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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 104, 2006 - Issue 10-11: A Special Issue in Honour of Professor Keith McLauchlan
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Original Articles

A new series of radical–triplet pairs: modulation of radical–triplet interaction by a counter ion

Luca Maretti Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980-8577, Japan
,
Islam S. M. Saiful Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980-8577, Japan
,
Takashi Kajiwara Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Aramaki, Sendai 908-8578, Japan
,
Ryo Miyamoto Department of Materials Science and Technology, Faculty of Science and Technology, Hirosaki University, Bunkyo-cho, Hirosaki, Aomori 036-856, Japan
,
Yasunori Ohba Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980-8577, Japan; CREST, JST
&
Seigo Yamauchi Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Katahira 2-1-1, Sendai 980-8577, JapanCorrespondence[email protected]
Pages 1619-1626 | Received 13 Oct 2005, Published online: 28 Nov 2010
 
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Abstract

Bis-(quinoline-TEMPO)-yttrium-tetraphenylporphyrin complexes having potassium and silver counter cations have been studied by cw-EPR in their ground states and by time-resolved (TR) EPR and two-dimensional (2D) nutation spectroscopy in the excited states after laser excitation. Simulations of the TR-EPR spectra at 30 K and at room temperature were made, yielding zero-field splitting parameters D and E, and g values. The parameters obtained together with the nutation frequencies clearly assigned the excited states of the bis-radical complexes having counter cations of potassium and silver as quartet and quintet states, respectively. This result is explained by modulation of radical–triplet interactions by the counter ion due to different sizes of metal ions.

Acknowledgements

This work was supported by Grant-in-Aid for Scientific Researches nr. 165500031 from the Ministry of Education, Science, Culture, and Sports, Japan.

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