Synthesis and Properties of Head-to-head, Head-to-tail, and Tail-to-tail Orientational Isomers of Extended Dihexylbithiophene–Octaethylporphyrin System [OEP–(DHBT)<sub><i>n</i></sub>–OEP] Connected with 1,3-Butadiyne Linkages
An extended π-electronic conjugation system of dihexylbithiophene–octaethylporphyrin [OEP–(DHBT)n–OEP; n = 1–5], all the chromophores in which are connected with the linkage of 1,3-butadiyne (diacetylene), was synthesized by an oxidative cross-coupling reaction of the corresponding terminal acetylenes. Absorption spectral and electrochemical properties of the OEP–(DHBT)n–OEP system were examined. The results proved that the orientation of two 3-hexylthiophene (3HTh) rings of DHBT plays an important role in electronic communications between the two terminal OEP rings.
二己基联噻吩-八乙基卟啉的扩展 π 电子共轭体系 [OEP-(DHBT)n-OEP; n = 1–5],其中所有发色团均与 1,3-丁二炔(丁二炔)键连接,通过相应末端乙炔的氧化交叉偶联反应合成。检查了 OEP-(DHBT)n-OEP 系统的吸收光谱和电化学性质。结果证明DHBT的两个3-己基噻吩(3HTh)环的取向在两个末端OEP环之间的电子通信中起着重要作用。
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 design of the particular electronic structure
The palladium complexes of highly extended pi-electronic conjugation system, octaethyl porphyrin (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. (C) 2004 Elsevier Ltd. All rights reserved.
Group 14 Dithienometallole-Linked Ethynylene-Conjugated Porphyrin Dimers
The considerably conjugated π systems of the group 14 dithienometallole-linked ethynylene-conjugated porphyrindimers (1Ms) were described based on comprehensive experimental and theoretical studies. The electronic absorption spectra of 1M displayed a large splitting in the Soret band and a red-shifted Q-band, indicating that the dithienometallole spacer was effective in facilitating the porphyrin–porphyrin