Dichroic pigment compounds and compositions containing the same

A compound represented by the following Formula (1):

• where:
• R1 represents a hydrogen atom, a C1-C20 alkyl group, a C1-C20 alkoxy group, a C1-C20 acyl group, a C2-C20 alkoxycarbonyl group, a C1-C20 acyloxy group, or —N(R10)(R11);
• R10 represents a C1-C20 acyl group, a C1-C20 alkylsulfonyl group, or a C6-C20 arylsulfonyl group;
• R11 represents a hydrogen atom or a C1-C20 alkyl group;
• R10 and R11 can bond to each other, and form, with a nitrogen atom to which R10 and R11 bond, a ring including —N—CO— or —N—SO2—;
• at least one hydrogen atom of any of the alkyl group, the alkoxy group, the acyl group, the alkoxycarbonyl group, the acyloxy group, the alkylsulfonyl group, and the arylsulfonyl group can be substituted by a halogen atom, a hydroxy group, an unsubstituted amino group, or a substituted amino group;
• —O— or —NR20— can be inserted between carbon atoms of any of the alkyl group and the alkoxy group;
• and R20 represents a hydrogen atom or a C1-C20 alkyl group;
• R2 through R4 are substituents which are not hydrogen atoms and each independently represent a C1-C4 alkyl group, a C1-C4 alkoxy group, a halogen atom, or a cyano group;
• at least one hydrogen atom of any of the alkyl group and the alkoxy group can be substituted by a halogen atom or a hydroxy group;
• and n, m, and p are each independently an integer of 0 to 2;
• and
• Ar1 represents a nitrogen-containing saturated heterocyclic group which is a 5 to 8-membered ring and in which (i) N is bonded to the phenylene group and (ii) at least one β-position to the ring nitrogen is an oxygen atom or a sulfur atom, and 1 to 6 of hydrogen atoms bonded to the ring of the nitrogen-containing saturated heterocyclic group can be substituted by a C1-C3 alkyl group.