-alkylsulfamoyl group, C1-20 alkylsulfonylamino group, C1-20 alkylcarbonylamino group, aryl group, heteroaryl group, C1-20 alkoxycarbonyl group, carboxyl group, 5-tetrazolyl group, sulfo group (—SO2OH), fluorosulfonyl group, SRa, N(Ra)2, B(Ra)2, Si(Ra)3, or —C≡C—Si(Ra)3
• (wherein Ra represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted heteroaryl group;
• or two Ras, together with an atom bound thereto, may form a bicyclic group or a tricyclic group optionally having a heteroatom);
• provided that, the alkyl group, the alkenyl group, the alkynyl group, and the alkoxy group are each optionally substituted with 1 to 3 atoms or groups, selected from the group consisting of halogen atom, hydroxy group, C1-20 alkoxy group, aryloxy group, amino group, carbazole group, N(Ra)2 (wherein Ra is as defined above), trifluoromethyl group, C2-12 perfluoroalkyl group, C3-8 cycloalkyl group, aryl group, and heteroaryl group;
• and the aryl group, aryl moiety, heteroaryl group, heteroaryl moiety, and carbazole group are each optionally substituted with 1 to 5 atoms or groups, selected from the group consisting of halogen atom, C1-20 alkyl group, hydroxy C1-20 alkyl group, trifluoromethyl group, C2-12 perfluoroalkyl group, C3-8 cycloalkyl group, C2-20 alkenyl group, C2-20 alkynyl group, mono- or di-aryl-substituted alkenyl group, mono- or di-heteroaryl-substituted alkenyl group, arylethynyl group, heteroarylethynyl group, hydroxy group, C1-20 alkoxy group, aryloxy group, trifluoromethoxy group, trifluoroethoxy group, C2-12 perfluoroalkoxy group, cyano group, nitro group, amino group, carbazole group, monoalkylamino group, monoarylamino group, monoheteroarylamino group, N(Ra)2
• (wherein Ra is as defined above), carbamoyl group, mono- or di-alkylcarbamoyl group, sulfamoyl group, mono- or di-alkylsulfamoyl group, C1-20 alkylcarbonyl group, C1-20 alkylsulfonyl group, C1-20 alkylsulfonylamino group, C1-20 alkylcarbonylamino group, methylenedioxy group, heteroaryl group, and aryl group (wherein the aryl group is optionally substituted with 1 to 5 atoms or groups, selected from the group consisting of halogen atom, C1-20 alkyl group, C3-8 cycloalkyl group, C2-20 alkenyl group, C2-20 alkynyl group, hydroxy group, trifluoromethyl group, C2-12 perfluoroalkyl group, C1-20 alkoxy group, aryloxy group, trifluoromethoxy group, trifluoroethoxy group, C2-12 perfluoroalkoxy group, C1-20 alkylcarbonyl group, C1-20 alkylsulfonyl group, methylenedioxy group, cyano group, nitro group, amino group, carbazole group, and N(Ra)2 (wherein Ra is as defined above).