Polymer, a composition, and an electroluminescent device

A polymer comprising a structural unit represented by Chemical Formula (1):

• wherein, in Chemical Formula (1),
• Ar1 and Ar2 are each independently a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 60 carbon atoms,
• Ar3 is selected from Group (I):
• wherein, in Group (I),
• R111 to R123 are each independently a hydrogen atom or a linear or branched hydrocarbon group having 1 to 16 carbon atoms, and
• * indicates a bonding position with an adjacent atom,
• Ar4 is a substituted or unsubstituted divalent aromatic hydrocarbon group having 6 to 60 carbon atoms or a substituted or unsubstituted divalent aromatic heterocyclic ring group having 3 to 60 ring atoms,
• Ar5 is a single bond or a substituted or unsubstituted divalent aromatic heterocyclic ring group having 3 to 60 ring atoms,
• each R1 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkylthiol group, an alkoxy group, an alkoxyalkyl group, an alkylthioalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiocarbonyl group, a hydroxyl group, a carboxyl group, a thiocarboxyl group, a dithiocarboxyl group, a thiol group, or a cyano group,
• each R2 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkylthiol group, an alkoxy group, an alkoxyalkyl group, an alkylthioalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiocarbonyl group, a hydroxyl group, a carboxyl group, a thiocarboxyl group, a dithiocarboxyl group, a thiol group, a cyano group, and
• A is a structure represented by Chemical Formula (2) or Chemical Formula (3):
• wherein, in Chemical Formula (2),
• each Ar6 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkoxy group, an alkoxyalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiol group, an alkylthiocarbonyl group, a thiocarboxyl group, a dithiocarboxyl group, an alkylthioalkyl group, a hydroxyl group, a carboxyl group, a thiol group, a cyano group, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 60 carbon atoms, a substituted or unsubstituted monovalent aromatic heterocyclic ring group having 3 to 60 ring atoms, or a substituted or unsubstituted monovalent ring set group including a structure in which one or more aromatic hydrocarbon rings having 6 to 60 carbon atoms and one or more aromatic heterocyclic rings having 3 to 60 ring atoms are bonded through a single bond,
• each Ar7 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkoxy group, an alkoxyalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiol group, an alkylthiocarbonyl group, a thiocarboxyl group, a dithiocarboxyl group, an alkylthioalkyl group, a hydroxyl group, a carboxyl group, a thiol group, a cyano group, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 60 carbon atoms, a substituted or unsubstituted monovalent aromatic heterocyclic ring group having 3 to 60 ring atoms, or a substituted or unsubstituted monovalent ring set group including a structure in which one or more aromatic hydrocarbon rings having 6 to 60 carbon atoms and one or more aromatic heterocyclic rings having 3 to 60 ring atoms are bonded through a single bond,
• two or more Ar7s optionally form a condensed ring with the benzene ring to which two or more Ar7 are bonded, and
• * indicates a bonding position with an adjacent atom;
• wherein, in Chemical Formula (3),
• each Ar8 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkoxy group, an alkoxyalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiol group, an alkylthiocarbonyl group, a thiocarboxyl group, a dithiocarboxyl group, an alkylthioalkyl group, a hydroxyl group, a carboxyl group, a thiol group, a cyano group, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 60 carbon atoms, a substituted or unsubstituted monovalent aromatic heterocyclic ring group having 3 to 60 ring atoms, or a substituted or unsubstituted monovalent ring set group including a structure in which one or more aromatic hydrocarbon rings having 6 to 60 carbon atoms and one or more aromatic heterocyclic rings having 3 to 60 ring atoms are bonded through a single bond,
• each Ar9 is independently a hydrogen atom, an alkyl group, a hydroxyalkyl group, an alkoxy group, an alkoxyalkyl group, an alkenyl group, an alkynyl group, an alkylthio group, an alkoxycarbonyl group, an alkylthiol group, an alkylthiocarbonyl group, a thiocarboxyl group, a dithiocarboxyl group, an alkylthioalkyl group, a hydroxyl group, a carboxyl group, a thiol group, a cyano group, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 60 carbon atoms, a substituted or unsubstituted monovalent aromatic heterocyclic ring group having 3 to 60 ring atoms, or a substituted or unsubstituted monovalent ring set group including a structure in which one or more aromatic hydrocarbon rings having 6 to 60 carbon atoms and one or more aromatic heterocyclic rings having 3 to 60 ring atoms are bonded through a single bond,
• X is S, O, or C substituted with two substituted or unsubstituted linear or branched hydrocarbon groups having 1 to 16 carbon atoms,
• two or more Ar9s optionally form a condensed ring with the benzene ring to which two or more Ar9s are bonded, and
• * indicates a bonding position with an adjacent atom.