134761-87-8

Basic information

• Product Name: Cobalt(II) oxalate
• Synonyms: cobalt(2+):oxalate
• CAS NO: 134761-87-8
• Molecular Formula: C₂CoO₄
• Molecular Weight: 0
• Mol File: 134761-87-8.mol
• Article Data: 22

Chemical Properties

• Appearance: /
• CAS DataBase Reference: Cobalt(II) oxalate(CAS DataBase Reference)
• NIST Chemistry Reference: Cobalt(II) oxalate(134761-87-8)
• EPA Substance Registry System: Cobalt(II) oxalate(134761-87-8)

Safety Data

• Hazardous Substances Data: 134761-87-8(Hazardous Substances Data)

Upstream product

• 22541-53-3 cobalt(II) 
• 583-52-8 potassium oxalate 
• 6153-56-6 oxalic acid dihydrate 
• 144-62-7 oxalic acid 
• 10213-10-2 sodium tungstate (VI) dihydrate 
• 5972-72-5 ammonium hydrogen oxalate 

Downstream Products

• 1277-43-6 cobaltocene 
• 1307-96-6 cobalt(II) oxide 
• 7440-48-4 cobalt 
• 82497-97-0 oxalato-bis(3-phenylaminomethylbenzoxazolinone-2)cobalt(II) 

Relevant articles and documents

Preparation and application of cobalt oxide nanostructures as electrode materials for electrochemical supercapacitors

In a reaction between cobalt(ii) and ammonium oxalate in the presence of CTAB or F-127 as surfactant to control the particle size, a cobalt oxalate complex was formed. The precipitate was calcined and the resulting nano cobalt oxide was characterized by Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) methods. The crystalline pure and nano-sized particles had an average size of less than 40 nm. Electrochemical properties were examined by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 351 F g-1 was obtained at a scan rate of 0.85 A g-1 in 2 M of KOH solution for Co3O4@Ni foam electrode (Co3O4@NF). Furthermore, the electrode exhibits excellent cycle life stability, and almost 98.6% of its initial specific capacitance was maintained after 1000 cycle tests.

Improved Redox Reaction of Lithium Polysulfides on the Interfacial Boundary of Polar CoC2O4 as a Polysulfide Catenator for a High-Capacity Lithium-Sulfur Battery

The performance of cobalt oxalate as an electrocatalyst in a lithium-sulfur battery (LSB) is improved owing to the suitable adsorbent properties of sulfur. The adsorption mechanism is elucidated by UV/Vis spectroscopy and surface analysis through X-ray photoelectron spectroscopy. Li2S6 is converted into thiosulfate and polythionate by a catenation reaction on the interfacial boundary of CoC2O4 contacted with carbon. Following this, the active polythionate and short-chained liquid lithium polysulfides (LiPS) bound to the cobalt surface are further reduced as CoC2O4 reduces the overpotential to facilitate the LiPS redox reaction, leading to high specific capacity, lower self-discharge rate, and stable long-term cycling performance.

Very fast crystallisation of MFe2O4 spinel ferrites (M = Co, Mn, Ni, Zn) under low temperature hydrothermal conditions: A time-resolved structural investigation

MFe2O4 spinel ferrites (M = Co, Mn, Ni, Zn) were synthesised through a low-temperature aqueous route combining co-precipitation of oxalates and hydrothermal treatment at 135 °C. With the objective of gaining a deeper understanding of the structural evolution of the compounds to crystalline materials during the synthetic process, samples were prepared within different reaction times, showing in most cases a fully crystalline habit already after short treatment times. The resulting solids were characterised through several state-of-the-art analytical techniques, both on the atomic (XAS) and mesoscopic (XRPD, SAXS) scales. In parallel, temperature-programmed characterisation was carried out to investigate the evolution of the compounds during the heating process.

Co3O4 nanoplates: Synthesis, characterization and study of optical and magnetic properties

The selective synthesis of spinel-type Co3O4 nanostructure with nanoplates morphology was successfully achieved by solid-state thermal decomposition of the [CoII(NH3) 6](C2O4)·4H2O complex at 350 C without employing any solvent, surfactant and complicated equipment. The product was characterized by thermal analysis (TG/DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, UV-visible spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and magnetic measurements. The TEM images show that the product has a plate-like shape with length of 50-200 nm and thickness of 10-20 nm. FT-IR, XRD, EDX and VSM results suggest the as-prepared Co3O4 nanoplates are pure and single-phase with a weak ferromagnetic behavior. The optical spectrum indicated two direct band gaps at 2.18 and 3.55 eV with a blue shift compared with the bulk samples. The plausible pathway for the formation of Co3O 4 nanoplates was also proposed. Under the present reaction conditions, the decomposition of other cobaltammine complexes and CoC 2O4×2H2O led to the Co3O 4 nanoparticles and nanorods, respectively.

CRYSTAL STRUCTURE OF THE ORDERED PHASE OF ZINC OXALATE AND THE STRUCTURE OF ANHYDROUS Fe2+, Co2+, Ni2+, Cu2+, AND Zn2+ OXALATES

Conditions were found for the preparation of ordered phases of Fe2+, Co2+, Ni2+, and Zn2+ oxalates.The powder pattern was used to determine the structure of the ZnC2O4 phase using 62 reflections obtained with λCu Kα radiation and refinement by the full-matrix method of least squares to R = 0.12 (space group P21/n, Z = 2).This structure consist of cation-anion chains connected by Zn-O bonds in a three-dimensional framework.The zinc ion has octahedral coordination and the oxygen atoms differ in the number of their bonds with the cation, leading to inequality in the C-O bond lengths in the C2O42- anion (1.40 and 1.15 Angstroem).The unit cell parameters were found and refined for all the ordered phases.Indexing was carried out for the powder patterns of the disordered isostructural CuC2O4 phases with superpositional structure.

Microstructure effects on the water oxidation activity of Co3O4/porous silica nanocomposites

We investigate the effect of microstructuring on the water oxidation (oxygen evolution) activity of two types of Co3O4/porous silica composites: Co3O4/porous SiO2 core/shell nanoparticles with varying shell thicknesses and surface areas, and Co3O4/mesoporous silica nanocomposites with various surface functionalities. Catalytic tests in the presence of Ru(bpy)32+ as a photosensitizer and S2O82- as a sacrificial electron acceptor show that porous silica shells of up to ～20 nm in thickness lead to increased water oxidation activity. We attribute this effect to either (1) a combination of an effective increase in catalyst active area or consequent higher local concentration of Ru(bpy)32+; (2) a decrease in the permittivity of the medium surrounding the catalyst surface and a consequent increase in the rate of charge transfer; or both. Functionalized Co3O4/mesoporous silica nanocomposites show lower water oxidation activity compared with the parent nonfunctionalized catalyst, likely because of partial pore blocking of the silica support upon surface grafting. A more thorough understanding of the effects of microstructure and permittivity on water oxidation ability will enable the construction of next generation catalysts possessing optimal configuration and better efficiency for water splitting. (Graph Presented).

Site Selective and Quantitative C-N Bond Cleavage of Spermine on a Cobalt Complex

A C-N bond of spermine coordinated to cobalt(II) is cleaved through site-selective oxidation to yield 1,5-diazabicyclononane and complexes containing 1,3-diaminopropane in an aqueous solution.

Synthesis and antimicrobial study of 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of amino-functionalized silica-coated cobalt oxide nanostructures as catalyst

In this research a series of pyranopyrazoles were efficiently synthesized via the one-pot four-component reactions of ethyl acetoacetate, hydrazinehydrate, aldehydes and malononitrile in the presence of Co3O4@SiO2-tNH

H3PMo12O40-immobilized chitosan/Co3O4: A novel and recyclable nanocomposite for the synthesis of pyrimidinedione derivatives

An efficient three-component reaction of aromatic aldehydes, 6-aminouracil/6-amino-1,3-dimethyluracil and 4-hydroxycoumarin in the presence of a novel heterogeneous catalyst H3PMo12O40-immobilized Co3O4/su