Magnetic behavior of spin-crossover iron(III) complexes adsorbed on the surface of silicon dioxide and metal dilution effects on magnetism.
スポンサーリンク
概要
- 論文の詳細を見る
The effects of metal dilution and adsorption on the surface of silicon dioxide on the spin-crossover behavior of [Fe(acpa)<SUB>2</SUB>]PF<SUB>6</SUB>, [Fe(acpa)<SUB>2</SUB>]BPh<SUB>4</SUB>, and [Fe(bzpa)<SUB>2</SUB>]PF<SUB>6</SUB>, which undergo fast spin-state interexchange on the <SUP>57</SUP>Fe Mössbauer timescale have been studied by using <SUP>57</SUP>Fe Mössbauer and EPR spectroscopies, powder X-ray diffraction and magnetic susceptibility, where Hacpa is <I>N</I>-(1-acetyl-2-propylidene)-2-pyridylmethylamine and Hbzpa <I>N</I>-(1-benzoyl-2-propylidene)-2-pyridylmethylamine. Solid solution compounds, [Fe<I><SUB>x</SUB></I>Co<SUB>1−<I>x</I></SUB>(acpa)<SUB>2</SUB>]BPh<SUB>4</SUB>(<I>x</I>=0.035 and 0.074) and [Fe<SUB>0.05</SUB>Co<SUB>0.95</SUB>(bzpa)<SUB>2</SUB>]PF<SUB>6</SUB> exhibit spin-crossover phenomena. No difference in the spin-state interexchange rate is observed between the diluted compound and the corresponding undiluted one as far as the rates are evaluated by Mössbauer spectroscopy. Mössbauer spectra for [Fe<SUB>0.074</SUB>Co<SUB>0.926</SUB>(acpa)<SUB>2</SUB>]PF<SUB>6</SUB> exhibit only a pair of quadrupole doublets assigned to the low-spin state in the temperature range from 78 to 298 K. The spin-state interexchange rates for [Fe(acpa)<SUB>2</SUB>]BPh<SUB>4</SUB> and [Fe(bzpa)<SUB>2</SUB>]PF<SUB>6</SUB> adsorbed on the surface of silicon dioxide become slow compared to those for the corresponding pure complexes and the narrowing of the spin-state transition temperature range is observed. On the contrary no detectable differences in the spin-state interexchange rates are observed between the Mössbauer spectra for [Fe(acpa)<SUB>2</SUB>]PF<SUB>6</SUB> adsorbed on the surface of silicon dioxide and that for the pure complexes. These observations are interpreted in terms of a spin-state transition behavior in these complexes which is affected by the packing state in the solid state, which is dependent on the characteristic structure of the respective complex.
- 公益社団法人 日本化学会の論文
著者
-
Maeda Yonezo
Department Of Chemistry And Physics Graduate School Of Sciences Kyushu University
-
Takashima Yoshimasa
Department Of Chemistry Faculty Of Science Kyushu University
-
Tomokiyo Masahiro
Department of Chemistry, Faculty of Science, Kyushu University
-
Kitazaki Kenji
Department of Chemistry, Faculty of Science, Kyushu University
関連論文
- Preparation of a Carboxylate-binding Mononuclear Iron(II) (-)-Sparteine Complex with Structural Distortion and Its Reaction with Oxidants
- Indications and Limitations of the Wolff-Parkinson-White Syndrome : SYMPOSIUM ON SURGICAL TREATMENT OF ARRHYTHMIAS
- Pressure-Stabilized Low-Spin State for Binuclear Iron(III) Spin-Crossover Compounds
- Valence States and Structure of Mixed-Valence Dinuclear Iron(II,III) Complexes [Fe_2(2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-menthyl-phenol)(L)_2](BF_4)_2
- Effects of the Encapsulation of Alkali Ions into Iron(III) Complexes with a Macrocyclic Ring on Magnetic Properties
- Hysteresis Loops in Dielectric Properties of the Thermochromic Copper(II) Compounds
- Study of Intermolecular Interaction for the Spin-Crossover Iron(II) Compounds
- Thermal and Optical Switching of Iron(III) Complexes
- Characterization of a Fluoride-bridged Mixed-valent Tetrairon(II,II,III,III) Complex
- Crystal Structure and Magnetic Property of Two Novel 1-D Cobalt(II) Assemblies
- Spin-Crossover Behaviors of Iron(III) Compounds with Strong Intermolecular Interactions
- Photo-Induced Spin Transition for an Iron(III) Pyruvic Acid Thiosemicarbazone Compound
- [Co^(phimpy)_2](ClO_4)_2 and [Co^(ipimpy)_2](ClO_4)_2 : New Cobalt(II) Spin Crossover Compounds, and the Role of the Ligand Flexibility in Spin Transition Behavior
- Synthesis and Magnetic Properties of Binuclear Iron (III) Complexes Containing Photoisomerization Ligand
- Structural Change of the IR-Transmitting Tellurite, Gallate and Aluminate Glasses Caused by the ^Co-Gamma Ray Irradiation
- Mossbauer Study on the Electron Transfer Rate Depending on the Intermolecular Interaction in Iron(II,III) Mixed-Valence Complex
- Coloration of Fluorophosphate Glasses Containing Fluorescein Molecules by Heat Treatment or Gamma Ray Irradiation
- Bis(u - oxo)(u - hydroxo)triiron(III) and (u - oxo)(u - hydroxo)diiron(III) Core Complexes with Tripodal Ligands Having a Terminal Carboxylate Group
- Incorporation of Mn^III and Fe^II Complexes into TCNQ Networks : Preparations, Crystal Structures, and Magnetic Properties of [Mn^III(salen)(TCNQ)_0.5][Mn^III(salen)(TCNQ)_0.5(CH_3OH)]-CH_3OH・H_2Oand [Fe^II(CH_3OH)_4(TCNQ)_2]TCNQ2CH_3CN
- Low-Temperature ^Sn-Mossbauer Study of Superconducting Bi_4Sr_Ca_Cu_4Sn_O_ Ceramic (2212 Phase)
- ^Sn-Mossbauer Study on the Normal Lattice Vibration of Superconducting Bi(Pb)_2Sr_2Ca_2Cu_3Sn_O_
- Precipitation of Mayenite in 60CaO・35Al_2O_3・5Fe_2O_3 Glass Annealed at Several Temperatures Below and Above the Glass Transition Temperature
- Abrupt Spin Transitions and LIESST Effects Observed in Fe^ Spin-crossover Complexes with Extended π-Conjugated Schiff-base Ligands Having N_4O_2 Donor Sets
- Structures and Magnetic Properties of Some Fe(III)Complexes with Hexadentate Ligands : in Connection with Spin-Crossover Behavior
- Correlation between Detrapped Valence States and Molecular Packing of Mixed-Valence Dinuclear Iron(II,III) Complexes of a Septadentate Polypyridine Ligand
- Intermolecular Excimer Formation in Dinuclear Metal Complexes
- Valence Delocalization and Crystal Structure of [Fe_3O(pazo)_6(py)_3]・3py: An Example of the Mixed Valence Delocalization between Two Iron Atoms
- Gradual Two-step Spin Crossover Behavior of Binuclear Iron(III) Complex Bridged by trans-1,2-Bis(4-pyridyl)ethylene
- Detrapped Valence State of Iron(II)-Iron(III) Complexes with Carboxylic Acid
- HIGH SPECIFIC ACTIVITY OF ORGANICALLY BOUND TRITIUM IN PINE NEEDLES AND SEARCH FOR ITS CAUSE IN THE ENVIRONMENT
- TRITIUM CONCENTRATIONS IN NATURAL WATERS IN JAPAN BEFORE USE OF A LARGE QUANTITY OF TRITIUM ON ITS FUSION PROGRAM
- Magnetic Properties of Iron(III) Complexes with Photoisomerizable Ligands
- ATMOSPHERIC TRITIUM IN THREE DIFFERENT CHEMICAL FORMS IN FUKUOKA
- The Determinations of Some Metal Ions by Using Hexamminecobalt(III) Chloride and Sodium Thiosulfate as Precipitants
- Production of 53Mn by 52Cr(d, n)Reaction
- Magnetic cross-over in hexa-coordinate iron(II) complexes of several Schiff bases.
- Synthesis and characterization of a chloro-bridged binuclear iron(III) complex.
- Local structure, Tg, and IR transparency of potassium titanate glasses and the local structure of calcium titanate ceramics.
- Structural study of germanate glasses irradiated with .GAMMA.-rays and thermal neutrons.
- The correlation between the bonding properties of ligands and the irradiation effects of gamma-rays on iron compounds.
- Moessbauer emission spectroscopic study of some spin crossover cobalt(II) complexes.
- Physical Characteristic and Molecular Structure of Spin-Crossover Iron(III) Complexes of Monoclinic Form with Hexadentate Ligands Derived from Triethylenetetramine and Salicylaldehyde (Fe(sal2trien))BPh4acetone.
- Studies of iron(II) complexes with several Schiff bases: New examples of 5T2-1A1 equilibrium.
- Magnetic behavior of spin-crossover iron(III) complexes adsorbed on the surface of silicon dioxide and metal dilution effects on magnetism.
- Intercalation compounds of FeOCl. Systematics of amine containing lewis base intercalants.
- Moessbauer spectroscopic study of danalite, Fe4(BeSiO4)3S.
- Moessbauer spectroscopic study of superconducting Y-Ba-Cu(Fe)-O ceramics and gamma-ray irradiation effect.
- Moessbauer studies of the gamma-ray-irradiation effects of 1,10-phenanthroline compounds.
- Moessbauer and DTA studies on the structure of semiconducting sodium vanadate glasses.