Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (08): 2158-2162.doi: 10.3866/PKU.WHXB20100822

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Optical and Electrochemical Properties of Ethynyl-Bridged Ferrocenes with Electron Donor Groups

CAO Qian-Yong1, LU Xin1, KUANG Ren-Yun2, LI Zhi-Hua1, YANG Zhen-Yu1   

  1. 1. Department of Chemistry, Nanchang University, Nanchang 330031, P. R. China;
    2. College of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an 343009, Jiangxi Province, P. R. China
  • Received:2010-01-05 Revised:2010-04-06 Published:2010-07-23
  • Contact: CAO Qian-Yong E-mail:cqyong@ncu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20963007), Bureau of Education of Jiangxi Province, China (GJJ09074) and Program for Innovative Research Team of Nanchang University, China.

Abstract:

We present the synthesis, optical and electrochemical properties of three ethynyl-bridged ferrocenes with electron donor groups, Fc—C≡C—Ph-(p-OMe) (3a), Fc—C≡C—Ph-(p-NMe2) (3b) and Fc—C≡C—Ph—(p-NPh2) (3c). All three compounds show a Fe(II)Cp—C≡C—Ph—(p-R) (Cp=cyclopentadienyl) metal to ligand charge transition (MLCT) in 400-550 nm. Upon oxidation, 3a and 3c show a Cp—C≡C—Ph—(p-R)Fe(III) ligand to metal charge transition (LMCT) in the near-IR range (946 and 1044 nm). A reversible Fc+/Fc potential for 3a-3c and an irreversible Ph—NR+2/Ph—NR2 potential for 3b and 3c are observed by in the cyclic and differential pulse voltammetry. Finally, 3b shows an optical and electrochemical response upon protonation, with a red shift of the MLCT transition, an anodic shift of the Fc+/Fc potential, and disappearance of the Ph—NR+2/Ph—NR2 peak.

Key words: Ferrocene, Protonation, Absorption spectrum, Oxidation, Electrochemistry

MSC2000: 

  • O646