Abstract
Electron spin dynamics of the photoexcited state of a new porphyrin system built of a zinc porphyrin molecule with a linked complex of copper ion (ZnPCu) was studied using electron paramagnetic resonance (EPR) methods. The time-resolved continuous-wave and echo-detected EPR data show that electron spins of the ZnPCu system are polarized. The shape of the EPR spectrum and the echo-detected nutation spectroscopy data indicate that there is a relatively small spin–spin interaction between two subunits, namely, less than the zero-field splitting parameter of the excited triplet ZnP molecule. Results have been interpreted assuming that the S = 1 Zn porphyrin subunit electron spins are polarized via the triplet mechanism and this polarization is transferred to the S = 1/2 copper subunit via a flip-flop process induced by the exchange interaction between these subunits. The formation of the integral spin polarization in the triplet–doublet system as a function of the value and type of the triplet–doublet interaction was analyzed.
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Acknowledgments
We are grateful to Professor Art van der Est for the comments. This work was supported in part by the Russian Foundation for Basic Research (project no. 12-03-97078-p), the Government of the Republic of Tatarstan and the Division of Physical Sciences, Russian Academy of Sciences (II.4) and the President of the Russian Federation “Leading scientific schools” (project no. NSh-4653.2014.2).
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Sukhanov, A.A., Konov, K.B., Salikhov, K.M. et al. Time-Resolved Continuous-Wave and Pulse EPR Investigation of Photoinduced States of Zinc Porphyrin Linked with an Ethylenediamine Copper Complex. Appl Magn Reson 46, 1199–1220 (2015). https://doi.org/10.1007/s00723-015-0705-0
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DOI: https://doi.org/10.1007/s00723-015-0705-0