The synthesis and electrochemistry of 2,5-dimethylazaferrocenes with heteroaryl bridges
摘要:
We report on the synthesis of complexes having two equivalent redox active 2,5-dimethylazaferrocenyl entities connected by heteroaryl (heteroaryl = thiophenyl, bithiophenyl and pyridyl) bridges. The new compounds have been investigated by various electrochemical techniques including cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SW) and were found to exhibit two consecutive reversible or partially reversible one-electron oxidations. Comproportionation constants (K-c) calculated from Delta E-1/2 values indicate that the thermodynamic stability of their monoxidized forms exceeds those of analogous ferrocenes. In this paper we also report the X-ray crystal structure and UV-Vis spectroelectrochemistry of parent 2,5-dimethylazaferrocene. (C) 2008 Elsevier B.V. All rights reserved.
The synthesis, structures, and electrochemistry of 1′-heteroaryl-2,5-dimethylazaferrocenes
摘要:
We report the synthesis of 1'-heteroaryl-2,5-dimethylazaferrocenes (heteroaryl = 2-bromothiophen-5-yl and 2-bromopyrid-6-yl) via palladium catalysed cross-coupling reactions along with their crystallographically determined structures. The newly synthesized compounds as well as the parent 2,5-dimethylazaferrocene have been investigated by cyclic voltammetry (CV) and were found to exhibit reversible first oxidations followed by an irreversible oxidation at considerably higher potential. (C) 2008 Elsevier B.V. All rights reserved.