2001
DOI: 10.1107/s0909049500015971
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Characterization of the ruthenium–dinitrogen tetraamine complexes by XAFS spectroscopy

Abstract: A reaction between N2 and trans-Ru(II)Cl2L (L=2,5,9,12-tetramethyl-2.5,9,12-tetraazatridecane) in aqueous solutions has been investigated by XAFS spectroscopy. Ru K-edge EXAFS clearly revealed that there exists an N2-bridged binuclear complex and that the Ru-Ru distance is 4.96 A with the coordination number of 0.5. The Ru K-edge energies of the N2 complexes are closer to that of Ru(III)Cl2L+ rather than that of Ru(II)Cl2L, indicating back donation from the Ru dpi to the N2 pi* orbitals.

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Cited by 8 publications
(3 citation statements)
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“…Solid and solution samples in each state gave the same spectra. They all showed the typical shape of Ru O h complex with a small edge shift to a higher energy at each oxidation step. This suggests that the coordination environment around the Ru ion is maintained during the oxidation process.…”
Section: Resultsmentioning
confidence: 90%
“…Solid and solution samples in each state gave the same spectra. They all showed the typical shape of Ru O h complex with a small edge shift to a higher energy at each oxidation step. This suggests that the coordination environment around the Ru ion is maintained during the oxidation process.…”
Section: Resultsmentioning
confidence: 90%
“…The raw data were energy calibrated (Ru K-edge energy of RuCl 3 : 22.12 keV [38], first inflection point), background corrected and normalized using the WINXAS 3.1 software [38] according to typical procedures described earlier [39,40]. Fourier transformation of EXAFS data was applied to the k 1 -weighted functions in the interval k = 3-13Å −1 .…”
Section: X-ray Absorption (Xas) Measurementsmentioning
confidence: 99%
“…Finally, the shift is similar for commercial RuCl 3 , and we could presume that the oxidation state of the ruthenium in the colloidal solution is 3+. The XANES spectrum for the colloids shows some similar features to those obtained by Ohta et al 32,33 and was attributed to RuO h complex structure. A shoulder is also visible on the Ru colloids sample in the rising edge (pre-edge) of the spectrum.…”
Section: ■ Results and Discussionmentioning
confidence: 99%