Syntheses and electronic properties of the nickel and palladium complexes of the octaethylporphyrin(M1)–(dihexylbithiophene)n–octaethylporphyrin(M2) system [OEP(M1)–(DHBTh)n–OEP(M2)] connected with the diacetylene linkage. A methodology for molecular desi

The palladium complexes of highly extended π-electronic conjugation system, octaethylporphyrin(Pd)–(dihexylbithiophene)n–octaethylporphyrin(Pd) [OEP(Pd)–(DHBTh)n–OEP(Pd), n=1–6], were synthesized, in which all the chromophores are connected with diacetylene linkage. The unsymmetrical derivatives of OEP(Ni)–DHBTh–OEP(Pd) were also successfully synthesized. Electronic properties of these symmetrical and unsymmetrical complexes were conclusively described, as compared with those of OEP(Ni)–(DHBTh)n–OEP(Ni). Based on the structure elements, a methodical guiding principle for molecular design of the particular electronic structure will be proposed.