European Journal of Inorganic Chemistry
European Journal of Inorganic Chemistry
4 years ago

Near Infra-Red S0T1 Transitions of Iridium(III) Phthalocyanine: Degeneracy of the T1 State Evidenced by Magnetic Circular Dichroism

Near Infra-Red S0T1 Transitions of Iridium(III) Phthalocyanine: Degeneracy of the T1 State Evidenced by Magnetic Circular Dichroism
Kazuyuki Ishii, Kei Murata
The lowest excited triplet (T1) state of an iridium(III) phthalocyanine (IrPc) complex was investigated by electronic absorption, magnetic circular dichroism (MCD), and emission spectroscopy. The introduction of the iridium(III) center, which possesses strong spin–orbit coupling, induced the appearance of transitions between the singlet ground state (S0) and the T1 state (S0T1). These transitions were characterized by room-temperature observations of: (i) the relatively intense, sharp T1S0 phosphorescence in the near infrared (NIR) region and (ii) the distinct S0T1 absorption band. Further, in addition to two Faraday A terms corresponding to the Q- and B-bands, a third Faraday A term was successfully observed for the S0T1 transition, indicating that the T1x and T1y states were degenerate in accordance with the expected D4h symmetry of the π-conjugated system of IrPc. To the best of our knowledge, this is the first observation of the Faraday A term of the S0T1 transition in porphyrin compounds.The lowest excited triplet (T1) state of an iridium(III) phthalocyanine (IrPc) complex was investigated by electronic absorption, magnetic circular dichroism (MCD), and emission spectroscopy. The Faraday A term was successfully observed for the S0T1 transition in the MCD spectrum, indicating the degeneracy of the T1 state.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700668

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