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Lecture

Metallacarboranes for Electric materials



Polymers that alter their properties after gaining or losing electrons in a reversible way are redox polymers. This characteristic can be extended to materials in general, so it is possible to talk about redox materials. To have redox polymers or redox materials it is required to have a reversible and stable redox system, preferably an outer sphere ET system. Commonly redox polymers are made of a conducting organic polymer (COP) backbone such as polypyrrole (PPy), polythiophene (PTh), and polyethylene dioxythiophene (PEDOT), and in their side-groups, they incorporate their redox reversible system, mostly made of ferrocene. [1] This is a neutral 18 electron counting complex.

Metallacarboranes of which cobaltabisdicarbollide [Co(C2B9H11)2]-, [COSANE]-, is the most researched, is a highly stable species with large possibilities for functionalization. [COSANE]- in its more common form is anionic, is an 18 electron obeying complex, has a sandwich structure, is redox reversible with 3 well documented redox couples and presents an outer sphere electron transfer mechanism. The metallacarboranes offer a unique opportunity to perform as doping agents as there are very few anions that have the chemical, physical and electrochemical properties described earlier. We have utilized metallacarboranes both as components of pendant arms and as doping agents in PPy, [2] and PEDOT polymers. [3] Comparison of the PEDOT/PSS and PEDOT/COSANE has been done. The electronic conductivity and ionic conductivity of salts of COSANE alone or in Polybenzimidazole, PBI, [4] have been studied along with their capacitance in conventional activated carbons. [5] All these issues will be reported in this presentation.

[1] R. Núñez, I. Romero, F. Teixidor, C. Viñas, Chem. Soc. Rev., 2015, 45(19), 5137.

[2] a) C. Masalles, J. Llop, C. Viñas, F. Teixidor, Adv. Mater., 2002, 14, 862; b) C. Masalles, S. Borros, C. Viñas, F. Teixidor, Adv. Mater., 2002, 14, 449; c) C. Masalles, S. Borros, C. Viñas, F. Teixidor, Adv. Mate., 2000, 12, 1199.

[3] V. David, C. Vinas, F. Teixidor, Polymer, 2006, 13, 4694.

[4] a) I. Fuentes, A. Andrio, F. Teixidor, C. Viñas, V. Compan, Phys.Chem.Chem.Phys., 2017, 19, 15177; b) I. Fuentes, A. Andrio, A. Garcia-Bernabe, J. Escorihuela, C. Viñas, F. Teixidor, V. Compan, Phys.Chem.Chem.Phys., 2018, 20, 10173.

[5] R. Ruiz-Rosas, I. Fuentes, C. Viñas, F. Teixidor, E. Morallon, D. Cazorla-Amoros, Sustainable & energy fuels, 2018, 2, 345.


 

Speaker:
Prof. Francesc Teixidor
Institut de Ci?ncia de Materials de Barcelona
Additional Authors:
  • Prof. Dr. Clara Viñas
    CSIC
  • Prof. Dr. Vicente Compañ
    Universitat Politècnica de València

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