Direct Probe of NO Vibration in the Naked Ferric Heme Nitrosyl Complex

Intrinsic Properties of Nitric Oxide Binding to Ferrous and Ferric Hemes

“…The IRMPD spectra, bearing a direct relationship with the linear IR spectrum of the sampled species, 32 have been recorded in the structurally diagnostic 'fingerprint' region and are displayed in Figure 6. 43,44 Extensive portions of the spectra are very similar, as expected from the close similarity of the two complexes. For example, the 1000−1220 cm has been reported for a five-coordinate nitrosyliron(II) complex, Fe(Porph)(NO), where Porph is the dianion of protoporphyrin IX dimethyl ester, sampled by IR spectroscopy in KBr pellet.…”

Absorption in the Q-band region by isolated ferric heme+ and heme+(histidine) in vacuo

“…6 Gas-phase experiments are therefore useful to elucidate the influence of a nearby environment, determined by the protein folding state, from the inherent properties of the heme. 11 Furthermore, our work containing the absorption spectra and fragmentation spectra of Fe͑III͒-heme + and Fe͑III͒-heme + ͑his͒ ͑his denotes histidine͒ in the Soret band region was recently published. It has included studies on the photoexcitation of porphyrin radical anions stored in an electrostatic storage ring, 7 and measurements of the absorption spectra of metallophthalocyanine anions and Fe͑III͒-heme + ͑DMSO͒ in the Q-band region ͑DMSO denotes dimethylsulfoxide͒.…”

Nitrosyl–heme and anion–arene complexes: structure, reactivity and spectroscopy

“…In the isolated gas phase one can deal with iron(II)/(III)-hemes in a strictly comparable coordination environment, unveiling the neat interaction of NO with a heme center [13]. An overview is presented of our gas phase studies which have comprised: (i) selecting proper precursors to form the ions of interest; (ii) surveying the plausible structures that may account for the sampled ions by computational approaches; (iii) examining the gas phase reactivity (iv) probing vibrational features to further characterize electronic and geometric structures [14][15][16][17][18][19].…”