Patent ID: 7022840

Claim:
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 R 1 represents a substituted or unsubstituted alkyl group or substituted or unsubstituted aryl group; M 1 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; M 2 represents either two protons or a metal ion incapable of forming a coordinate bond with the imidazolyl group represented by Im; R 2 and R 3 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 M 1 or M 2 , (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 Im 1 or Im 2 : wherein R 8 represents a methyl group or hydrogen atom; L 1 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.