Electron-transfer and ligand-addition reactions of (TTP)Mn(NO) and (TTP)Co(NO) in a nonaqueous media

Kelly, S.; Lançon, D.; Kadish, Karl M.

doi:10.1021/ic00178a030

Cited by 34 publications

(37 citation statements)

References 3 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[24] COP behave like corrphycenes [33] and porphycenes, [34] and differ vastly from porphyrins, which usually stabilize cobalt() in the tetrapyrrolic ring system. The observed Co II/III redox potentials in COP are much more positive than those observed previously in tetrapyrrolic ring systems (Ϫ0.07 V/Fc for corrphycene, [33] ϩ0.195 V/Fc for porphycene [34] and ϩ0.30 V/Fc for porphyrins [35] ). Such positive potentials are in agreement with the fact that cyclooctaphyrins destabilize Co III in the corresponding ''tetrapyrrolic'' coordination site of COP.…”

Section: Discussioncontrasting

confidence: 53%

Electrochemical and Spectroelectrochemical Investigations of Mono‐ and Binuclear Cobalt(II) Complexes of “Figure‐Eight” Octapyrrolic Macrocycles

Bley-Escrich¹,

Gisselbrecht²,

Michels

et al. 2004

Eur J Inorg Chem

View full text Add to dashboard Cite

In this paper, electrochemical investigations of a set of three cyclooctaphyrin complexes containing divalent cobalt are reported. These complexes are the homodinuclear cobalt-cobalt complex Co 2 L 1 with the ligand H 4 L 1 , the mononuclear cobalt complex CoH 2 L 2 and the heterodinuclear copper(II)-cobalt complex CoCuL 2 with the ligand H 4 L 2 . All of these species undergo two reduction and three oxidation processes, all of which are reversible one-electron transfers. The two reduction and first two oxidation steps are ligand-centered, as confirmed by spectroelectrochemical investigations. In contrast, the third oxidation corresponds to a metal-cent-

show abstract

Section: Discussioncontrasting

confidence: 53%

Electrochemical and Spectroelectrochemical Investigations of Mono‐ and Binuclear Cobalt(II) Complexes of “Figure‐Eight” Octapyrrolic Macrocycles

Bley-Escrich¹,

Gisselbrecht²,

Michels

et al. 2004

Eur J Inorg Chem

View full text Add to dashboard Cite

show abstract

“…The reduction pathways remained unaffected at lower pH. Due to poor affinity of the Co 2+ in [Co(OBTTAP)] the coordination of the solvent or OH À is not involved in the case of the cobalt(II) complex [58,59]. Thus the electrode processes could be summarized as follows:…”

Section: Cyclic Voltammetry In Non-aqueous Mediummentioning

confidence: 99%

Investigation of the electrochemical behavior of metallo-tetraazaporphyrin modified silver and pyrolytic graphite electrodes in aqueous nitrite solution

Prasad¹,

Kumar²

2005

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…Lan and coworkers have examined the ability of sol-gel encapsulated Mn II Mb to act as an NO sensor under physiological conditions (since it binds NO but not O 2 ) [43]. We, and others, have prepared and characterized several synthetic manganese porphyrins ((por)Mn) that bind NO [44][45][46][47][48][49]. In some cases, synthetic (por)Mn compounds have been shown to electrocatalyze the reduction of NO to hydroxylamine and ammonia [50].…”

Section: Introductionmentioning

confidence: 99%

Crystal structures of manganese- and cobalt-substituted myoglobin in complex with NO and nitrite reveal unusual ligand conformations

Zahran

Chooback

Copeland

et al. 2008

Journal of Inorganic Biochemistry

View full text Add to dashboard Cite

Nitrite is now recognized as a storage pool of bioactive nitric oxide (NO). Hemoglobin (Hb) and myoglobin (Mb) convert, under certain conditions, nitrite to NO. This newly discovered nitrite reductase activity of Hb and Mb provides an attractive alternative to mammalian NO synthesis from the NO synthase pathway that requires dioxygen. We recently reported the X-ray crystal structure of the nitrite adduct of ferric horse heart Mb, and showed that the nitrite ligand binds in an unprecedented O-binding (nitrito) mode to the d(5) ferric center in Mb(III)(ONO) [D.M. Copeland, A. Soares, A.H. West, G.B. Richter-Addo, J. Inorg. Biochem. 100 (2006) 1413-1425]. We also showed that the distal pocket in Mb allows for different conformations of the NO ligand (120 degrees and 144 degrees ) in Mb(II)NO depending on the mode of preparation of the compound. In this article, we report the crystal structures of the nitrite and NO adducts of manganese-substituted hh Mb (a d(4) system) and of the nitrite adduct of cobalt-substituted hh Mb (a d(6) system). We show that the distal His64 residue directs the nitrite ligand towards the rare nitrito O-binding mode in Mn(III)Mb and Co(III)Mb. We also report that the distal pocket residues allow a stabilization of an unprecendented bent MnNO moiety in Mn(II)MbNO. These crystal structural data, when combined with the data for the aquo, methanol, and azide MnMb derivatives, provide information on the role of distal pocket residues in the observed binding modes of nitrite and NO ligands to wild-type and metal-substituted Mb.

show abstract

Electron-transfer and ligand-addition reactions of (TTP)Mn(NO) and (TTP)Co(NO) in a nonaqueous media

Cited by 34 publications

References 3 publications

Electrochemical and Spectroelectrochemical Investigations of Mono‐ and Binuclear Cobalt(II) Complexes of “Figure‐Eight” Octapyrrolic Macrocycles

Electrochemical and Spectroelectrochemical Investigations of Mono‐ and Binuclear Cobalt(II) Complexes of “Figure‐Eight” Octapyrrolic Macrocycles

Investigation of the electrochemical behavior of metallo-tetraazaporphyrin modified silver and pyrolytic graphite electrodes in aqueous nitrite solution

Crystal structures of manganese- and cobalt-substituted myoglobin in complex with NO and nitrite reveal unusual ligand conformations

Contact Info

Product

Resources

About