Dynamics of muoniated radical states in phthalocyanines

• Autor(a) principal: Piroto Duarte, J.
• Data de Publicação: 2006
• Outros Autores: Vilão, R. C., Alberto, H. V., Gil, J. M., Gil, Francisco P. S. C., Weidinger, A., Campos, N. Ayres de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/4410; https://doi.org/10.1016/j.physb.2005.11.123
• topic: Organic semiconductors; Phthalocyanine; Muoniated radicals; Spin dynamics

This work reports a spectroscopic and spin-dynamics [mu]SR study of the positive muon states formed in the phthalocyanines Zn-Pc, H2-Pc and Cu-Pc. In Zn-Pc and H2-Pc, three distinct muoniated radicals are formed, seen to undergo spin-dynamical processes with charge carriers. Two of the states have very similar hyperfine interaction values, and are believed to be due to muon addition at the outer benzene rings. The third one has a significantly lower hyperfine constant, and is tentatively assigned to addition at an inner part of the molecule. In Cu-Pc, the [mu]SR signals found are diamagnetic-like, and the muon seems to be shielded from interactions with charge carriers and local molecular motion.