Spectral Studies of Coordination of 1-Methyl-2-(pyridin-4-yl)-3,4-fullero[60]pyrrolidine by Highly Substituted Cobalt(II) Porphyrin

A new dendrimeric cobalt(II) complex CoP has been obtained when reacting (5,15-bis[3,5-bis(tert-butyl)phenyl]-10,20-bis{4,6-bis[3,5-bis(3,6-di-tert-butylcarbazole-9-yl)phenoxy]pyrimidin-5-yl}porphine with Co(AcO)(2)center dot 4H(2)O. The process of two-step two-way coordination of 1-methyl-2-(pyridin-4'-yl)-3,4-fullero[60]pyrrolidine (PyC60) with cobalt(II) porphyrin ends with the formation of a stable 1 : 2 complex, a triad of composition (PyC60)(2)CoP. The process has been completely kinetically described using UV-vis and fluorescent spectroscopy data. The stability constant (K) of the coordination complex is (9.9 +/- 2.4) x 10(8) L-2 mol(-2) (log K = 9.0). The chemical structure of the triad has been determined by UV-vis, H-1 NMR, and IR spectroscopy. The effect of PyC60 fluorescence quenching in the triad has been found and studied, and the static mechanism of the quenching process has been substantiated. The result can be used in optoelectronics to optimize the structures of donor-acceptor systems with the property of photoinduced electron transfer.

Automated summary

A new dendrimeric cobalt(II) complex CoP was synthesized and characterized, along with the discovery and investigation of the fluorescence quenching effect of PyC60 in the complex. The study provides valuable insights into the static mechanism of the quenching process and has implications for optimizing the structures of donor-acceptor systems in optoelectronics.