| abstract |
An aromatic compound of the following formula (1), (2), (5) or (6), n n n n n n n n n n n n wherein, Ar 1 and Ar 3 represent a tetra-valent aromatic hydrocarbon group or a tetra-valent heterocyclic group, and Ar 2 , Ar 4 , Ar 5 , Ar 6 and Ar 7 represent a tri-valent aromatic hydrocarbon group or a tri-valent heterocyclic group, A 1 represents —Z 1 —, —Z 2 —Z 3 — or —Z 4 ═Z 5 —, wherein Z 1 , Z 2 and Z 3 represent O, S or the like and Z 4 and Z 5 represent N, B, P or the like, X 1 , X 2 , X 3 , X 4 , X 9 , X 10 , X 11 , and X 12 represent a halogen atom or the like. |