Polymer compound containing nitrogen-containing heterocyclic structure, and composition, solution, thin film and polymer light-emitting element each containing same

A compound represented by formula (6):

• wherein in formula (6), ring A3 and ring A4 are the same or different and each represents an aromatic hydrocarbon ring that may have a substituent;
• Y1 and Y2 are the same or different and each represents a hydrogen atom or a polymerizable reactive group;
• and X3 and X4 are the same or different and each represents a hydrogen atom or a substituent, provided that at least one of X3 and X4 is a group represented by formula (7):
• wherein in formula (7), Q1, Q2 and Q3 are the same or different and each represents —N═ or —CH═, provided that at least two of Q1, Q2 and Q3 are —N═;
• q represents an integer of 0 or more;
• p1 to p6 are the same or different and each represents an integer of 0 or more, provided that p1+p2+p3≧1 and p4+p5+p6≧1;
• S1 to S6 are the same or different and each represents a hydrogen atom, a halogeno group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an alkylsilyl group, or a group represented by formula (8);
• S7 to 518 are the same or different and each represents a hydrogen atom, a halogeno group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, an alkylthio group, an aryl group, an alkylsilyl group, or a group represented by formula (8);
• and when a plurality of each S7 to S18 exist, they may be the same or different:
• wherein in formula (8), i represents an integer of 1 to 6, j represents an integer of 1 to 6, and k represents an integer of 0 to 5;
• and when a plurality of j exist, they may be the same or different.