The nature of the compound KMn(CN)3

Qureshi, Ashfaq Mahmood; Sharpe, A. G.

doi:10.1016/0022-1902(68)80228-3

Cited by 14 publications

(20 citation statements)

References 5 publications

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“…The ν(CN) stretching mode of [Mn II (CN) 6 ] 4– in PBAs was previously reported to occur in a wavenumber range of <2100 cm –1 with characteristic values around 2055 cm –1 for K 2 Mn[Mn(CN) 6 ]. , The IR spectrum of K 2 Mn[Mn(CN) 6 ]·0.1H 2 O in Figure a exhibits a single ν(CN) band at 2048 cm –1 ( F 1u mode) accompanied by a small shoulder at ∼2023 cm –1 , which is in accord with previous observations . This sharp absorption feature is attributable to Mn II –CN–Mn II , and agrees well with previous reports for this distinctive band. , Antisymmetric stretching vibrations of the main CN stretching band can contribute to the weak shoulder at ∼2023 cm –1 (see also Figure S1 in Supporting Information). These spectral features are also indicative of structural strain originating from symmetry-breaking Jahn–Teller distortion for the low-spin Mn(II) ion .…”

Section: Resultsmentioning

confidence: 80%

“…Mn(NO 3 ) 2 ·4H 2 O and KCN salts were used as purchased from Sigma-Aldrich. K 2 Mn[Mn(CN) 6 ]· n H 2 O was synthesized following a precipitation procedure earlier reported by Qureshi and Sharpe . Briefly, distilled water was deoxygenated through boiling and flushing with nitrogen gas for 1 h. Solutions of 0.25 M Mn(NO 3 ) 2 ·4H 2 O and 1.25 M KCN were then separately prepared using the deoxygenated water.…”

Section: Methodsmentioning

confidence: 99%

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Manganese Hexacyanomanganate as a Positive Electrode for Nonaqueous Li-, Na-, and K-Ion Batteries

et al. 2019

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K2Mn[Mn(CN)6] is synthesized, characterized, and evaluated as possible positive electrode material in nonaqueous Li-, Na-, and K-ion batteries. This compound belongs to the rich and versatile family of hexacyanometallates displaying distinctive structural properties, which makes it interesting for ion insertion purposes. It can be viewed as a perovskite-like compound in which CN-bridged Mn(CN)6 octahedra form an open framework structure with sufficiently large diffusion channels able to accommodate a variety of insertion cations. By means of galvanostatic cycling and cyclic voltammetry tests in nonaqueous alkali metal half-cells, it is demonstrated that this material is able to reversibly host Li+, Na+, and K+ ions via electrochemical insertion/deinsertion within a wide voltage range. The general electrochemical features are similar for all of these three ion insertion chemistries. An in operando X-ray diffraction investigation indicates that the original monoclinic structure is transformed into a cubic one during charging (i.e., removal of cations from the host framework) and that such a process is reversible upon subsequent cell discharge and cation reuptake.

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Section: Resultsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Manganese Hexacyanomanganate as a Positive Electrode for Nonaqueous Li-, Na-, and K-Ion Batteries

et al. 2019

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“…Monoclinic Na manganese (II) hexacyanomanganate (II) MnHCMn was prepared by a co-precipitation method adapted from the literature 34 . An aqueous solution of Mn(NO 3 ) 2 Á 4H 2 O (0.25 M) was added to an aqueous solution of NaCN (1.28 M) in the presence of an excess of NaCl (50:1 mol:mol) in a dark container within a N 2 -filled glovebox.…”

Section: Methodsmentioning

confidence: 99%

Manganese hexacyanomanganate open framework as a high-capacity positive electrode material for sodium-ion batteries

et al. 2014

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Potential applications of sodium-ion batteries in grid-scale energy storage, portable electronics and electric vehicles have revitalized research interest in these batteries. However, the performance of sodium-ion electrode materials has not been competitive with that of lithium-ion electrode materials. Here we present sodium manganese hexacyanomanganate (Na 2 Mn II [Mn II (CN) 6 ]), an open-framework crystal structure material, as a viable positive electrode for sodium-ion batteries. We demonstrate a high discharge capacity of 209 mAh g À 1 at C/5 (40 mA g À 1 ) and excellent capacity retention at high rates in a propylene carbonate electrolyte. We provide chemical and structural evidence for the unprecedented storage of 50% more sodium cations than previously thought possible during electrochemical cycling. These results represent a step forward in the development of sodium-ion batteries.

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“…In addition to the well-studied fcc PBAs that magnetically order, several non-fcc PBAs structured magnets have been recently structurally characterized. K 2 Mn[Mn(CN) 6 ] was initially reported in 1968 184 to have a typical PBA fcc structure (a = 10.15 A ˚). 185 However, upon revisiting this material, and studying Rb 2 Mn[Mn(CN) 6 ], they both were determined to have a monoclinic unit cell via the Rietveld refinement of synchrotron powder X-ray diffraction data.…”

Section: Nitroxide-based Magnetsmentioning

confidence: 99%

Magnetically ordered molecule-based materials

2011

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Magnets composed of molecular components that provide both electron spins and spin-coupling pathways can stabilize bulk magnetic ordering. This was first reported for the ionic, zero-dimensional (0-D) electron transfer salt [Fe(C(5)Me(5))(2)](+)[TCNE]˙(-) (TCNE = tetracyanoethylene), which orders as a ferromagnet at T(c) = 4.8 K. Later V[TCNE](x) (x ∼ 2) was characterized to order above room temperature at 400 K (127 °C). Subsequently, numerous examples of organic- and molecule-based magnets have been characterized. In this critical review, after a discussion of the important aspects of magnetism pertaining to molecule-based magnets, including the determination of the magnetic ordering temperature (T(c)) these magnetically ordered materials are reviewed from a perspective of the structural dimensionality (208 references).

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The nature of the compound KMn(CN)3

Cited by 14 publications

References 5 publications

Manganese Hexacyanomanganate as a Positive Electrode for Nonaqueous Li-, Na-, and K-Ion Batteries

Manganese Hexacyanomanganate as a Positive Electrode for Nonaqueous Li-, Na-, and K-Ion Batteries

Manganese hexacyanomanganate open framework as a high-capacity positive electrode material for sodium-ion batteries

Magnetically ordered molecule-based materials

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