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Sarkar B, Frantz S, Kaim W, et al. High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge. Dalton Trans. 2004;(21):3727-31doi: 10.1039/b407611g.
Sarkar, B., Frantz, S., Kaim, W., & Duboc, C. (2004). High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge. Dalton transactions (Cambridge, England : 2003), (21), 3727-31. https://doi.org/10.1039/b407611g
Sarkar, Biprajit, et al. "High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge." Dalton transactions (Cambridge, England : 2003) vol. ,21 (2004): 3727-31. doi: https://doi.org/10.1039/b407611g
Sarkar B, Frantz S, Kaim W, Duboc C. High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge. Dalton Trans. 2004 Nov 07;(21):3727-31. doi: 10.1039/b407611g. Epub 2004 Oct 08. PMID: 15510299.
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Dalton Trans. 2004 Nov 07;(21):3727-31. doi: 10.1039/b407611g. Epub 2004 Oct 08.

High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge.

Dalton transactions (Cambridge, England : 2003)

Biprajit Sarkar, Stéphanie Frantz, Wolfgang Kaim, Carole Duboc

Affiliations

  1. Institut für Anorganische Chemie, Universität Stuttgart, Germany.

PMID: 15510299 DOI: 10.1039/b407611g

Abstract

The radical complexes [(micro-L)[Ru(bpy)(2)](2)]*(3+), [(micro-bmtz)[Ru(cym)Cl](2)]*(+) and [(micro-L)[Re(CO)(3)Cl](2)]*(-), where L are 3,6-disubstituted 1,2,4,5-tetrazines such as 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (bmtz) and cym =p-cymene, were studied by X-band EPR in fluid solution and by 285 GHz EPR in glassy frozen solution. A comparison with other transition metal complexes (Cu, Rh, Os, Ir, Pt) involving tetrazine radical ligands reveals that the g anisotropy reflects (i) the pi acceptor effect of the tetrazine substituents, (ii) the competition from ancillary pi acceptor ligands for back donation from the metal, and (iii) the spin-orbit coupling contributions from the transition metal.

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