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Journal articles on the topic 'Cobalt acetate'

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Published: 4 June 2021

Last updated: 20 February 2023

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1

Goswami, Partha P., Hanif A. Choudhury, Sankar Chakma, and Vijayanand S. Moholkar. "Sonochemical Synthesis of Cobalt Ferrite Nanoparticles." International Journal of Chemical Engineering 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/934234.

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Cobalt ferrite being a hard magnetic material with high coercivity and moderate magnetization has found wide-spread applications. In this paper, we have reported the sonochemical synthesis of cobalt ferrite nanoparticles using metal acetate precursors. The ferrite synthesis occurs in three steps (hydrolysis of acetates, oxidation of hydroxides, and in situ microcalcination of metal oxides) that are facilitated by physical and chemical effects of cavitation bubbles. The physical and magnetic properties of the ferrite nano-particles thus synthesized have been found to be comparable with those reported in the literature using other synthesis techniques.

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2

Yang, Xia, and Hui Ping Shao. "Synthesis and Characterization of Cobalt Nanoparticles by Cobalt-Acetate." Advanced Materials Research 503-504 (April 2012): 346–49. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.346.

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In this study, cobalt nanoparticles with an average size of 16 nm were synthesized using cobalt-acetate as precursor. Besides oleylamine and oleic acid, sodium oleate was selected as surfactants to control the size of particles. The obtained particles show cubic shape and uniformly disperse. The hysteresis curve of cubic nanoparticles detected by vibrating sample magnetometer (VSM) reveals that the coercive force Hc is 297.62 Oe and the saturation magnetization Ms is 56.55 emu/g.

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3

Beattie, James K., Corina U. Beck, Peter A. Lay, and Anthony F. Masters. "Chemistry of Cobalt Acetate. 7. Electrochemical Oxidation of μ3-Oxo-Centered Cobalt(III) Acetate Trimers." Inorganic Chemistry 42, no. 25 (December 2003): 8366–70. http://dx.doi.org/10.1021/ic0345525.

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4

Liang, Zhen-Hua, Ying-Jie Zhu, Guo-Feng Cheng, and Yue-Hong Huang. "Microwave-assisted synthesis of β-Co(OH)2 and Co3O4 nanosheets via a layered precursor conversion method." Canadian Journal of Chemistry 84, no. 8 (August 1, 2006): 1050–53. http://dx.doi.org/10.1139/v06-134.

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Single crystalline β-Co(OH)2 nanosheets have been synthesized from a layered precursor cobalt(II) acetate hydroxide by microwave heating. The average thickness of β-Co(OH)2 nanosheets is ~10 nm, with particle sizes up to 360 nm. The layered precursor was prepared using Co(CH3COO)2·4H2O, ethylene glycol, and H2O in some cases by microwave heating. Co3O4 nanosheets have been synthesized by hydrothermal oxidation of the layered precursor cobalt(II) acetate hydroxide using H2O2.Key words: nanosheets, microwave, cobalt hydroxide, cobalt oxide.

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5

Kamal, S. S. Kalyan, A. Pavan Kumar, J. Vimala, N. V. Rama Rao, B. Majumdar, P. Ghosal, and L. Durai. "In situ synthesis of cobalt and cobalt carbide nanostructures using decomposition of cobalt acetate." Journal of Alloys and Compounds 748 (June 2018): 814–17. http://dx.doi.org/10.1016/j.jallcom.2018.03.194.

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6

Mehrbod, Mohammad, Michela Martinelli, Caleb D. Watson, Donald C. Cronauer, A. Jeremy Kropf, and Gary Jacobs. "Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors." Reactions 2, no. 2 (June 1, 2021): 129–60. http://dx.doi.org/10.3390/reactions2020011.

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Different low-cost cobalt precursors (acetate, chloride) and thermal treatments (air calcination/H2 reduction versus direct H2-activation) were investigated to alter the interaction between cobalt and silica. H2-activated catalysts prepared from cobalt chloride had large Co0 particles (XRD, chemisorption) formed by weak interactions between cobalt chloride and silica (temperature programmed reduction (TPR), TPR with mass spectrometry (TPR-MS), TPR with extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge spectroscopy (XANES) techniques) and retained Cl-blocked active sites, resulting in poor activity. In contrast, unpromoted Co/SiO2 catalysts derived from cobalt acetate had strong interactions between Co species and silica (TPR/TPR-MS, TPR-EXAFS/XANES); adding Pt increased the extent of the Co reduction. For these Pt-promoted catalysts, the reduction of uncalcined catalysts was faster, resulting in larger Co0 clusters (19.5 nm) in comparison with the air-calcined/H2-activated catalyst (7.8 nm). Both catalysts had CO conversions 25% higher than that of the Pt-promoted catalyst prepared in the traditional manner (air calcination/H2 reduction using cobalt nitrate) and three times higher than that of the traditional unpromoted Co/silica catalyst. The retention of residual cobalt carbide (observed in XANES) from cobalt acetate decomposition impacted performance, resulting in a higher C1–C4 selectivity (32.2% for air-calcined and 38.7% for uncalcined) than that of traditional catalysts (17.5–18.6%). The residual carbide also lowered the α-value and olefin/paraffin ratio. Future work will focus on improving selectivity through oxidation–reduction cycles.

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7

BLAKE, A. B., J. R. CHIPPERFIELD, S. LAU, and D. E. WEBSTER. "ChemInform Abstract: Nature of Cobalt(III) Acetate." ChemInform 22, no. 11 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199111274.

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8

Morimoto, Takashi, Masao Hirano, Takashi Enokida, Akihito Isomoto, Takayoshi Hamaguchi, and Xumin Zhung. "Oxidation by cobalt(III) acetate. Part 11. Oxidation of conjugated dienes by cobalt(III) acetate in acetic acid." Journal of the Chemical Society, Perkin Transactions 2, no. 8 (1988): 1531. http://dx.doi.org/10.1039/p29880001531.

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9

Hirano, Masao, Tadamichi Ishii, and Takashi Morimoto. "Oxidation by Cobalt(III) Acetate. Part 13. Oxidation of Substituted Phenols with Cobalt(III) Acetate in Acetic Acid." Bulletin of the Chemical Society of Japan 64, no. 4 (April 1991): 1434–36. http://dx.doi.org/10.1246/bcsj.64.1434.

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10

Bao, Wenya, Xiaofen Fu, Kaiqi Hu, and Yecong Zhao. "Adsorption and Photo-catalytic Properties of Congo Red by Cobalt Doped Porous ZnO Prepared Through Hydrothermal Method." E3S Web of Conferences 185 (2020): 04048. http://dx.doi.org/10.1051/e3sconf/202018504048.

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ZnO and cobalt doped ZnO were prepared by hydrothermal method with zinc acetate dihydrate, cobalt acetate tetrahydrate and urea as raw materials and sodium citrate as surface modifier. Congo red (CR) was used as the pollutant model for adsorption and photo-catalytic experiments. Under the same conditions, the adsorption effect of cobalt doped ZnO with different urea content on CR was investigated, and the optimum urea content was determined. Under the same conditions, the adsorption and photocatalytic properties of cobalt doped ZnO prepared with the best urea content at different annealing temperatures were studied. According to the analysis of experimental data, the adsorption effect of Co doped ZnO with urea content of 8mmol and annealing temperature of 300℃ is the best, and the photocatalytic effect is also the best under the same conditions.

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11

DiDonato, G. C., and K. L. Busch. "A reinvestigation of the mass spectra of zinc acetate and cobalt acetate." Inorganic Chemistry 25, no. 10 (May 1986): 1551–56. http://dx.doi.org/10.1021/ic00230a009.

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12

Liu, Wei, Yong Xie, Qiang Xie, Kexiong Fang, Xuan Zhang, and Houhe Chen. "In situ synthesis of hydrophobic coatings: an effective strategy to reduce hygroscopicity and catalyze decomposition of ammonium perchlorate." CrystEngComm 21, no. 37 (2019): 5633–40. http://dx.doi.org/10.1039/c9ce00566h.

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An in situ reaction of stearic acid with copper acetate or cobalt acetate was adopted to prepare hydrophobic coatings, which effectively reduced the hygroscopicity and accelerated the thermal decomposition process of ammonium perchlorate.

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13

Mutto, Juan Cruz, Tabata Prado Sato, João Mauricio Ferraz Da Silva, Alexandre Luiz Souto Borges, and Eduardo Shigueyuki Uemura. "Retentiveness comparison of individual clasps made from polyamide, acetate resin and cobalt-chrome for removable partial dentures." Brazilian Dental Science 22, no. 4 (October 31, 2019): 483–87. http://dx.doi.org/10.14295/bds.2019.v22i4.1802.

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Objective: This study aimed to evaluate and compare the retention force of individual clasps made from polyamide, acetate resin and cobalt-chrome for removable partial dentures. Material and methods: Three groups of clasps were fabricated: Cr-Co - 10 conventional chrome-cobalt metal clasps; Ac - 10 clasps with reciprocal arms and occlusal rests in chrome-cobalt and retentive arms in acetate resin; and Poly - 10 clasps with reciprocal arms and occlusal rests in chrome-cobalt and retentive arms in polyamide resin. Through the tensile test, in a universal testing machine, the initial retention force of the specimens was obtained and then clasps were cycled 7200 times, immersed in artificial saliva (60 months of simulated clinical use). After cycling, tensile test was performed. Results: All groups presented a retention decrease after the cycling. Ac presented a large reduction in retentive force (61.43%), followed by Cr-Co (26.5%) and Poly (12.09%). Conclusions: Aesthetic clasps of polyamide can be used in clinical cases where the anterior supporting teeth will not be essential for good retention of the removable partial denture because this clasp showed to be more resistant than the acetate resin.

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14

Ogutveren, U. Bakir, R. E. Plimley, and I. Nieva. "The behaviour of a trickle tower electrolytic cell for the production of cobalt(III) acetate from cobalt(II) acetate." Journal of Applied Electrochemistry 22, no. 4 (April 1992): 351–57. http://dx.doi.org/10.1007/bf01092688.

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15

Saalfrank, Rolf W., Oliver Struck, Karl Peters, and Hans Georg von Schnering. "Synthese, Reaktivität und Struktur von Semicorrinatcobalt-Komplexen [1] / Synthesis, Reactivity and Structure of Cobalt Semicorrinate Complexes [1]." Zeitschrift für Naturforschung B 49, no. 10 (October 1, 1994): 1415–24. http://dx.doi.org/10.1515/znb-1994-1019.

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AbstractRecently we have shown that reaction of copper(II) acetate with pyrrolidines 3 (HL1) and 4 (HL2) leads to the formation of the 2D-coordination polymer 1 and the helical 1 D-polymer 2. Ligands of semicorrin type 9 (HL3-5) exhibit similar structural motives compared with the tridentate pyrrolidine ligands 3 and 4. Reaction of semicorrin 9a (HL3) with Co(II) acetate yields the mononuclear chelate complex 10a (CoL32), whereas in the presence of oxygen the formation of the oxidation product 14 [CoL32(OAc)] is observed. The chiral semicorrin ligands 9b, c (HL4, HL5) react with metal(II) acetates to give the complexes 10b,c-13b,c via diastereospecific complexation. The structures of the cobalt complexes have been established by single-crystal X-ray diffraction.

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16

Hirano, Masao, and Takashi Morimoto. "Oxidation by cobalt(III) acetate. Part 7. Regioselective synthesis of substituted cyclohexenyl acetates." Journal of the Chemical Society, Perkin Transactions 2, no. 8 (1985): 1105. http://dx.doi.org/10.1039/p29850001105.

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17

Kamenshchikov, Oleg Yu, Alexander A. Ketov, V. S. Korzanov, Marina P. Krasnovskikh, and I. G. Mokrushin. "Preparation of metallic cobalt powders by thermolysis of cobalt (II) acetate, oxalate and formate." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 11, no. 1 (2021): 5–16. http://dx.doi.org/10.17072/2223-1838-2021-1-5-16.

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The thermal decomposition of cobalt (II) formate, acetate, and oxalate was studied by synchronous thermal analysis. It is established that in all cases the final product is metallic cobalt. Thermogravi- metric analysis combined with differential scanning calorimetry and mass spectroscopy made it possi- ble to establish thermolysis schemes and gaseous products of salt decomposition. The conditions for obtaining powdered metallic cobalt from carboxylic acid salts are determined. It was determined by electron microscopy that the particle size and structure of metal powders depend on the type of initial salt.

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18

Seo, Deok Min, Myung Gwan Hahm, and Young Lae Kim. "Bundle Size Engineering of Single-Walled Carbon Nanotubes on Silica Nanoparticles." Journal of Nanomaterials 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/6379358.

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Small and large single-walled carbon nanotubes (SWCNTs) bundles from different-sized cobalt catalyst clusters have been synthesized and prepared through chemical vapor deposition (CVD) method by using Co-acetate ethanol solution with silica nanoparticles. By controlling concentration of Co-acetate ethanol solution (0.2 wt% and 0.4 wt%), various sizes and types of bundle of SWCNTs are grown on the silica nanoparticle substrates. Synthesized SWCNT’s diameter ranged from 0.92 nm to 1.63 nm, and chirality of SWCNTs and their electronic property from high concentration solution show diverse characteristics. In high concentration solution, the large number of cobalt clusters is induced to merge on the surface of silica nanoparticles and then lots of nucleation points are provided by cobalt clusters for growth of SWNTs. These results give us a promising path to selectively synthesize various types of SWCNTs with different shapes of merged cobalt catalyst. Engineering bundle sizes of SWCNTs can be promising key for diverse applications of carbon nanotubes.

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19

Karpenko, L. Yu, P. A. Polistovskaya, and A. I. Kozitsyna. "The effect of high concentrations of heavy metals on the integrity by intestinal epithelium of carp." Issues of Legal Regulation in Veterinary Medicine, no. 1 (April 17, 2022): 58–61. http://dx.doi.org/10.52419/issn2782-6252.2022.1.58.

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The article is devoted to the assessment of the toxic effects of heavy metals on the body of fish. The aim of the study was to study the integrity of the epithelial layer of the carp intestine after exposure to heavy metals (lead, cadmium, zinc, copper and cobalt). In the experiment, 6 groups of fish (european carp) of 10 individuals were used: control; groups of fish contained in solutions of heavy metals exceeding their MPC in reservoirs by 1000 times: in a solution of lead acetate (6 mg/l); in a solution of cadmium acetate (5 mg/l); in a solution of copper acetate (1 mg/l); in zinc acetate solution (10 mg/l) and in cobalt acetate solution (10 mg/l). The exposure in toxicant solutions was 4 hours. Smears-prints of carp intestines were made and with the help of light microscopy, the sloughed "living" cells were counted. The dominant influence of copper on the strength of the intestinal epithelium of fish in comparison with other metals investigated was noted.

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20

El-mehdawi, Ramadan M., Abdussalam N. EL-dewik, Mufida M. Ben-Younes, Fathia A. Treish, Ramadan G. Abuhmaiera, Dejan Poleti, and Jelena Rogan. "Synthesis, Characterization, and Crystal Structure of [Co4(CH3CO2)2L4]2[BPh4]4·0.5H2O, Where HL = 4-(Salicylaldiminato)antipyrine." Journal of Crystallography 2014 (August 27, 2014): 1–6. http://dx.doi.org/10.1155/2014/481572.

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The title complex was isolated as a red solid from the reaction of 4-(salicylaldiminato)antipyrine, HL, and cobalt (II) acetate in ethanol. The complex has been characterized by elemental analysis, FTIR, UV-Vis, and X-ray single crystal diffraction. Two crystallographically different cationic units, A and B, of the title complex are found. Both units are essentially isostructural; nevertheless, small differences exist between them. Both units contain four cobalt atoms arranged at the corners of distorted cubane-like core alternatively with phenoxy oxygen of the Schiff base. In both cases, one cobalt binds to three coordinated sites from the corresponding tridentate Schiff base ligand, and the fourth one was bonded by the acetate oxygen, and the fifth and the sixth donor sites come from the phenolate oxygen of another Schiff base ligand.

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21

Ward, Antony J., Matija Burger, Cindy Aquino, Jack K. Clegg, Peter Turner, Anthony F. Masters, and Thomas Maschmeyer. "Bis(2,2′,2′′-nitrilotriethanol)cobalt(II) bis(acetate)." Acta Crystallographica Section E Structure Reports Online 62, no. 10 (September 6, 2006): m2429—m2431. http://dx.doi.org/10.1107/s160053680603443x.

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22

Mohamed, M. A., S. A. Halawy, and M. M. Ebrahim. "The non-isothermal decomposition of cobalt acetate tetrahydrate." Journal of Thermal Analysis 41, no. 2-3 (February 1994): 387–404. http://dx.doi.org/10.1007/bf02549322.

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23

Nickolov, Zh, G. Georgiev, D. Stoilova, and I. Ivanov. "Raman and IR study of cobalt acetate dihydrate." Journal of Molecular Structure 354, no. 2 (July 1995): 119–25. http://dx.doi.org/10.1016/0022-2860(95)08877-x.

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24

Blake, Antony B., John R. Chipperfield, Seng Lau, and David E. Webster. "Studies on the nature of cobalt(III) acetate." Journal of the Chemical Society, Dalton Transactions, no. 12 (1990): 3719. http://dx.doi.org/10.1039/dt9900003719.

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25

HIRANO, M., T. ISHII, and T. MORIMOTO. "ChemInform Abstract: Oxidation by Cobalt(III) Acetate. Part 13. Oxidation of Substituted Phenols with Cobalt(III) Acetate in Acetic Acid." ChemInform 22, no. 31 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199131097.

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26

Ozutsumi, Kazuhiko, Shintaro Ohnishia, Hitoshi Ohtaki, and Masaaki Tabatab. "Structure of the Short-Lived Intermediate Formed during the Metal Substitution Reaction of the Mercury(II) Porphyrin Complex with Cobalt(II) Ion in Aqueous Solution Determined by the Stopped-Flow EXAFS Method." Zeitschrift für Naturforschung B 53, no. 4 (April 1, 1998): 469–75. http://dx.doi.org/10.1515/znb-1998-0413.

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The local structure around the cobalt(II) ion in the reaction intermediate formed during the metal substitution reaction of the homodinuclear mercury(II) porphyrin (5,10,15,20-tetrakis(4- sulfonatophenyl)porphyrin; H2tpps4- ) complex with a cobalt(II) ion in an acetate buffer has been determined by the stopped-flow EXAFS method. The structure of the reactant and the product of the above reaction has also been determined by the same method. The coordination geometry around the cobalt(II) ion in the heterodinuclear intermediate, [Hg(tpps)Coll]2- , is six-coordinate octahedral with four additional water and/or acetate oxygen atoms. The Coll-N and Coll-O bond lengths in the intermediate are 212(2) and 221(1) pm, respectively. The product, [Coll(tpps)]4-, has a six-coordinate octahedral structure, the Coll-N and Coll-O bond lengths being 203(1) and 215(1) pm, respectively. The Coll-N bond length in the intermediate is ca. 9 pm longer than that in the product. The Coll-O bond length in the intermediate is also ca. 9 pm longer than that of 212(1) pm in the reactant, the cobalt(II) acetato complex, and ca. 6 pm longer than that in the product. The longer Coll-O bond in the intermediate as compared to those in the reactant and in the product appears to be responsible for the instability of the intermediate. The oxidized product, [Colll(tpps)]3-, has a six-coordinate structure with two additional Colll-O bonds. The Colll-N and Colll-O bond lengths are 189(1) and 197(2) pm, respectively, and are much shorter than those in [Coll(tpps)]4-.

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27

Maruyama, Toshiro, and Tsuyoshi Nakai. "Cobalt oxide thin films prepared by chemical vapor deposition from cobalt (II) acetate." Solar Energy Materials 23, no. 1 (November 1991): 25–29. http://dx.doi.org/10.1016/0165-1633(91)90150-j.

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28

Clegg, Jack K., Michael J. Hayter, Katrina A. Jolliffe, and Leonard F. Lindoy. "Tetraaquabis(pyridine-κN)cobalt(II) diacetate." Acta Crystallographica Section E Structure Reports Online 62, no. 4 (March 29, 2006): m873—m874. http://dx.doi.org/10.1107/s1600536806010257.

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In the title complex, [Co(C5H5N)2(H2O)4](C2H3O2)2, the octahedral cation is hydrogen bonded to the acetate anions via the coordinated water molecules. The cation and anions lie on a crystallographic mirror plane.

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29

Wu, Yan Bo, Peng Sun, Ting Lou, and Tie Ben Song. "Preparation of Co₃O₄-Activated Carbon Fiber by Electrospinning and its Performance of Adsorbing Low Concentration SO₂ ." Advanced Materials Research 486 (March 2012): 160–65. http://dx.doi.org/10.4028/www.scientific.net/amr.486.160.

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The poly (vinyl pyrrolidone) (PVP)/Cobalt Acetate Composite nanofibers were prepared by electrospinning method. Then we got Co3O4-activated carbon fiber (ACF) from PVP/Cobalt Acetate composite nanofibers after preoxidation, carbonation and activation. Study the effect of different adsorption conditions on the adsorption rate of low concentration SO2. The SEM, TG-DTA, XRD, FT-IR and BET analysis methods is used to characterize. The results show that the specific surface area of Co3O4-ACF obtained reach 1238.5 m2/g, and it contains Co3O4 after carbonation. The adsorption rate can reach 69.0%, when the concentration of SO2 is 1.0 μg/mL, adsorption temperature is 20, and adsorption time is 10 minimum.

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30

Wang, Pucheng, Hu Wang, Qibao Dong, and Ruke Bai. "Cobalt-Mediated Radical Copolymerization of Chlorotrifluoroethylene and Vinyl Acetate." Polymers 11, no. 1 (January 9, 2019): 101. http://dx.doi.org/10.3390/polym11010101.

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Controlled radical copolymerization of chlorotrifluoroethylene (CTFE) and vinyl acetate (VAc) was successfully achieved in the presence of bis(acetylacetonato)cobalt(II) (Co(acac)2) as a mediated agent and 2,2′-azo-bis-isobutyronitrile (AIBN) as initiator. Both the molar mass and the fluorinated unit content of the copolymer could be controlled, and the chain extension polymerization of the obtained fluorinated copolymer was also achieved.

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31

Xue, Zhiwei, Yuesong Shen, Lin Chu, Yan Wang, Yu Zhang, Zhefei Sun, Jianhai Wang, Yanwei Zeng, Peiwen Li, and Shemin Zhu. "NaCl-induced nickel–cobalt inverse spinel structure for boosting hydrogen evolution from ethyl acetate and water." Journal of Materials Chemistry A 7, no. 4 (2019): 1700–1710. http://dx.doi.org/10.1039/c8ta10414j.

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32

Lin, Yi-Heng, Po-Chia Huang, Sheng-Chang Wang, and Jow-Lay Huang. "Highly active electrocatalyst cobalt-carbide nanoparticles synthesized by wet-chemistry method for hydrogen evolution reaction." Modern Physics Letters B 34, no. 07n09 (March 16, 2020): 2040022. http://dx.doi.org/10.1142/s0217984920400229.

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Hydrogen is a promising alternative energy without greenhouse gas emissions. The transition metal carbides (TMCs) are considered a sustainable alternatives to noble metals in catalysis. Among the TMCs, Co[Formula: see text]C ([Formula: see text] = 2, 3) nanoparticles (NPs) act as an excellent electrocatalyst for hydrogen evolution reaction (HER) by water splitting. In our report, Co[Formula: see text]C nanocomposites were synthesized by wet chemistry method using cobalt (II) acetate, sodium hydroxide as precursors and triethylene glycol as solvent. In addition, Co2C NPs were synthesized by similar wet chemistry method using cobalt (II) acetate as precursors and triethylene glycol, oleylamine as solvent. The cobalt carbide NPs exhibited high electrocatalytic activity. Co[Formula: see text]C nanocomposites performed a −0.33 V onset potential and 91 mV/dec Tafel slope, while the Co2C NPs exhibited a better performance of −0.27 V and 60 mV/dec, respectively.

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33

Guo, Richard, Romelo Gibe, and James R. Green. "Mono- and disubstitutions of (hepta-2,5-diyne-1,7-diol) bis(dicobalt) derivatives Selectivity in Nicholas reactions." Canadian Journal of Chemistry 82, no. 2 (February 1, 2004): 366–74. http://dx.doi.org/10.1139/v03-209.

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Bis(hexacarbonyldicobalt) complexes of benzyl ether methyl ether or benzyl ether acetate derivatives of hepta-2,5-diyne-1,7-diols undergo selective Lewis-acid-mediated Nicholas reactions with enol silanes, silyl ketene acetals, and allylstannanes, preferentially replacing the methyl ether or acetate function. Hydride nucleophiles are similarly incorporated selectively using a benzyl ether alcohol derivative. Subsequent Nicholas reaction at the benzyloxy-bearing site may be accomplished with an identical or a different nucleophile, affording skipped 1,4-diyne-Co4(CO)12 complexes. In instances of lower selectivity for monosubstitution reactions with benzyl ethers, reverting to the use of a menthyl ether methyl ether complex gives much improved selectivity for methyl ether substitution.Key words: cobalt alkyne complexes, Nicholas reaction, Lewis acids, 1,4-diynes.

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34

Danish, Muhammad, Muhammad Nawaz Tahir, Sana Iftikhar, Muhammad Asam Raza, and Muhammad Ashfaq. "Tetraaquabis[2-(2-nitrophenyl)acetato-κO]cobalt(II)." Acta Crystallographica Section E Crystallographic Communications 71, no. 3 (February 11, 2015): m59—m60. http://dx.doi.org/10.1107/s2056989015002467.

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The molecule of the title compound, [Co(C8H6NO4)2(H2O)4], is centrosymmetric. It is a cobalt(II) complex, bearing two (2-nitrophenyl)acetate and four aqua ligands. The coordination around the CoIIatom is distorted octahedral, defined by four O atoms of water molecules in the equatorial plane and by two carboxylate O atoms at axial positions. The dihedral angles between the benzene ring and the acetate and nitro groups are 61.90 (10) and 19.21 (11)°, respectively. The water molecules form O—H...O hydrogen bonds with the nitro and carboxylate groups, leading to a layered structural arrangement parallel to (001).

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35

Zhang, Sa, Jian Jiang Wang, and Fang Zhao. "Technical Study on Preparation of Co/C Composite Nanofibers via Electrospinning." Materials Science Forum 944 (January 2019): 666–70. http://dx.doi.org/10.4028/www.scientific.net/msf.944.666.

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Co/C composite nanofibers are prepared through electrospinning. Effect of salt, Spinning humidity, receiving equipment and heat treatment on the formation, morphology and structure of composite fibers were investigated. The morphology of composite fibers was observed by scanning electron microscopy (SEM).It was found out that when the ambient humidity was high, the nanofibers were agglomerated into fiber bundles. When the roller receiving equipment was used, ordered nanofibers can be obtained. Only cobalt acetate-doped composite nanofibers maintained intact fiber morphology after pre-oxidation and carbonization. And Co2+ was completely reduced to face-centered cubic structured Co nanoparticle. The ideal preparation technology is as follows: the humidity at 30% or less, doping with organic salt of cobalt acetate.

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36

Dhilip, P., M. Niththiyanandam, N. Sethupathi, and P. Mahalingam. "Alternate Layers of Cobalt Doped Tungsten Oxide and Reduced Graphene Oxide Composite as Electrode Material for Supercapacitor." Asian Journal of Chemistry 32, no. 4 (February 25, 2020): 822–26. http://dx.doi.org/10.14233/ajchem.2020.22470.

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Composites consist of layers of cobalt doped tungsten oxide and reduced graphitic oxide was prepared using jet nebulized spray pyrolysis technique. A mixture of ammonium tungstate and cobalt acetate solution was coated on glass substrate at 380 °C using jet nebulized spray pyrolysis technique. Spray technique is used to form the reduced graphene oxide (rGO) layer over the first layer and again ammonium tungstate and cobalt acetate solution coated over the surface of rGO and then calcined in nitrogen atmosphere at 450 °C for 2 h. The composite were characterized using XRD, SEM, PL, CV and EIS studies. The SEM and XRD reveal the layered structure. Cyclic voltammetry reveals the high specific capacitance 500 Fg-1 at 5 mV s-1 scan rate for 2 M Na2SO4 as electrolyte. Layered structure of CoWO4/rGO/CoWO4 composite enhances the specific capacitance. EIS gives the electrical series resistance of 7.9 Ω. The layered CoWO4/rGO/CoWO4 composite can be suitable electrode materials for supercapacitor.

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37

Saxena, A. K. "Solid State Preparation of the (benzimidazolato)Cobalt(II) Complex from Cobalt Acetate and Benzimidazole." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 30, no. 8 (September 2000): 1417–27. http://dx.doi.org/10.1080/00945710009351843.

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38

Matsuzaki, T., K. Takeuchi, T. Hanaoka, H. Arakawa, and Y. Sugi. "Hydrogenation of carbon monoxide over highly dispersed cobalt catalysts derived from cobalt(II) acetate." Catalysis Today 28, no. 3 (May 1996): 251–59. http://dx.doi.org/10.1016/0920-5861(95)00245-6.

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39

Kowalski, Grzegorz, Jan Pielichowski, and Mirosław Grzesik. "Characteristics of Polyaniline Cobalt Supported Catalysts for Epoxidation Reactions." Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/648949.

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A study of polyaniline (PANI) doping with various cobalt compounds, that is, cobalt(II) chloride, cobalt(II) acetate, and cobalt(II) salen, is presented. The catalysts were prepared by depositing cobalt compounds onto the polymer surface. PANI powders containing cobalt ions were obtained by one- or two-step method suspending PANI in the following acetonitrile/acetic acid solution or acetonitrile and then acetic acid solution. Moreover different ratios of Co(II) : PANI were studied. Catalysts obtained with both methods and at all ratios were investigated using various techniques including AAS and XPS spectroscopy. The optimum conditions for preparation of PANI/Co catalysts were established. Catalytic activity of polyaniline cobalt(II) supported catalysts was tested in dec-1-ene epoxidation with molecular oxygen at room temperature. The relationship between the amount of cobalt species, measured with both AAS and XPS techniques, and the activity of PANI-Co catalysts has been established.

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40

Adiraju, Venkata A. K., Gregory M. Ferrence, and Timothy D. Lash. "Regioselective oxidation and metalation of meso-unsubstituted azuliporphyrins." Organic & Biomolecular Chemistry 14, no. 44 (2016): 10523–33. http://dx.doi.org/10.1039/c6ob02052f.

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Treatment of meso-unsubstituted azuliporphyrins with cobalt or copper(ii) reagents gave internally oxidized derivatives, while silver acetate triggered ring contraction reactions to form silver(iii) benzocarbaporphyrins.

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41

Miao, Xuelang, Wei Zhu, Zhengbiao Zhang, Wei Zhang, Xiulin Zhu, and Jian Zhu. "Photo-induced cobalt-mediated radical polymerization of vinyl acetate." Polym. Chem. 5, no. 2 (2014): 551–57. http://dx.doi.org/10.1039/c3py00913k.

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42

Peng, Chi-How, Jennifer Scricco, Shan Li, Michael Fryd, and Bradford B. Wayland. "Organo-Cobalt Mediated Living Radical Polymerization of Vinyl Acetate." Macromolecules 41, no. 7 (April 2008): 2368–73. http://dx.doi.org/10.1021/ma702500b.

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43

Debuigne, Antoine, Jean-Raphaël Caille, and Robert Jérôme. "Highly Efficient Cobalt-Mediated Radical Polymerization of Vinyl Acetate." Angewandte Chemie International Edition 44, no. 7 (January 11, 2005): 1101–4. http://dx.doi.org/10.1002/anie.200461333.

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44

Debuigne, Antoine, Jean-Raphaël Caille, and Robert Jérôme. "Highly Efficient Cobalt-Mediated Radical Polymerization of Vinyl Acetate." Angewandte Chemie 117, no. 7 (January 11, 2005): 1125–28. http://dx.doi.org/10.1002/ange.200461333.

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45

Morimoto, Takashi, Masao Hirano, and Tsuyoshi Koyama. "Oxidation by cobalt(III) acetate. Part 8. Effects of substituents on product distributions in oxidation of aromatic olefins by cobalt(III) acetate." Journal of the Chemical Society, Perkin Transactions 2, no. 8 (1985): 1109. http://dx.doi.org/10.1039/p29850001109.

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46

Shang, Xiao-Jie, and Zhong-Quan Liu. "A Catalyzed Aerobic Intramolecular C–O Bond Formation: Facile Access to Ring-Fused Dihydrobenzoxazine Derivatives." Synthesis 49, no. 20 (June 27, 2017): 4693–97. http://dx.doi.org/10.1055/s-0036-1588465.

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A catalyst comprising of catalytic cobalt(II) acetate/copper(II) acetate/dl-tyrosine with oxygen as the oxidant allows aerobic intramolecular C–O bond construction in [2-(pyrrolidin-1-yl)phenyl]methanol by free-radical promoted intramolecular selective functionalization of an (sp3)C–H bond by the alcohol, thus providing an environmentally friendly approach to 5H-benzo[d]pyrrolo[2,1-b][1,3]oxazine derivatives.

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47

Sk, Md Raja, and Modhu Sudan Maji. "Cobalt(iii)-catalyzed ketone-directed C–H vinylation using vinyl acetate." Organic Chemistry Frontiers 7, no. 1 (2020): 19–24. http://dx.doi.org/10.1039/c9qo01164a.

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Weakly coordinating, ketone-directed C–H vinylation using vinyl acetate is reported here for a wide range of aromatic ketones such as acetophenones, diaryl ketones, chromones and chalcones under cost-effective and air-stable cobalt(iii)-catalysis.

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48

Hou, Yan-Jun, Ying-Hui Yu, Zhi-Zhong Sun, Bai-Yan Li, and Guang-Feng Hou. "Triaqua[(4-nitrophenylsulfonyl)acetato-κO](1,10-phenanthroline-κ2N,N′)cobalt(II) (4-nitrophenylsulfonyl)acetate monohydrate." Acta Crystallographica Section E Structure Reports Online 63, no. 7 (June 13, 2007): m1884. http://dx.doi.org/10.1107/s160053680702819x.

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49

Gan, Yong X., and Jeremy B. Gan. "Measuring the Electrical and Photonic Properties of Cobalt Oxide-Containing Composite Carbon Fibers." Journal of Composites Science 4, no. 4 (October 22, 2020): 156. http://dx.doi.org/10.3390/jcs4040156.

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In this work, cobalt acetate was incorporated into polyacrylonitrile (PAN) polymer through electrospinning as the cobalt oxide source. After oxidization and pyrolysis, a PAN-derived composite carbon fiber containing cobalt oxide was obtained. Measuring the electrical and photonic properties of the composite fiber under visible light irradiation was performed to evaluate the photoelectric behavior of the composite fiber. The p-type semiconducting behavior of the composite fiber was confirmed by measuring the open circuit voltage of a photochemical fuel cell consisting of the photosensitive electrode made from the composite fiber. The application of the composite fiber for glucose sensing was demonstrated.

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50

Mhamdi, Mourad, Eric Marceau, Sihem Khaddar-Zine, Abdelhamid Ghorbel, Michel Che, Younes Ben Taarit, and Fran�oise Villain. "Formation of Cobalt Phyllosilicate During Solid State Preparation of Co2+/ZSM5 Catalysts from Cobalt Acetate." Catalysis Letters 98, no. 2-3 (November 2004): 135–40. http://dx.doi.org/10.1007/s10562-004-7928-2.

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