Abstract：
:Two new diMn(III) complexes [Mn(2)(III)L(1)(mu-AcO)(mu-MeO)(methanol)(2)]Br (1) and [Mn(2)(III)L(2)(mu-AcO)(mu-MeO)(methanol)(ClO(4))] (2) (L(1)H(3)=1,5-bis(2-hydroxybenzophenylideneamino)pentan-3-ol; L(2)H(3)=1,5-bis(2-hydroxynaphtylideneamino)pentan-3-ol) were synthesized and structurally characterized. Structural studies evidence that these complexes have a bis(mu-alkoxo)(mu-carboxylato) triply bridged diMn(III) core in the solid state and in solution, with two substitution-labile sites--one on each Mn ion--in cis-position. The two complexes show catalytic activity toward disproportionation of H(2)O(2), with saturation kinetics on [H(2)O(2)], in methanol and dimethyl formamide at 25 degrees C. Spectroscopic monitoring of the H(2)O(2) disproportionation reaction suggests that (i) complexes 1 and 2 dismutate H(2)O(2) by a mechanism involving redox cycling between Mn(2)(III) and Mn(2)(IV), (ii) the complexes retain the dinuclearity during catalysis, (iii) the active form of the catalyst contains bound acetate, and (iv) protons favors the formation of inactive Mn(II) species. Comparison to other dimanganese complexes of the same family shows that the rate of catalase reaction is not critically dependent on the redox potential of the catalyst, that substitution of phenolate by naphtolate in the Schiff base ligand favors formation of the catalyst-substrate adduct, and that, in the non-protic solvent, the bulkier substituent at the imine proton position hampers the binding to the substrate.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Biava H,Palopoli C,Shova S,De Gaudio M,Daier V,González-Sierra M,Tuchagues JP,Signorella Sdoi
10.1016/j.jinorgbio.2006.05.016subject
Has Abstractpub_date
2006-10-01 00:00:00pages
1660-71issue
10eissn
0162-0134issn
1873-3344pii
S0162-0134(06)00167-Xjournal_volume
100pub_type
杂志文章abstract：:The new cyclic tetrapeptide c(HGHK) was synthesised in the solid phase and its complexes with copper(II) were studied in aqueous solution at various pH values by means of potentiometric and spectroscopic methods (UV, EPR, CD). Six mononuclear coordination species were clearly identified within the pH range 3-11. Spect...
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abstract：:The action mechanism of vanadocene dichloride, Cp2VCl2 (Cp=eta5-C5H5), has been investigated by interaction with human serum transferrin for its promising antitumor activities. Our results have shown that Cp2VCl2 binds to transferrin and form a new complex, and the calculated apparent association constant is 1.37 x 10...
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pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
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pub_type： 杂志文章
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pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章,评审
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2009.03.001
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2005.05.017
更新日期：2005-09-01 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/s0162-0134(02)00471-3
更新日期：2002-08-30 00:00:00
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journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2004.08.008
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pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2006.01.011
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abstract：:Ternary systems of copper(II) complexes with phosphoserine and adenosine 5'-monophosphate or adenosine 5'-diphosphate or adenosine 5'-triphosphate have been investigated. The studies have been performed in aqueous solution using the potentiometric method with computer analysis of the data, (13)C and (31)P nuclear magn...
journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
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pub_type： 杂志文章
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journal_title：Journal of inorganic biochemistry
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journal_title：Journal of inorganic biochemistry
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abstract：:Amphetamine-based (Amph) drugs are metabolized in humans to their hydroxylamine (AmphNHOH) and nitroso (AmphNO) derivatives. The latter metabolites are known to bind to the Fe centers of cytochrome P450 and other heme enzymes to inhibit their activities. Although these AmphNHOH/AmphNO metabolites are present in vivo, ...
journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
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更新日期：2020-12-01 00:00:00
abstract：:Ferredoxin:NADP(+) oxidoreductase (FNR) was treated with cadmium and after that its diaphorase reaction in the presence of dibromothymoquinone (DBMIB) or ferricyanide (FeCy, K(3)Fe(CN)(6)) was examined. CdSO(4) (5 mM) caused 50% inhibition after half hour incubation. At least two components were distinguishable in the...
journal_title：Journal of inorganic biochemistry
pub_type： 杂志文章
doi：10.1016/j.jinorgbio.2004.04.004
更新日期：2004-08-01 00:00:00
