Nuclear resonance vibrational spectroscopy

Petrenko T, DeBeer George S, Aliaga-Alcalde N, et al. Characterization of a genuine iron (V)-nitrido species by nuclear resonant vibrational spectroscopy coupled to density functional calculations. J Am Chem Soc. 2007 129 11053-60. 

George SJ, Igarashi RY, Xiao Y, et al. Extended X-ray absorption fine structure and nuclear resonance vibrational spectroscopy reveal that NifB-co, a FeMo-co precursor, comprises a 6Fe core with an interstitial light atom. J Am Chem Soc. 2008 130 5673-80. 

Xiao YM, Fisher K, Smith MC, et al. How nitrogenase shakes-initial information about P-cluster and FeMo-cofactor normal modes from nuclear resonance vibrational spectroscopy (NRVS). J Am Chem Soc. 2006 128 7608-12. 

Because of the broad coverage of this article, we will limit ourselves to the study of stmctural and electronic properties of iron centers by Fe Mossbauer spectroscopy. If the reader is interested in the determination of dynamic properties both by conventional and synchrotron-based Mossbauer spectroscopy, we refer them to the articles by Parak, and Paulsen et as well as to the contribution of Scheidt and Sage in this volume see Nuclear Resonance Vibrational Spectroscopy (NR VS)). 

Bogdan. M. Leu. Nuclear Resonance Vibrational Spectroscopy A Quantitative Picture of Iron Dynamics in Heme Proteins and Model Compounds. Ph. D. dissertation. Northeastern University, Department of Physics, 2006. 

The IR spectrum of Feni(TPP)(0N02)N0 at low-temperatures has vFe-NO at 548 cm-1 284 The resonance Raman spectrum of NO-bound ferric derivatives of wild-type and mutated (BIO Tyr - Phe) FIbN (a haemoglobin from Mycobacterium tuberculosis) showed vFe-NO and 8Fe-N-0 at 591, 579 cm-1 respectively.285 Nuclear resonance vibrational spectroscopy has been used to identify a number of modes involving motion of iron in the plane of the porphyrin in nitrosyl porphyrins, e.g. Fe NO torsion modes at 27 and 54 cm 1 in Fe(TPP)NO 286... 

APD = avalanche photodiode detector APS = advanced photon source DFT = density functional theory ESRF = European synchrotron radiation facility HOPE = high-density polyethylene IR = infrared INS = inelastic neutron scattering KED = kinetic energy distribution Mb = myoglobin NIS = nuclear inelastic scattering NRVS = nuclear resonance vibrational spectroscopy NRIXS = nuclear resonant inelastic X-ray scattering OEP = octaethylporphyrin sGC = soluble guanylate cyclase VDOS = vibrational density of states. 

Significant complementary data on the metal sites in proteins have also been obtained using the technique of nuclear inelastic scattering spectroscopy (NIES), also known as nuclear resonance vibrational spectroscopy. NIES probes the vibrational modes which directly involve motion of Mossbauer-active nuclei such as Fe. Thus the spectra are dominated by Fe-ligand modes associated with actual displacement of the Fe atom, such as the low frequency doming modes of heme.The NIES technique has also had a definitive role in the study of Fe(II) mono- and polymeric spin-crossover species and that work has been well reviewed recently. Spin-crossover complexes are the topic of separate discussion in Section 4 below. 

---