Journal
MOLECULAR PHYSICS
Volume 111, Issue 18-19, Pages 2788-2808Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2013.830783
Keywords
transition metal; solvation; EPR; EDNMR; ENDOR; high-field
Funding
- Cluster of Excellence RESOLV [EXC 1069]
- Deutsche Forschungsgemeinschaft
- Max-Planck-Gesellschaft
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ELDOR-detected NMR (EDNMR) spectra for a series of hydrated transition metal complexes: Mn-II(H2O)(6), Cu-II(H2O)(6) and (VO)-O-IV(H2O)(5) are reported. All EDNMR experiments were performed at W-band (94GHz) employing two independent microwave frequencies. A purpose-built broadband microwave resonator (spectral range 300MHz) was used, sufficient to detect all single quantum nuclear transitions of the three model systems. The EDNMR spectral lineshape observed is essentially the same as in conventional ENDOR (Electron-Nuclear Double Resonance). EDNMR presents two technical advantages over ENDOR for transition metal complexes: (i) enhanced sensitivity, reducing acquisition times by at least one order of magnitude; and (ii) simultaneous detection of transitions from all magnetic nuclei. This includes ligand (H-1, H-2, O-17) and metal centred hyperfine couplings. For the latter, both isotropic couplings in the case of the Mn-55 complex and highly anisotropic couplings in the case of V-51 and Cu-63,Cu-65 complexes could be resolved. By monitoring the intensity of the EDNMR lines as function of the amplitude of the pumping microwave pulse, transitions from non-equivalent nuclei can be differentiated. Double quantum transitions are also readily identified. In case of the Mn-II((H2O)-O-17)(6) complex, spectral lines involving the simultaneous pumping of both the Mn-55 and O-17 nuclear transitions are observed.
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