45986-29-6

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• 22541-53-3 cobalt(II) 
• 16486-11-6 phenylphosphonate 
• 1571-33-1 phenylphosphonate 
• 6147-53-1 cobalt(II) diacetate tetrahydrate 
• 7646-79-9 cobalt(II) chloride 

Relevant academic research and scientific papers

Layered mixed-metal phenylphosphonates, MnxCo1-x(O3PC6H 5)·H2O: Structure and magnetic properties

Mixed metal phenylphosphonates of composition MnxCo1-x(O3PC6H 5)·H2O were prepared with 0≤ x ≤ 1. Atomic absorption, X-ray powder diffraction, and electron paramagnetic resonance measurements indicate that the mixed-metal solid solutions are homogeneous and isostructural with the single-metal-parent compounds over the entire concentration range, with a small, systematic evolution of the a and c in-plane unit cell parameters. The temperature dependence of the magnetic data for the pure Mn2+ (x=1) and pure Co2+ (x=0) samples was fitted by standard 2D Heisenberg and 2D Ising models, respectively, yielding nearest-neighbor exchange interaction energies of J = -2.27±0.02 K for Mn(O3PC6H5)·H2O and J = -2.43±0.05 K for Co(O3PC6H5)·H2O. The magnetic phase diagram, down to 2 K, was constructed over the entire composition range. Both dc and ac magnetic susceptibilities were used to identify the transitions to low temperature, long-range-ordered antiferromagnetic states. In the Mn2+- and Co2+-rich regions, the ordering temperature, TN, decreases relative to the pure materials, as expected for magnetic ion impurity doping. For intermediate values of x, Mn2+-Mn2+ interactions dominate, resulting in a minimum in TN near x = 0.25. A weak negative magnetization was observed for x ≤ 0.25. No evidence of spin glass behavior was observed for any concentration at any temperature.

Hydrothermal synthesis and characterization of a layered cobalt phenylphosphonate, Co(PhPO3)(H2O)

We report the hydrothermal synthesis and characterization of a layered cobalt phenylphosphonate. Unlike most metal phosphonates reported to date, the structure was solved by single crystal X-ray diffraction (SC-XRD). Co(ii) centres are hexa-coordinated by oxygen and the octahedra corner-share into a layer. The layers are capped by phenylphosphonate groups, where the phenyl groups define a hydrophobic bilayer region. The material was also characterized by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and SQUID (superconducting quantum interference device) magnetometry. The material undergoes an antiferromagnetic transition at a relatively low Neel temperature of 4.0 K, while the Curie-Weiss temperature of -76.5 K reflects the low-dimensionality of the magnetic structure. The effective magnetic moment of 5.01 B per Co2+ verifies a high-spin configuration and an octahedral coordination of the metal centres. This layered material was correctly predicted in the literature from powder data, adds to the structural diversity of the cobalt phosphonates, and may be useful as an intercalation or exfoliation compound. The Royal Society of Chemistry 2006.

Direct in situ investigation of milling reactions using combined x-ray diffraction and raman spectroscopy

The combination of two analytical methods including time-resolved in situ X-ray diffraction (XRD) and Raman spectroscopy provides a new opportunity for a detailed analysis of the key mechanisms of milling reactions. To prove the general applicability of our setup, we investigated the mechanochemical synthesis of four archetypical model compounds, ranging from 3D frameworks through layered structures to organic molecular compounds. The reaction mechanism for each model compound could be elucidated. The results clearly show the unique advantage of the combination of XRD and Raman spectroscopy because of the different information content and dynamic range of both individual methods. The specific combination allows to study milling processes comprehensively on the level of the molecular and crystalline structures and thus obtaining reliable data for mechanistic studies.

Selected-control synthesis of metal phosphonate nanoparticles and nanorods

By surfactant-assisted methods, nanoscale Co(O3PC 6H5)·H2O species of different morphologies, namely, nanoparticles and nanorods, have been successfully synthesized and characterized. Upon removal of the organic

Intercalation of ammonia into zinc and cobalt phenylphosphonates

Zn(O3PC6H5)·H2O and Co(O3PC6H5)·H2O can be easily dehydrated to yield structures that are isomorphous with the corresponding monohydrate. The dehydration is reversible since both derivatives quickly reabsorb moisture from the atmosphere. The dehydration reaction leaves an open coordination site on the metal allowing both anhydrous zinc and cobalt phenylphosphonates to intercalate ammonia upon exposure to a flow of ammonia gas, as evidenced by FTIR, elemental analysis, and TGA data. Carbon dioxide, carbon monoxide, oxygen, propylamine, and ethylene were not similarly intercalated. Computer-simulated calculations indicate that intercalation of molecules larger than NH3 result in significant overlap of van der Waals surfaces between the intercalate and the phenyl rings.