Porphyrin array exhibiting large two photon absorption property and including, as structural unit, bis (imidazolylporphyrin metal complex) linked with acetylenic bond and the derivative thereof, and method of producing the same

A porphyrin array exhibiting a two-photon absorption property, and being linked with an acetylenic bond(s), represented by formula (1-1) or (1-2):

• wherein
• R1 represents a substituted or unsubstituted alkyl group or substituted or unsubstituted aryl group;
• M1 represents a metal ion capable of serving as a core metal of the porphyrin ring and forming a coordinate bond with the imidazolyl group represented by Im;
• M2 represents either two protons or a metal ion incapable of forming a coordinate bond with the imidazolyl group represented by Im;
• R2 and R3 may be the same or different, and each independently represents a group selected from the group consisting of (a) to (f):
• (a) a porphyrin residue without a core metal or porphyrin complex residue having a core metal represented by M1 or M2, (b) a cyclic diimide residue, (c) a dialkylviologen residue, (d) a benzoquinone residue, (e) an N-methylpyrrolidine-fullerene derivative residue and (f) a ferrocene residue;
• Im is an imidazolyl group represented by Im1 or Im2:
• wherein R8 represents a methyl group or hydrogen atom;
• L1 represents a linking group represented by (—C≡C—)m wherein m represents an integer of 1 to 3;
• and
• n represents an integer of 1 or more.