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Shafizadeh N, Crestoni ME, de la Lande A, Soep B. Heme ligation in the gas phase. INT REV PHYS CHEM 2021. [DOI: 10.1080/0144235x.2021.1952006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza”, Roma, Italy
| | | | - Benoît Soep
- ISMO-CNRS, Université Paris Saclay, Orsay Cedex, France
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Oxidative catalytic evolution of redox- and spin-states of a Fe-phthalocyanine studied by EPR. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.02.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Sakow D, Baabe D, Böker B, Burghaus O, Funk M, Kleeberg C, Menzel D, Pietzonka C, Bröring M. Iron 10-Thiacorroles: Bioinspired Iron(III) Complexes with an Intermediate Spin (S=3/2) Ground State. Chemistry 2014; 20:2913-24. [DOI: 10.1002/chem.201303786] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 10/17/2013] [Indexed: 11/07/2022]
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Weiss R, Gold A, Terner J. Cytochromes c‘: Biological Models for the S = 3/2,5/2 Spin-State Admixture? Chem Rev 2006; 106:2550-79. [PMID: 16771459 DOI: 10.1021/cr040416l] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raymond Weiss
- Laboratoire de Chimie Supramoléculaires, Institut de Science et d'Ingénierie Supramoléculaires, Université Louis Pasteur de Strasbourg, 8 Allée Gaspard Monge, B.P.70028, F-67083 Strasbourg Cedex, France
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Ohgo Y, Ikeue T, Takahashi M, Takeda M, Nakamura M. Anomalous Difference in Magnetic Behavior between Highly Saddled Iron(III) Porphyrin Complexes in the Solid State. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300566] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ikeue T, Ohgo Y, Ongayi O, Vicente MGH, Nakamura M. Difference in spin crossover pathways among saddle-shaped six-coordinated iron(III) porphyrin complexes. Inorg Chem 2003; 42:5560-71. [PMID: 12950204 DOI: 10.1021/ic0300969] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electronic states of a series of saddle-shaped porphyrin complexes [Fe(OMTPP)L(2)](+) and [Fe(TBTXP)L(2)](+) have been examined in solution by (1)H NMR, (13)C NMR, and EPR spectroscopy and by magnetic measurements. While [Fe(OMTPP)(DMAP)(2)](+) and [Fe(TBTXP)(DMAP)(2)](+) maintain the low-spin (S = (1)/(2)) state, [Fe(OMTPP)(THF)(2)](+) and [Fe(TBTXP)(THF)(2)](+) exhibit an essentially pure intermediate-spin (S = (3)/(2)) state over a wide range of temperatures. In contrast, the Py and 4-CNPy complexes of OMTPP and TBTXP exhibit a spin transition from S = (3)/(2) to S = (1)/(2) as the temperature was decreased from 300 to 200 K. Thus, the magnetic behavior of these complexes is similar to that of [Fe(OETPP)Py(2)](+) reported in our previous paper (Ikeue, T.; Ohgo, Y.; Yamaguchi, T.; Takahashi, M.; Takeda, M.; Nakamura, M. Angew. Chem., Int. Ed. 2001, 40, 2617-2620) in the context that all these complexes exhibit a novel spin crossover phenomenon in solution. Close examination of the NMR and EPR data of [Fe(OMTPP)L(2)](+) and [Fe(TBTXP)L(2)](+) (L = Py, 4-CNPy) revealed, however, that these complexes adopt the less common (d(xz), d(yz))(4)(d(xy))(1) electron configuration at low temperature in contrast to [Fe(OETPP)Py(2)](+) which shows the common (d(xy))(2)(d(xz), d(yz))(3) electron configuration. These observations have been attributed to the flexible nature of the OMTPP and TBTXP cores as compared with that of OETPP; the relatively flexible OMTPP and TBTXP cores can ruffle the porphyrin ring and adopt the (d(xz), d(yz))(4)(d(xy))(1) electron configuration at low temperature. Therefore, this study reveals that the rigidity of porphyrin cores is an important factor in determining the spin crossover pathways.
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Affiliation(s)
- Takahisa Ikeue
- Department of Chemistry, School of Medicine, Toho University, Tokyo 143-8540, Japan
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Ikezaki A, Nakamura M. Models for cytochromes c': spin states of mono(imidazole)-ligated (meso-tetramesitylporphyrinato)iron(III) complexes as studied by UV-Vis, 13C NMR, 1H NMR, and EPR spectroscopy. Inorg Chem 2002; 41:6225-36. [PMID: 12444764 DOI: 10.1021/ic020378t] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A number of mono(imidazole)-ligated complexes of perchloro(meso-tetramesitylporphyrinato)iron(III), [Fe(TMP)L]ClO(4), have been prepared, and their spin states have been examined by (1)H NMR, (13)C NMR, and EPR spectroscopy as well as solution magnetic moments. All the complexes examined have shown a quantum mechanical spin admixed state of high and intermediate-spin (S = 5/2 and 3/2) states though the contribution of the S = 3/2 state varies depending on the nature of axial ligands. While the complex with extremely bulky 2-tert-butylimidazole (2-(t)()BuIm) has exhibited an essentially pure S = 5/2 state, the complex with electron-deficient 4,5-dichloroimidazole (4,5-Cl(2)Im) adopts an S = 3/2 state with 30% of the S = 5/2 spin admixture. On the basis of the (1)H and (13)C NMR results, we have concluded that the S = 3/2 contribution at ambient temperature increases according to the following order: 2-(t)BuIm < 2-(1-EtPr)Im < 2-MeIm <or= 2-EtIm <or= 2-(i)PrIm < 4,5-Cl(2)Im. The effective magnetic moments determined by the Evans method in CH(2)Cl(2) solution are 5.9 and 5.0 mu(B) at 25 degrees C for [Fe(TMP)(2-(t)BuIm)]ClO(4) and [Fe(TMP)(2-MeIm)]ClO(4), respectively, which further verify the order given above. Comparison of the NMR and EPR data has revealed that the S = 3/2 contribution changes sensitively by the temperature; the S = 3/2 contribution decreases as the temperature is lowered for all the mono(imidazole) complexes examined in this study. The solvent polarity also affects the spin state; polar solvents such as methanol and acetonitrile increase the S = 3/2 contribution while nonpolar solvents such as benzene decrease it. These results are explained in terms of the structurally flexible nature of the mono(imidazole) complexes; structural parameters such as the Fe(III)-N(axial) bond length, displacement of the iron from the N4 core, tilting of the Fe(III)-N(axial) bond to the heme normal, orientation of the coordinated imidazole ligand, etc., could be altered by the nature of the axial ligands as well as by the solvent polarity and temperature. Some mysteries on the spin states of cytochromes c' isolated from various bacterial sources are possibly explained in terms of the flexible nature of the mono(imidazole)-ligated structure.
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Affiliation(s)
- Akira Ikezaki
- Department of Chemistry, School of Medicine, Toho University, Tokyo 143-8540, Japan
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Ikeue T, Ohgo Y, Saitoh T, Yamaguchi T, Nakamura M. Factors affecting the electronic ground state of low-spin iron(III) porphyrin complexes. Inorg Chem 2001; 40:3423-34. [PMID: 11421688 DOI: 10.1021/ic001412b] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To determine the factors affecting the ground-state electron configuration of low-spin Fe(III) porphyrin complexes, we have examined the (1)H NMR, (13)C NMR, and EPR spectra of a series of low-spin bis-ligated Fe(III) porphyrin complexes [Fe(Por)L(2)](+/-), in which the positions of porphyrin substituents and the coordination ability of axial ligands are different. The seven porphyrins used in this study are meso-tetraalkylporphyrins (TRP: R is propyl, cyclopropyl, or isopropyl), meso-tetraphenylporphyrin (TPP), meso-tetrakis(2,3,4,5,6-pentafluorophenyl)porphyrin, and 5,10,15,20-tetraphenyl-2,3,7,8,12,13,17,18-octaalkylporphyrins (ORTPP: R is methyl or ethyl). The porphyrin cores of TRP are more or less S(4)-ruffled depending on the bulkiness of the alkyl substituents, while those of ORTPP are highly S(4)-saddled. Three types of axial ligands are examined which have the following characteristics in ligand field theory: they are (i) strong sigma-donating imidazole (HIm), (ii) strong sigma-donating and weak pi-accepting cyanide (CN(-)), and (iii) weak sigma-donating and strong pi-accepting tert-butyl isocyanide ((t)BuNC). In the case of the bis(HIm) complexes, only the isopropyl complex, [Fe(T(i)PrP)(HIm)(2)](+), has shown the less common (d(xz), d(yz))(4)(d(xy))(1) ground state; the other six complexes have exhibited the common (d(xy))(2)(d(xz), d(yz))(3) ground state. When the axial imidazole is replaced by cyanide, even the propyl and cyclopropyl complexes have shown the (d(xz), d(yz))(4)(d(xy))(1) ground state; the TPP and ORTPP complexes have still maintained the common (d(xy))(2)(d(xz), d(yz))(3) ground state. In the case of the bis((t)()BuNC) complexes, all the complexes have shown the (d(xz), d(yz))(4)(d(xy))(1) ground state. However, the contribution of the (d(xz), d(yz))(4)(d(xy))(1) state to the electronic ground state differs from complex to complex; the (d(xz), d(yz))(4)(d(xy))(1) contribution is the largest in [Fe(T(i)PrP)((t)()BuNC)(2)](+) and the smallest in [Fe(OETPPP)((t)BuNC)(2)](+). We have then examined the electronic ground state of low-spin [Fe(OEP)((t)BuNC)(2)](+) and [Fe(ProtoIXMe(2))((t)BuNC)(2)](+); OEP and ProtoIXMe(2) represent 2,3,7,8,12,13,17,18-octaethylporphyrin and protoporphyrin-IX dimethyl ester, respectively. These porphyrins have a(1u) HOMO in contrast to the other seven porphyrins that have a(2u) HOMO. The (13)C NMR and EPR studies have revealed that the contribution of the (d(xz), d(yz))(4)(d(xy))(1) state in these complexes is as small as that in [Fe(OETPP)((t)BuNC)(2)](+). On the basis of these results, we have concluded that the low-spin iron(III) porphyrins that have (i) strong axial ligands, (ii) highly saddle shaped porphyrin rings, (iii) porphyrins with a(1u) HOMO, and (iv) electron withdrawing substituents at the meso positions tend to maintain the common (d(xy))(2)(d(xz), d(yz))(3) ground state.
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Affiliation(s)
- T Ikeue
- Department of Chemistry, Toho University School of Medicine, Omorinishi, Ota-ku, Tokyo 143-8540
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9
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Ikeue T, Ohgo Y, Saitoh T, Nakamura M, Fujii H, Yokoyama M. Spin Distribution in Low-Spin (meso-Tetraalkylporphyrinato)iron(III) Complexes with (dxz,dyz)4(dxy)1 Configuration. Studies by 1H NMR, 13C NMR, and EPR Spectroscopies. J Am Chem Soc 2000. [DOI: 10.1021/ja992219n] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takahisa Ikeue
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
| | - Yoshiki Ohgo
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
| | - Takashi Saitoh
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
| | - Mikio Nakamura
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
| | - Hiroshi Fujii
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
| | - Masataka Yokoyama
- Contribution from the Department of Chemistry, Toho University School of Medicine, Ota-ku, Tokyo 143-8540, Japan, Division of Biomolecular Science, Graduate School of Science, Toho University, Funabashi 274-8510, Japan, Institute for Molecular Science, Okazaki 444-8585, Japan, and Department of Chemistry, Faculty of Science, Chiba University, Chiba 263-8522, Japan
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Kumar Patra A, Mukherjee R. Synthesis and properties of a monomeric and a μ-oxo-bridged dimeric iron(III) complex with a tetradentate pyridine amide in-plane ligand. X-ray structure of [Fe(bpc)Cl(DMF)] [H2bpc=4,5-dichloro-1,2-bis(pyridine-2-carboxamido)benzene]. Polyhedron 1999. [DOI: 10.1016/s0277-5387(98)00436-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Fryzuk MD, Leznoff DB, Ma ESF, Rettig SJ, Young VG. Synthesis, Structure, and Reactivity of Paramagnetic Iron(II) and Iron(III) Amidodiphosphine Complexes. Organometallics 1998. [DOI: 10.1021/om970665i] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael D. Fryzuk
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Daniel B. Leznoff
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Erin S. F. Ma
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Steven J. Rettig
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Victor G. Young
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
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Czarnecki K, Nimri S, Gross Z, Proniewicz LM, Kincaid JR. Direct Resonance Raman Evidence for a Trans Influence on the Ferryl Fragment in Models of Compound I Intermediates of Heme Enzymes. J Am Chem Soc 1996. [DOI: 10.1021/ja952177c] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kazimierz Czarnecki
- Chemistry Department, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry, Israel Institute of Technology, Technion City, Haifa 32000, Israel, and Chemical Physics Division, Department of Chemistry, and Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, R. Ingardena Street 3, 30-060 Krakow, Poland
| | - Shay Nimri
- Chemistry Department, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry, Israel Institute of Technology, Technion City, Haifa 32000, Israel, and Chemical Physics Division, Department of Chemistry, and Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, R. Ingardena Street 3, 30-060 Krakow, Poland
| | - Zeev Gross
- Chemistry Department, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry, Israel Institute of Technology, Technion City, Haifa 32000, Israel, and Chemical Physics Division, Department of Chemistry, and Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, R. Ingardena Street 3, 30-060 Krakow, Poland
| | - Leonard M. Proniewicz
- Chemistry Department, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry, Israel Institute of Technology, Technion City, Haifa 32000, Israel, and Chemical Physics Division, Department of Chemistry, and Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, R. Ingardena Street 3, 30-060 Krakow, Poland
| | - James R. Kincaid
- Chemistry Department, Marquette University, Milwaukee, Wisconsin 53201-1881, Department of Chemistry, Israel Institute of Technology, Technion City, Haifa 32000, Israel, and Chemical Physics Division, Department of Chemistry, and Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, R. Ingardena Street 3, 30-060 Krakow, Poland
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Chaudhury N, Saini G, Verma A. Stereochemical aspects of axial ligation in ferrous iron-porphyrins probed by resonance Raman spectroscopy. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0584-8539(92)80233-m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Temperature- and pH-dependent changes in the coordination sphere of the heme c group in the model peroxidase N alpha-acetyl microperoxidase-8. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)49535-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Verma AL, Chaudhury NK. Resonance Raman studies of the mechanism of photoreduction of iron protoporphyrin-IX dimethyl ester in the presence of axial ligands. JOURNAL OF RAMAN SPECTROSCOPY 1991; 22:427-434. [DOI: 10.1002/jrs.1250220802] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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Fidler V, Ogura T, Sato SI, Aoyagi K, Kitagawa T. Resonance Raman Study on Phot on eduction of Iron–Porphyrins. A Novel Insight into the Ligand-Aided Process. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1991. [DOI: 10.1246/bcsj.64.2315] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Quantitative analysis of magnetic properties of bis(tetrahydrofuran)octaethylporphyrinatoiron(III)perchlorate. a pure S = 32 iron(III) porphyrin. Chem Phys Lett 1986. [DOI: 10.1016/0009-2614(86)85042-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Yoshimura T, Suzuki S, Nakahara A, Iwasaki H, Masuko M, Matsubara T. Identification of heme axial ligands of cytochrome c' from Alcaligenes sp. N.C.I.B. 11015. BIOCHIMICA ET BIOPHYSICA ACTA 1985; 831:267-74. [PMID: 2996606 DOI: 10.1016/0167-4838(85)90106-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The spectral properties of both ferric and ferrous cytochromes c' from Alcaligenes sp. N.C.I.B. 11015 are reported. The EPR spectra at 77 K and the electronic, resonance Raman, CD and MCD spectra at room temperature have been compared with those of the other cytochromes c' and various hemoproteins. In the ferrous form, all the spectral results at physiological pH strongly indicated that the heme iron(II) is in a high-spin state. In the ferric form, the EPR and electronic absorption spectra were markedly dependent upon pH. EPR and electronic spectral results suggested that the ground state of heme iron(III) at physiological pH consists of a quantum mechanical admixture of an intermediate-spin and a high-spin state. Under highly alkaline conditions, identification of the axial ligands of heme iron(III) was attempted by crystal field analysis of the low-spin EPR g values. Upon the addition of sodium dodecyl sulfate to ferric and ferrous cytochrome c', the low-spin type spectra were induced. The heme environment of this low-spin species is also discussed.
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Determination of the zero-field splitting in a spin-admixed (S = 5/2, S = 3/2) iron III porphyrin. Chem Phys Lett 1983. [DOI: 10.1016/0009-2614(83)87442-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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