Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn–Teller effect of Fe2+ ion

  title={Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn–Teller effect of Fe2+ ion},
  author={Takuya Echigo and Mitsuyoshi Kimata},
  journal={Physics and Chemistry of Minerals},
  • T. Echigo, M. Kimata
  • Published 7 May 2008
  • Chemistry, Materials Science
  • Physics and Chemistry of Minerals
The single-crystal of humboldtine [Fe2+(C2O4) · 2H2O] was first synthesized and the crystal structure has been refined. Single-crystal X-ray diffraction data were collected using an imaging-plate diffractometer system and graphite-monochromatized MoKα radiation. The crystal structure of humboldtine was refined to an agreement index (R1) of 3.22% calculated for 595 unique observed reflections. The mineral crystallizes in the monoclinic system, space group C2/c, with unit cell dimensions of a… 
Solvothermal Synthesis of LiMn1–xFexPO4 Cathode Materials: A Study of Reaction Mechanisms by Time-Resolved in Situ Synchrotron X-ray Diffraction
We applied time-resolved in situ synchrotron X-ray diffraction (XRD) to study the reaction processes and pathways during the solvothermal synthesis of the olivine-structured LiFePO4, LiMnPO4, and
Iron(II)oxalate Dihydrate—Humboldtine: Synthesis, Spectroscopic and Structural Properties of a Versatile Precursor for High Pressure Research
Iron(II)oxalate dihydrate FeC2O4 × 2 H2O—humboldtine is not only an important synthetic intermediate, but also a key building block for the preparation of various advanced materials. Interestingly,
Crystal chemistry of organic minerals – salts of organic acids: the synthetic approach
ABSTRACT The term ‘organic minerals’ means naturally occurring crystalline organic compounds including metal salts of formic, acetic, citric, mellitic, methanesulfonic and oxalic acids. As for the
Magnetic properties of a family of quinternary oxalates
We report on the magnetic properties of four isomorphous compounds of a family of quinternary oxalates down to 60 mK. In all these materials, the magnetic FeII ions with a strong magneto-crystalline
Intrinsic and extrinsic proton conductivity in metal-organic frameworks
Metal-organic frameworks (MOFs), a new class of solid-state materials, have recently been investigated as proton conductors, but little is known about their mechanisms. Since most of the
Recent advances in crystal chemistry and isotope geochemistry of organic minerals: Contribution of oxalate and polycyclic aromatic hydrocarbon minerals to new developments in mineralogy
Organic minerals are natural organic compounds with both well-defined chemical composition and crystallographic properties; their occurrences show traces of the high concentration of certain organic
Review: Natural oxalates and their analogous synthetic complexes
Metal oxalates, commonly classified as organic minerals, are widely distributed in Nature, occurring in mineral deposits or as biominerals in plants, fungi, and lichens or in the form of deposits, of


Magnetic ordering of the linear chain system manganese oxalate dihydrate investigated by means of neutron diffraction and bulk magnetic measurements
Neutron diffraction experiments were carried out in the temperature range from 1.5 to 295 K on a polycrystalline sample of manganese(II) oxalate dihydrate MnC2O4.2D2O, a system composed of linear
The monoclinic polymorph of catena -poly[[diaquamanganese(II)]-μ-oxalato-κ 4 O 1 , O 2 : O 1′ , O 2′ ]
The present single-crystal X-ray study deals with the monoclinic polymorph, which is isostructural with the CoII analogue.
Fautes d'empilement dans les oxalates dihydratés des métaux divalents de la série mangésienne (Mg,Fe,Co,Ni,Zn,Mn)
The dihydrated oxalates of the magnesium series (Mg, Mn, Fe, Co, Ni, Zn) may exist either as a three-dimensional ordered phase, isostructural with humboldtine, or as a disordered phase with stacking
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations. Revisions are based on new structural data,
Lindbergite, a new Mn oxalate dihydrate from Boca Rica mine, Galiléia, Minas Gerais, Brazil, and other occurrences
Abstract The new mineral lindbergite, Mn(C2O4)·2H2O, is a secondary mineral in the Lavra da Boca Rica granite pegmatite, Sapucaia do Norte, Galiléia Co., Minas Gerais, Brazil. It occurs as: (1) white
Vibrational spectra of halides and complex halides. Part IV. Some tetrahalogenothallates and the effects of d-electronic structure on the frequencies of hexachlorometallates
Vibrational spectra of the ions [MCl6]2–(M = Cr, Mn, Fe, In, or lr) and [MCl6]3–(M = Mn or Ce) are assigned. The ν3 values show the effect of the differences in electronic structure of the metal