Abstract
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.
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