Transition-metal complexes of pyrrole pigments. XIII. Reduction and coordination behaviors of the cobalt(II) complexes of 1,19-disubstituted tetradehydrocorrins as demonstrated by the presence of various bases.
スポンサーリンク
概要
- 論文の詳細を見る
The interaction of various bases with the cobalt(II) complexes of 1,19-disubstituted tetradehydrocorrins (Co(II)–TDHC) was investigated. The parent cobalt(II) complexes were shown to undergo ready reduction at the nuclear cobalt(II) with the unsolvated hydroxide ion as well as with bulky triethylamine. A relatively large positive reduction potential of Co(II)–TDHC is responsible for these novel electron transfer reactions. Less hindered amines (B), on the other hand, failed to show such electron transfer reactions with the cobalt(II) complexes and Co(II)–TDHC became the pentacoordinated complex by taking up an amine base in the axial position: Co(II)–TDHC+B\rightleftharpoonsB–Co(II)–TDHC. For the interaction of 4-substituted pyridines with the cobalt(II) complex, the general behavior of the equilibrium constants was interpreted in terms of the amine basicity and the Hammett equation by referring to the corresponding behavior of the porphyrin complexes. The weaker coordination tendency of some aliphatic amines and hindered pyridines toward Co(II)–TDHC was attributed to their electronic and steric effects in the coordination process. The intrinsic correlation between electronic and stereochemical characteristics pertaining to the tetradehydrocorrin skeleton and the nature of nuclear cobalt(II) was discussed on the basis of these observations.
- 公益社団法人 日本化学会の論文
著者
-
Murakami Yukito
Department Of Chemical Science And Technology Faculty Of Engineering Kyushu University
-
Aoyama Yasuhiro
Department Of Chemistry Nagaoka University Of Technology
-
Aoyama Yasuhiro
Department of Organic Synthesis, Faculty of Engineering, Kyushu University
関連論文
- Preparation and Characterization of Novel Cage-type Cyclophanes Having Three or Four Bridging Dipeptide Segments
- Catalytic Performance of a Supramolecular Bienzyme Complex Formed with Artificial Aminotransferase and Natural Lactate Dehydrogenase
- Stereoselective Synthesis of β-Phenylserine from Glycine and Benzaldehyde as Mediated by Catalytic Bilayer Membranes, Artificial Vitamin B_6-dependent Enzymes
- pH-Responsive Molecular Recognition by a Water-soluble Cyclophane Bearing L-Aspartate Moieties
- Photolysis of Hydrophobic Vitamin B_ Derivatives Covalently Bound to Lipid in Aqueous Media
- Enantioselective Alkylation of Hydrophobic Vitamin B_ Bearing Binaphthyl Moiety
- Discrimination of Steroid Hormones by Novel Cage-type Azacyclophanes Bearing Chiral Binding Sites
- β-Replacement Reaction in an Asymmetric Site Provided by an Artificial Enzyme Composed of a Hydrophobic Vitamin B_6 and Peptide Lipids
- Enantioselective β-Replacement Reaction Mediated by an Artificial Enzyme Composed of a Hydrophobic Vitamin B_6, Chiral Bilayer-forming Lipids, and Copper(II) Ions
- Synthetic Cationic Amphiphile for Liposome-Mediated DNA Transfection with Less Cytotoxicity
- Primary carcinoid tumor in a horseshoe kidney
- Promotion of Reductive Elimination Reaction of Diorgano (2, 2' -bipyridyl) nickel (II) Complexes by Electron-Accepting Aromatic Compounds, Lewis Acids, and Bronsted Acids
- Control of Reductive Elimination and Acidolysis of Diarylnickel(II) Complexes by the Kind of Bronsted Acid and the Presence of Oxygen
- Turn-on Detection of Targeted Biochemical Reactions by Triple Resonance NMR Analysis Using Isotope-labeled Probe
- Preparation of Porphyrins Having Phenylboronic Acid Groups
- Over-activation of cAMP signaling increases vulnerability to hydrogen peroxide via actin rearrangement, which is inhibited by prostaglandin E2 in a mouse granulosa cell line.
- Artificial Metallonuclease. Cu^-Promoted DNA Strand Scission as Effected by Bisresorcinol Derivatives Having a Metal-Ion Binding Site
- Selective 3-0-and/or 6-0-Glycosidation of Unprotected O and S-Glycosides Promoted by an Intramolecularly Coordinated Arylboronic Compound
- Effort toward Ribosome-Catalyzed Synthesis of Structurally-Diverse Peptidomimetic Libraries : Expansion of Unnatural Substrates Acceptable by the E. coli Ribosome
- グリコウイルス
- Tuning the Hoechst Dye into Color-changing Fluorescent pH Indicator in an Acidic Range
- Structure and Function of Molecular Assembly : A Personal Reminiscence
- Inhibitor-substituted Boron-dipyrromethene as a Turn-on Fluorescence Probe for Enzymes
- Aggregation behavior of amphiphiles functionalized with dipeptide segments and enantioselective ester hydrolysis in their bilayer membranes.
- Copper(II)-catalyzed transamination between pyruvate and hydrophobic pyridoxamine embedded in synthetic bilayer membranes.
- Catalytic efficiency of functionalized vesicles in the transamination of pyridoxal-5'-phosphate with a hydrophobic amino acid.
- Macrocyclic enzyme model system. Kinetic activity of (20)paracyclophane bearing 1,4-dihydronicotinamide and 2-pyridinecarboxylic acid moieties as effected by zinc ion.
- Functionalized bilayer membranes as artificial tryptophan synthase. Characterization of catalytic efficiency, substrate specificity, and reaction selectivity.
- Transition-metal complexes of pyrrole pigments. XIX. Electrochemical and coordination behaviors of (5,10,15,20-tetraphenylporphinato)niobium(V) complexes.
- A macrocyclic enzyme model system. An electrostatic-hydrophobic double-field catalysis by a [20]paracyclophane in the deacylation of p-nitrophenyl hexadecanoate.
- Abnormal Benzo Substituent Effect on Free Radical Formation Process. A Local Symmetry Effect
- Transition-metal complexes of pyrrole pigments. XVII. Preparation and spectroscopic properties of corrole complexes.
- Transition-metal complexes of pyrrole pigments. XXI. One-electron oxidation of water mediated by a cobalt(III)-tetradehydrocorrin complex.
- Syntheses of Organic Phosphates. II. 3-Hydroxy-2-pyridylmethyl, 6-Methyl-2-pyridylmethyl, 3-Pyridyl and 8-Quinolyl Phosphate
- Substrate selectivity of artificial transaminase constituted with functionalized bilayer membrane.
- Aggregate morphology of peptide lipids having hydroxyl groups : Molecular basis for formation of inverted hexagonal, inverted cubic, bilayer, and micellar phases.
- Catalytic efficiency of cationic micellar catalysts bearing a mercapto group as the reaction center.
- Hydrophobic vitamin B12. III. Incorporation of hydrophobic vitamin B12 derivatives into single-compartment vesicles and their alkylation in various molecular aggregates.
- Hydrophobic vitamin B12. V Electrochemical carbon-skeleton rearrangement as catalyzed by hydrophobic vitamin B12 : Reaction mechanisms and migratory aptitude of functional groups.
- Catalytic Functions of Artificial Enzyme Composed of Simple Vitamin B12 Model and Synthetic Bilayer Membrane.
- Hydrophobic vitamin B12. II. Coordination geometry and redox behavior of heptamethyl cobyrinate in nonaqueous media.
- Macrocyclic enzyme model systems. Catalytic activity of cyclic peptides involving hydrophobic segments.
- Transformation between lamellar and nonlamellar aggregates formed with synthetic peptide lipids.
- Aggregate morphology and hydrogenation reactivity of functionalized bilayer membrane composed of peptide lipid having NADH activity.
- Fusogenic behavior of single-walled vesicles composed of synthetic peptide lipids.
- Hydrophobic vitamin B12. I. Preparation and axial ligation behavior of hydrophobic vitamin B12r.
- Transition-metal Complexes of Pyrrole Pigments. X. Divalent and Trivalent Manganese Chelates of Dipyrromethenes
- Transition-metal Complexes of Pyrrole Pigments. III. Copper(II) and Zinc(II) Complexes of 1,19-Dideoxy-8,12-dicarbethoxy-1,3,7,13,17,19-hexamethylbiladiene-ac
- Solvolysis of Organic Phosphates. VIII. γ-Elimination in the Spontaneous Hydrolysis of 2-Chloro-3-pyridylmethyl Phosphate
- Solvolysis of Organic Phosphates. IV. 3-Pyridyl and 8-Quinoly Phosphates as Effected by the Presence of Metal Ions
- Transition-metal complexes of pyrrole pigments. XII. Optical and magnetic resonance spectra of the cobalt(II) and nickel(II) complexes of 1,19-disubstituted tetradehydrocorrins.
- Transition-metal complexes of pyrrole pigments. XIII. Reduction and coordination behaviors of the cobalt(II) complexes of 1,19-disubstituted tetradehydrocorrins as demonstrated by the presence of various bases.