Isaac MF, Lin Q, Simonis U, Suffian DJ, Wilson DL, Walker FA. Electronic effects in transition metal porphyrins. 7. Synthesis and spectroscopic investigations of a series of octasubstituted porphyrin isomers and their iron(III) complexes. Inorg Chem 2002. [DOI: 10.1021/ic00071a011] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]

Tan H, Simonis U, Shokhirev NV, Walker FA. Substituent Effects on the Choice of the Orbital Preferred for Electron Spin Delocalization in Two Paramagnetic Low-Spin Iron(III) Porphyrins: Mapping the Spin Density Distribution at the Pyrrole Positions by 1H COSY and NOESY Techniques. J Am Chem Soc 2002. [DOI: 10.1021/ja00092a032] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Walker FA, Sigel H, McCormick DB. Spectral properties of mixed-ligand copper(II) complexes and their corresponding binary parent complexes. Inorg Chem 2002. [DOI: 10.1021/ic50117a036] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Simonis U, Dallas JL, Walker FA. ROESY: a technique for establishing the existence of chemical exchange in paramagnetic model hemes with short T1 and T2 relaxation times. Inorg Chem 2002. [DOI: 10.1021/ic00052a004] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Shokhirev NV, Walker FA. Analysis of the Temperature Dependence of the 1H Contact Shifts in Low-Spin Fe(III) Model Hemes and Heme Proteins: Explanation of "Curie" and "Anti-Curie" Behavior within the Same Molecule. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100050a020] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Safo MK, Gupta GP, Watson CT, Simonis U, Walker FA, Scheidt WR. Models of the cytochromes b. Low-spin bis-ligated (porphinato)iron(III) complexes with unusual molecular structures and NMR, EPR, and Moessbauer spectra. J Am Chem Soc 2002. [DOI: 10.1021/ja00044a017] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Carlin RL, Walker FA. Thermodynamics of Coordination to an Unsolvated Position in Vanadyl Acetylacetonate. J Am Chem Soc 2002. [DOI: 10.1021/ja01088a009] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Nasri H, Wang Y, Huynh Boi Hanh, Walker FA, Scheidt WR. Reactions of bis(nitro) (.alpha.,.alpha.,.alpha.,.alpha.-tetrakis(o-pivalamidophenyl)porphinato)ferrate(III) with pyridine and imidazole. EPR and Moessbauer spectra and molecular structures of the mixed-ligand species [Erratum to document cited in CA114:177156]. Inorg Chem 2002. [DOI: 10.1021/ic00024a047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Fujita I, Hanson LK, Walker FA, Fajer J. Models for compounds I of peroxidases: axial ligand effects. J Am Chem Soc 2002. [DOI: 10.1021/ja00348a056] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Hatano K, Safo MK, Walker FA, Scheidt WR. Models of cytochromes b. Attempts to control axial ligand orientation with a "hindered" porphyrin system. Inorg Chem 2002. [DOI: 10.1021/ic00007a041] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]

Safo MK, Walker FA, Raitsimring AM, Walters WP, Dolata DP, Debrunner PG, Scheidt WR. Axial Ligand Orientation in Iron(III) Porphyrinates: Effect of Axial .pi.-Acceptors. Characterization of the Low-Spin Complex [Fe(TPP)(4-CNPy)2]ClO4. J Am Chem Soc 2002. [DOI: 10.1021/ja00096a037] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Walker FA, Balke VL, McDermott GA. Models of the cytochromes b. 2. Effect of unsymmetrical phenyl substitution on pyrrole proton shifts of a series of low-spin (tetraphenylporphinato)iron(III) bis(N-methylimidazole) complexes. J Am Chem Soc 2002. [DOI: 10.1021/ja00370a020] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Wagner MR, Walker FA. Spectroscopic study of 1:1 copper(II) complexes with Schiff base ligands derived from salicylaldehyde and L-histidine and its analogs. Inorg Chem 2002. [DOI: 10.1021/ic00163a009] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA, Balke VL, McDermott GA. Electronic effects in transition-metal porphyrins. 4. Effect of unsymmetrical phenyl substitution on the NMR spectra of a series of metal-free and zinc tetraphenylporphyrins. Inorg Chem 2002. [DOI: 10.1021/ic00139a017] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Nasri H, Wang Y, Huynh Boi Hanh, Walker FA, Scheidt WR. Reactions of bis(nitro)(.alpha.,.alpha.,.alpha.,.alpha.-tetrakis(o-pivalamidophenyl)porphinato)ferrate(III) with pyridine and imidazole. EPR and Moessbauer spectra and molecular structures of the mixed-ligand species. Inorg Chem 2002. [DOI: 10.1021/ic00007a012] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA, Simonis U. Models of the cytochromes b. 8. Two-dimensional nuclear Overhauser and exchange spectroscopy studies of paramagnetic "cavity" type (tetraphenylporphinato)iron(III) complexes of planar ligands. [Erratum to document cited in CA115(22):246370d]. J Am Chem Soc 2002. [DOI: 10.1021/ja00031a088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]

Bobrik MA, Walker FA. Entropy, enthalpy, and side-arm porphyrins. 2. Crystal and molecular structure of a 5-coordinate zinc porphyrin with a four-atom chain attaching the pyridyl ligand to the tetraphenylporphyrin. Inorg Chem 2002. [DOI: 10.1021/ic50213a034] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Mink LM, Polam JR, Christensen KA, Bruck MA, Walker FA. Electronic Effects in Transition Metal Porphyrins. 8. The Effect of Porphyrin Substituents, Axial Ligands, "Steric Crowding", Solvent, and Temperature on the 57Fe Chemical Shifts of a Series of Model Heme Complexes. J Am Chem Soc 2002. [DOI: 10.1021/ja00141a027] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA, Benson M. Entropy, enthalpy, and side arm porphyrins. 1. Thermodynamics of axial ligand competition between 3-picoline and a series of 3-pyridyl ligands covalently attached to zinc tetraphenylporphyrin. J Am Chem Soc 2002. [DOI: 10.1021/ja00537a019] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]

Lin Q, Simonis U, Tipton AR, Norvell CJ, Walker FA. Models of the cytochromes b. 10. Application of proton COSY to delineate the spin density distribution at the pyrrole .beta. positions of unsymmetrically substituted low-spin iron(III) tetraphenylporphyrins. Inorg Chem 2002. [DOI: 10.1021/ic00047a002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Schulz CE, Song H, Lee YJ, Mondal JU, Mohanrao K, Reed CA, Walker FA, Scheidt WR. Metalloporphyrin .pi.-Cation Radicals. Molecular Structure and Spin Coupling in a Vanadyl Octaethylporphyrinate Derivative. An Unexpected Spin Coupling Path. J Am Chem Soc 2002. [DOI: 10.1021/ja00095a023] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA, Sigel H. Observation of cis- and trans-bis(2,2'-bipyridyl)copper(II) by electron spin resonance. Inorg Chem 2002. [DOI: 10.1021/ic50111a063] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA. Models of the cytochromes b. 1. Effect of substituents, axial ligand plane orientation, and possible axial ligand bond strain on the pyrrole proton shifts of a series of low-spin monosubstituted tetraphenylporphinatoiron(III)-bisimidazole complexes. J Am Chem Soc 2002. [DOI: 10.1021/ja00529a066] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]

Walker FA, Bowen J. EPR evidence for hydrogen bond donation to the terminal oxygen of cobalt-oxygen model compounds and cobalt oxymyoglobin. J Am Chem Soc 2002. [DOI: 10.1021/ja00311a067] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]

Astashkin AV, Raitsimring AM, Kennedy AR, Shokhireva TK, Walker FA. Pulsed EPR Characterization of the Low-Spin Iron(III) Porphyrinate Complexes with Phenyl Isocyanide Ligands Having the dxy Orbital Ground State. J Phys Chem A 2001. [DOI: 10.1021/jp013088r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]