bis[,2,6-bis(1'-butylbenzimidazol-2'-yl)pyridine]cobalt(II)(2+) | 387389-86-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并咪唑类
• 英文名称: bis[,2,6-bis(1'-butylbenzimidazol-2'-yl)pyridine]cobalt(II)(2+)
• CAS: 387389-86-8
• 化学式: C₅₄H₅₈CoN₁₀
• 分子量: 906.115
• InChiKey: JBXRZVRDWLOSLT-UHFFFAOYSA-N

反应信息

• 作为反应物：
  描述：

  bis[,2,6-bis(1'-butylbenzimidazol-2'-yl)pyridine]cobalt(II)(2+) 、 nitrosonium tetrafluoroborate 以 乙腈 为溶剂， 生成 bis[,2,6-bis(1'-butylbenzimidazol-2'-yl)pyridine]cobalt(II)(3+)
  参考文献：
  名称：

  Co^II(dbbip)₂²⁺ Complex Rivals Tri-iodide/Iodide Redox Mediator in Dye-Sensitized Photovoltaic Cells

  摘要：

  Transient absorption spectroscopy was employed to study charge-transfer dynamics in dye-sensitized nanocrystalline solar cells (DSSC) containing a new one-electron redox mediator, cobalt(II)-bis[2,6-bis(1'-butylbenzimidazol-2'- yl)pyridine]. Photovoltaic cells incorporating this relay have yielded light-to-electricity power conversion efficiencies of up to 5.2%. This rivals the performance of the tri-iodide/iodide couple that is currently almost exclusively used in DSSC. Interception of the dye oxidized state by electron transfer from the Co(Il) complex in diluted electrolyte was found to follow a first-order kinetics with a rate constant of k(m) = 5 x 10(5) s(-1). Above a threshold of 10(-2) M, under which the cationic relay is essentially adsorbed onto the negatively charged particle surface, larger concentrations of the reduced mediator resulted in a linear increase of the apparent rate, yielding a second-order rate constant of k(m)" = 2.9 x 10(6) M-1 s(-1). Dynamics of the recombination reaction between injected conduction band electrons and the oxidized relay species was monitored spectroscopically, and a first-order rate constant of k(r) = 3 x 10(3) s(-1) was determined directly. This kinetic behavior compares approximately with that of the tri-iodide/iodide redox couple. Practical advantages of the Co-III/Co-II complex mediator, however, make it a promising candidate to replace this widely used system in DSSC.

  DOI：

  10.1021/jp012075a