547-67-1Relevant articles and documents
Morphology control of nickel oxalate by soft chemistry and conversion to nickel oxide for application in photocatalysis
Rakshit, Soumyadipta,Chall, Sayantani,Mati, Soumya Sundar,Roychowdhury, Anirban,Moulik,Bhattacharya, Subhash Chandra
, p. 6106 - 6116 (2013)
The present work provides an effective methodology for controlled room-temperature aqueous synthesis of nickel oxalate (NiOX) nanosheets and nanoflakes in the presence of anion rich self-assembled bilayers of catanionic surfactant comprising of anionic sodium dodecyl sulfate (SDS) and cationic cetyltrimethylammonium bromide (CTAB). Encouragingly alteration of the CTAB/SDS ratio played an extraordinary role to form nanoflakes and nanosheets of NiOX. Our synthetic approach is combined with calcination to produce antiferromagnetic spherical and hexagonal nickel oxide (NiO) nanoparticles (NPs) as the end product. Synthesized nanostructured NiOX and NiO were characterized by X-ray diffraction study (XRD), energy dispersive X-ray spectroscopy (EDS), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). TEM studies illustrated that spherical NiO NPs have an average size around 5-10 nm and that of hexagonal NiO NPs have average width of about 22-27 nm. Temperature and field dependent magnetic properties of spherical and hexagonal NiO nanomaterials (NMs) were measured by using a SQUID magnetometer which revealed canted antiferromagnetic and spin glass nature, respectively. In addition, we report photocatalytic activity of NiO NMs, investigated on the photodegradation of phenol under ambient conditions, and as expected, the NiO having largest surface area showed best catalytic efficiency. This biomimetic catanionic surfactant inspired approach which require only metal ions as reactants have a definite potential towards an alternative, simple way of synthesizing metal oxide NMs.
The kinetics of formation of the nickel monooxalate complex in solution
Nancollas,Sutin
, p. 360 - 364 (1964)
The rate of formation of the monooxalate complex of nicklel(II) both in neutral and in acid solution has been studied by the use of a flow technique. The results are interpreted in terms of the reactions Ni2+ + A2- ?k1dk1f NiA and Ni2+ + HA- ?k2dk2f NiA + H+ where A2- represents the oxalate ion. At 25.0° and ionic strength 0.10 M, k1f = 7.5 × 104 M-1 sec.-1, k2f = 5 × 103 M-1 sec.-1, k1d = 3.6 sec.-1, and k2d = 1.5 × 103 M-1 sec.-1. Studies at various temperatures between 5 and 35° give ΔH1f* = 14 kcal, mole-1, ΔH-2f* = 14 kcal, mole-1, ΔS1f* = 12 cal. deg.-1 mole-1, and ΔS2f* = 7 cal. deg. mole-1. The results are consistent with a model in which the rate-determining step is the elimination of a water molecule from the inner hydration shell of the nickel ion.
Diamine incorporated compounds derived from polymeric nickel(II) fumarates and oxalates: Crystal structure, spectral and thermal properties of [Ni(en)3](O2C{single bond}CH{double bond, long}CH{single bond}CO2)·3H2O and [Ni(en)3](O2C{single bond}CO2)
Padmanabhan,Joseph, James C.,Huang, Xiaoying,Li, Jing
, p. 36 - 44 (2008)
Lewis-base mediated fragmentation of polymeric nickel(II) fumarate and oxalate are attempted using chelating σ-donor diamines like ethylenediamine (en) and 1,3-diaminopropane (dap) in various conditions which yielded [Ni(en)3](fum)·3H2O (1), [Ni(en)3](ox) (2), [Ni(dap)2(fum)] (3) and [Ni(dap)(ox)]·2H2O (4). While 1 and 2 are molecular products each containing octahedral [Ni(en)3]2+ moieties and the anionic dicarboxylate species, 3 and 4 are dap-incorporated polymeric products. The fumarate derivative 1 containing [Ni(en)3]2+ moieties crystallizes in the monoclinic space group C2/c with a = 17.899(4) A?, b = 11.747(2) A?, c = 10.748(2) A?, β = 125.59(3)°, V = 1837.7(6) A?3, Z = 4, while the oxalate analogue 2 is seen to be in the trigonal space group P-31c with a = 8.8770(13) A?, b = 8.8770(13) A?, c = 10.482(2) A?, γ = 120°, V = 715.3(2) A?3, Z = 2. The octahedral [Ni(en)3] units in both 1 and 2 are seen to be strongly H-bonded to the dicarboxylate moieties through the coordinated en units leading to a three-dimensional network. However, in 1 the water molecules also take part in the H-bonding and contribute to the overall 3D structure. In both 1 and 2 the crystal packing is done with the [Ni(en)3]2+ units with absolute configuration Λ(δδδ) and its mirror conformer with Δ configuration in exactly equal numbers. Spectral (IR and UV-Visible) and magnetic measurements were carried out and some of the ligand-field parameters like Dq, B and β were evaluated for all the four compounds. These values suggest the presence of octahedrally coordinated nickel(II) in all the four complexes. Spectral data suggest that 3 has the two chelating dap moieties and the fumarate coordinated in η1 form through both its carboxylate moieties while 4 has one chelating dap and the oxalate moiety coordinated in η4-bis-chelating form. Though both 1 and 2 are made of the same type of [Ni(en)3]2+ units their thermograms give entirely different thermal features; 1 showing three clearly successive and step-wise dissociation of each en unit while 2 having a combined loss of two en units in the first thermal step. The relevant thermodynamic and kinetic parameters like Ea and ΔS also could be evaluated for various thermal steps for the compounds 1-4 using Coats-Redfern equation.
Nickel(II) complexes with 2-hydroxyethyliminodioacetic acid in aqueous solutions of dicarboxylic acids
Kornev,Semenova
, p. 616 - 621 (2012)
The equilibria in binary and ternary systems containing a nickel(II) salt, 2-hydroxyethyliminodi-acetic acid, and dicarboxylates were studied by spectrophotometric and potentiometric methods with NaClO4 as the supporting electrolyte at I = 0.1 and T = 20 ± 2°C. The molar and protic composition and the pH regions of existence of the complexes were determined, the stability constants of complexes containing the same or different ligands were determined. The fractional distribution of the complexes as the function of acidity was elucidated. The experimental data were treated using mathematical models to estimate the possibility of existence of a broad range of complex species in solution and to distinguish the species that are sufficient to take into account for reproducing the experimental results.
Rapid mass production of iron nickel oxalate nanorods for efficient oxygen evolution reaction catalysis
Hu, Huixia,Lei, Xiang,Li, Shumei,Peng, Ruzhen,Wang, Jinliang
, p. 328 - 333 (2021/12/31)
The NiFe layered-double-hydroxide (NiFe-LDH) and the NiFe metal-organic framework (NiFe-MOF) demonstrate the best catalytic activity among NiFe-based materials for the oxygen evolution reaction (OER), which is important for efficient hydrogen production. However, the preparation processes of these materials are usually cumbersome and have a low yield, which eliminates their most critical advantage of being low cost. We propose a method for rapidly and efficiently preparing porous (Ni0.5Fe0.5)C2O4nanorods with an excellent OER catalytic performance. The overpotential of (Ni0.5Fe0.5)C2O4is 266 mV at 20 mA cm?2under alkaline conditions, and the Tafel slope is 54.39 mV dec?1. Furthermore, analysis of the changes in the surface properties of the material before and after catalysis determined that the real active material is (Ni0.5Fe0.5)(OH)x(C2O4)1?x. Using a simple scaled-up experiment, (Ni0.5Fe0.5)C2O4is mass-produced (40 g)viadirect synthesis in 5 min. The composition and performance of the mass-produced sample are analysed under the same conditions, and (Ni0.5Fe0.5)C2O4still has a good catalytic performance and its composition has not changed. The efficient synthesis of (Ni0.5Fe0.5)C2O4nanorods with a porous structure provides a new option for the development of commercial catalysts using non-precious metals.
Very fast crystallisation of MFe2O4 spinel ferrites (M = Co, Mn, Ni, Zn) under low temperature hydrothermal conditions: A time-resolved structural investigation
Dolcet, Paolo,Diodati, Stefano,Zorzi, Federico,Voepel, Pascal,Seitz, Christoph,Smarsly, Bernd M.,Mascotto, Simone,Nestola, Fabrizio,Gross, Silvia
, p. 2257 - 2268 (2018/05/29)
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.
Catalytic ozonation of 2-ethoxy ethyl acetate using mesoporous nickel oxalates
Amutha,Sillanp??, Mika,Lee, Gang-Juan,Lin, Jir-Chi,Yang, Chuan-Kai,Wu, Jerry J.
, p. 88 - 92 (2013/10/22)
In this communication, synthesis of mesoporous nickel oxalate and its catalytic activity in ozonation of 2-ethoxy ethyl acetate (2-EEA) was reported. The mesoporous nickel oxalate was synthesized by simple method without using any template. The XRD and HR
