Journal articles: 'Violet copper'

1

Reimann, K., and St Rübenacke. "Violet laser emission in copper halides." Journal of Applied Physics 76, no. 8 (1994): 4897–99. http://dx.doi.org/10.1063/1.357268.

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2

Ponnar, M., and K. Pushpanathan. "Strong Ultra-Violet Absorption in Cu Doped CeO2 Nanospheres." Advanced Science Letters 24, no. 8 (2018): 5947–52. http://dx.doi.org/10.1166/asl.2018.12225.

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This article focuses the synthesis and characterization of copper doped cerium oxide nanospheres synthesized by chemical precipitation method. Synthesized nanopowders were characterized by means of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, ultraviolet-visible spectrometer and photoluminescence spectrometer. X-ray diffraction study confirmed the copper doping without disturbing the face centred cubic structure of cerium oxide. Field emission scanning electron microscope and transmission electron microscope study also confirmed the existence of sphere like nanoparticles. The optical absorption spectrum shows that the synthesized samples exhibit strong absorption in ultraviolet region and also it confirmed the decrease in energy gap of cerium oxide on copper doping. The photoluminescence study revealed that the blue emission is attributed to the fast oxygen transportation of copper doped cerium oxide nanoparticles.

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3

Liu, Xi, and Guo-Cong Guo. "A Novel Copper Cyanide Complex with a Layered Structure." Australian Journal of Chemistry 61, no. 7 (2008): 481. http://dx.doi.org/10.1071/ch08025.

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The solvothermal reaction of copper(i) cyanide with 18-crown-6 (18C-6) in anhydrous acetonitrile and further diffusion with ether leads to a novel copper cyanide complex Cu(CN)(CH3CN)·0.5(18C-6) with a rare layered structure that exhibits complex violet luminescence originating from different layers.

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4

YAMAMOTO, Koichi, and Shoji MOTOMIZU. "Spectrophotometric determination of copper with iodide ion and Crystal Violet." Bunseki kagaku 38, no. 3 (1989): 103–8. http://dx.doi.org/10.2116/bunsekikagaku.38.3_103.

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5

Costa, A. C. Spinola, Leonardo S. G. Teixeira, and Sérgio L. C. Ferreira. "Spectrophotometric determination of tin in copper-based alloys using pyrocatechol violet." Talanta 42, no. 12 (1995): 1973–78. http://dx.doi.org/10.1016/0039-9140(95)01677-5.

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6

Goodwin, HA, D. Onggo, BW Skelton, and AH White. "Coordination of 3,3'-Bipyridazine With Bivalent Copper, Palladium and Platinum." Australian Journal of Chemistry 43, no. 11 (1990): 1919. http://dx.doi.org/10.1071/ch9901919.

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Bis ( ligand ) complexes of the diimine 3,3′-bipyridazine (L) with bivalent copper, palladium and platinum are described. Green and violet forms of [CuL2] [BF4]2 were obtained, and the electronic and vibrational spectra suggest coordinated fluoroborate groups in the violet species. In the green complex a tetragonal structure is indicated. Coordination of perchlorate in [PdL2] [ClO4]2 is also indicated but not in [PtL2] [ClO4]2. Structure determination of the latter complex reveals a strictly planar PtN4 moiety, and in fact the whole complex cation is approximately planar. Reduced interligand repulsions, compared to those operative in bis ( ligand ) complexes of 2,2?-bipyridine, are believed to allow the essentially planar conformation. The structure of [PtL2] [ClO4]2 was determined at 295 K by single-crystal X-ray diffraction methods, and was refined to a residual of 0.033 for 1942 'observed' independent reflections. Crystal data: [PtL2][ClO4]2 monoclinic, space group P21/c (C5/2h, No. 14), a 7.919(2), b 13.086(3), c 10.313(3)Ǻ, β 107.16(2)°.

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7

Wang, Xiu Li, and Qiu Ming Gao. "Synthesis of Copper(0) Nanoparticles in Nanoporous Nickel Phosphate VSB-1." Solid State Phenomena 121-123 (March 2007): 479–82. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.479.

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Copper(0) nanoparticles in nanoporous nickel phosphate VSB-1 were prepared by the methods of ion exchange and hydrogen reduction. X-ray powder diffraction (XRD) results show that the crystal structure of VSB-1 was well retained after the encapsulation of copper nanoparticles and no apparent evidence of crystalline copper was observed. The Cu 2p core level binding energies were consistent with elemental Cu(0) appear in the X-ray photoelectron spectroscopy (XPS) data. Room temperature ultra violet visible (UV-Vis) absorption spectrum is characteristic of Cu(0) nanoparticles [1, 2]. Nanoporous material VSB-1 is an excellent host to synthesize metal or metal oxide nanoparticles due to its homogeneous nanopores and its high thermal stability.

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8

Marsh, J. M., M. G. Davis, M. J. Flagler, et al. "Advanced hair damage model from ultra-violet radiation in the presence of copper." International Journal of Cosmetic Science 37, no. 5 (2015): 532–41. http://dx.doi.org/10.1111/ics.12231.

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9

Getova, Valentina, Ivayla Pantcheva, Darvin Ivanov, Dimitar Mehandjiev, Vassil Skumryev, and Panayot Bontchev. "Copper(II) complexes of the antihypertensive drug nadolol." Open Chemistry 5, no. 1 (2007): 118–31. http://dx.doi.org/10.2478/s11532-006-0070-9.

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AbstractThe complexation of the non-selective β-blocker nadolol, HL, 1 with copper(II) leads to formation of mono-and dinuclear complexes depending mainly on the metal-to-ligand molar ratio. The mononuclear violet complex CuL2·2Solv, 2, was obtained in a soluble form at metal-to-ligand molar ratio Cu(II): HL ≤ 1: 10 in methanolic or slightly alkaline aqueous solutions. The dinuclear green complex Cu2L2Cl2·H2O, 3 was synthesized at Cu(II): HL ≥ 1: 2 molar ratio in methanolic solutions. The complexes were studied using spectral (UV-Vis, FT-IR, EPR), magnetochemical, thermogravimetric methods and elemental analysis. In the complexes nadolol acts as a monoanionic bidentate ligand coordinated to copper(II) through the NH-and the deprotonated OH-groups of its aminoalcohol fragment.

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10

Duan, Qiannan, Jianchao Lee, Han Chen, and Yunyun Zheng. "Preparation and catalytic performance of copper-containing magnetic catalysts for degradation of azo dye (direct violet)." Water Science and Technology 76, no. 11 (2017): 3069–78. http://dx.doi.org/10.2166/wst.2017.475.

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Abstract A novel magnetically separable magnetic activated carbon supporting-copper (MCAC) catalyst for catalytic wet peroxide oxidation (CWPO) was prepared by chemical impregnation. The prepared samples were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS). The catalytic performance of the catalysts was evaluated by direct violet (D-BL) degradation in CWPO experiments. The influence of preparative and operational parameters (dipping conditions, calcination temperature, catalyst loading H2O2 dosage, pH, reaction temperature, additive salt ions and initial D-BL concentration) on degradation performance of CWPO process was investigated. The resulting MCAC catalyst showed higher reusability in direct violet oxidation than the magnetic activated carbon (MAC). Besides, dynamic tests also showed the maximal degradation rate reached 90.16% and its general decoloring ability of MCAC was 34 mg g−1 for aqueous D-BL.

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11

Šafařík, Ivo, Miroslava Šafaříková, and Naděžda Vrchotová. "Study of Sorption of Triphenylmethane Dyes on a Magnetic Carrier Bearing an Immobilized Copper Phthalocyanine Dye." Collection of Czechoslovak Chemical Communications 60, no. 1 (1995): 34–42. http://dx.doi.org/10.1135/cccc19950034.

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Magnetite particles bearing covalently immobilized copper phthalocyanine dye ("blue magnetite") were prepared and used for the sorption of triphenylmethane dyes from aqueous solutions. The binding of some triphenylmethane dyes bearing two or three amino groups (basic fuchsin, crystal violet, malachite green) followed the Langmuir adsorption model. The maximum adsorption capacities were calculated. Dyes having no amino group in their molecules exhibited only low adsorption to immobilized copper phthalocyanine. The presence of amino groups in the molecules of triphenylmethane dyes seems to be necessary for their efficient binding on blue magnetite. Generally, efficient sorption of the organic compounds to immobilized copper phthalocyanine may be conditional on a cooperative effect of two parameters, viz. a certain planarity of the sorbate molecule and interaction of the central copper ion of the phthalocyanine molecule with the sorbate amino group or heterocyclic nitrogen atom.

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12

Soula, Brigitte, Anne-Marie Galibert, Bruno Donnadieu, and Paul-Louis Fabre. "Complexation of croconate violet with copper(II). Crystal structures, spectroscopic characterizations and redox studies." Inorganica Chimica Acta 324, no. 1-2 (2001): 90–98. http://dx.doi.org/10.1016/s0020-1693(01)00560-6.

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13

Safarik, Ivo, Eva Baldikova, Mirka Safarikova, and Kristyna Pospiskova. "Magnetically responsive textile for a new preconcentration procedure: Magnetic textile solid phase extraction." Journal of Industrial Textiles 48, no. 4 (2017): 761–71. http://dx.doi.org/10.1177/1528083717740767.

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A new preconcentration procedure named “Magnetic textile solid phase extraction” was developed. A piece of nonwoven textile (fabric) was used for the immobilization of copper phthalocyanine dye and employed for the adsorption of crystal violet and safranin O from large volumes of sample. The bound dye was eluted into small volume of methanol. The limit of detection and limit of quantification values for safranin O were 2.66 µg/L and 8.87 µg/L, while for crystal violet these values were 2.17 µg/L and 7.23 µg/L, respectively. Linearity in the range 5–100 µg/L was observed. In order to prepare magnetically responsive adsorbent, an iron-based standard staple was inserted in the textile material using an office stapler. The developed procedure can be easily adapted for the detection of large variety of analytes in biochemistry, biotechnology, environmental technology, and forensic analysis.

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14

Trifkovic, Ljiljana, and Gordana Milovanovic. "Investigation of the effect of organic solvents on kinetic parameters in metal catalyzed reactions." Journal of the Serbian Chemical Society 65, no. 3 (2000): 201–6. http://dx.doi.org/10.2298/jsc0003201t.

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The effects of acetone and acetonitrile on the kinetic parameters of azorubin S oxidation by hydrogen peroxide catalyzed by manganese(II), pyrocatechol violet oxidation by hydrogen peroxide catalyzed by copper(II), and carminic acid oxidation by hydrogen peroxide catalyzed by copper(II) and activated by bifenox, were examined. It was established that the examined solvents exhibit various effects on the kinetic parameters of the above said reactions. In all instances a change in the solvent concentration affects both the enthalpy and the entropy contributions to the free activation energy during the transition of the system into the active state, as well as the constant of the active complex formed at this point.

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15

Ukoha, P. O., F. I. Nwabue, and L. N. Obasi. "Solvent Extraction Studies on Copper(II) and Silver(I) Complexes of Bis(4-hydroxypent-2-ylidene)diaminoethane: Composition of Extracted Copper(II) Species." E-Journal of Chemistry 8, no. 4 (2011): 1864–71. http://dx.doi.org/10.1155/2011/582649.

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Copper(II) complexes of bis(4-hydroxypent-2-ylidene)diaminoethane (BHPDE) were prepared by extractive method. Job’s continuous variation and equilibrium constant methods, as well as spectral and elemental analyses were applied in the determination of the nature of extracted species. The results indicate the formation of mixed ionic complexes of the types Cu(H2L)X2, Cu(H2L)2X2and CuL (where H2L = BHPDE and X = NO3-, CIO4-, Cl-or ½SO42-). Cu(H2L)X2and Cu(H2L)2X2predominate at low pH extractions while CuL chelate predominates at high pH extraction. The complexes exist in two isomeric forms, the blue readily-water-soluble and the violet less water-soluble forms. Both complexes show maximum absorption at 540 nm and molar absorptivity values of about 2.0 x 102dm3mole-1cm-1.

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16

Stará, Věra, and Miloslav Kopanica. "Voltammetric determination of trace amounts of aluminium." Collection of Czechoslovak Chemical Communications 54, no. 2 (1989): 370–74. http://dx.doi.org/10.1135/cccc19890370.

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Aluminium is determined voltammetrically in the form of the aluminium complex with Acid Alizarin Violet N in an acetate buffer of pH 5.2 using a hanging mercury drop electrode and the d.c. or differential pulse technique. A linear dependence between the peak current and the aluminium concentration was obtained in the range from 2.10-8 to 5.10-6 mol l-1. The interfering effect of copper, lead and cadmium is eliminated by the auxiliary complex forming reagent-glycine.

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17

Yamamoto, Koichi, and Shoji Motomizu. "Solvent extraction of copper as its ion association complex with ethyl violet and its application to the spectrophotometric determination of copper." Analyst 112, no. 7 (1987): 1011. http://dx.doi.org/10.1039/an9871201011.

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18

Hosono, Hideo, Yoshihiro Abe, and Noriaki Matsunami. "Coalescence of nanosized copper colloid particles formed in Cu‐implanted SiO2glass by implantation of fluorine ions: Formation of violet copper colloids." Applied Physics Letters 60, no. 21 (1992): 2613–15. http://dx.doi.org/10.1063/1.106897.

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19

Maret, Wolfgang, and Henryk Kozłowski. "Electronic absorption and EPR spectroscopy of copper alcohol dehydrogenase: pink, violet and green forms at a Type 1 copper center analog." Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology 912, no. 3 (1987): 329–37. http://dx.doi.org/10.1016/0167-4838(87)90036-7.

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20

Matsubara, Teruo, and Mitsuru Sano. "ISOLATION AND SOME PROPERTIES OF A NOVEL VIOLET COPPER PROTEIN FROM A DENITRIFYING BACTERIUM,ALCALIGENESSP." Chemistry Letters 14, no. 7 (1985): 1053–56. http://dx.doi.org/10.1246/cl.1985.1053.

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21

Tao, Zhihua, Guanting Liu, Yuanxun Li, Ruoyu Zhang, Hua Su, and Sheng Li. "Electrochemical Investigation of Tetrazolium Violet as a Novel Copper Corrosion Inhibitor in an Acid Environment." ACS Omega 5, no. 9 (2020): 4415–23. http://dx.doi.org/10.1021/acsomega.9b03475.

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22

Su, Jing, Yuan-Qiang Sun, Fang-Jun Huo, Yu-Tao Yang, and Cai-Xia Yin. "Naked-eye determination of oxalate anion in aqueous solution with copper ion and pyrocatechol violet." Analyst 135, no. 11 (2010): 2918. http://dx.doi.org/10.1039/c0an00620c.

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23

Khitab, Fatima, Muhammad Rasul Jan, and Jasmin Shah. "Sonophotocatalytic degradation of aqueous Acid Red 27 and Direct Violet 51 using copper impregnated Al2O3." DESALINATION AND WATER TREATMENT 137 (2019): 381–94. http://dx.doi.org/10.5004/dwt.2019.23194.

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24

Loeb, Barbara, Irma Crivelli, and Carlos Andrade. "A violet mixed-valence copper-mercaptoethylamine complex generated electrochemically or by reversible interaction with oxygen." Inorganica Chimica Acta 231, no. 1-2 (1995): 21–27. http://dx.doi.org/10.1016/0020-1693(94)04330-x.

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25

Shen, Hui, Lingzheng Wang, Omar López-Estrada, et al. "Copper-hydride nanoclusters with enhanced stability by N-heterocyclic carbenes." Nano Research 14, no. 9 (2021): 3303–8. http://dx.doi.org/10.1007/s12274-021-3389-9.

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AbstractCopper-hydrides have been intensively studied for a long time due to their utilization in a variety of technologically important chemical transformations. Nevertheless, poor stability of the species severely hinders its isolation, storage and operation, which is worse for nano-sized ones. We report here an unprecedented strategy to access to ultrastable copper-hydride nanoclusters (NCs), namely, using bidentate N-heterocyclic carbenes as stabilizing ligands in addition to thiolates. In this work, a simple synthetic protocol was developed to synthesize the first large copper-hydride nanoclusters (NCs) stabilized by N-heterocyclic carbenes (NHCs). The NC, with the formula of Cu31(RS)25(NHC)3H6 (NHC = 1,4-bis(1-benzyl-1H-benzimidazol-1-ium-3-yl) butane, RS = 4-fluorothiophenol), was fully characterized by high resolution Fourier transform ion cyclotron resonance mass spectrum, nuclear magnetic resonance, ultra-violet visible spectroscopy, density functional theory (DFT) calculations and single-crystal X-ray crystallography. Structurally, the title cluster exhibits unprecedented Cu4 tetrahedron-based vertex-sharing (TBVS) superstructure (fusion of six Cu4 tetrahedra). Moreover, the ultrahigh thermal stability renders the cluster a model system to highlight the power of NHCs (even other carbenes) in controlling geometrical, electronic and surface structure of polyhydrido copper clusters.

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26

Xu, Dapeng, Yifan Zhang, Song Zhang, Wei Yang, Zixiong Wang, and Jiajia Li. "Copper nanoleaves SERS substrates with high surface roughness for sensitive detection crystal violet and rhodamine 6G." Optics & Laser Technology 145 (January 2022): 107502. http://dx.doi.org/10.1016/j.optlastec.2021.107502.

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27

Curtis, NF. "5-Coordinate Compounds of Nickel(II) and Copper(II) With the Triamine Diimine Ligands 13-imino-4,4,6,11,11-pentamethyl-3,7,10-Triazatetradec-6-en-1-amine and 4,6,11-Triethyl-13-imino-4,11-dimethyl-3,7,10-triazapentadec-6-en-1-amine." Australian Journal of Chemistry 41, no. 6 (1988): 957. http://dx.doi.org/10.1071/ch9880957.

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Reaction of nickel(II) with 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene diperchlorate in the presence of ammonia yields a lilac- coloured complex of nickel(II) with 13-imino-4,4,6,11,11-pentamethyl-3,7,10-triazatetradec-6-en-1-amine, a pentadentate ligand with one primary and two secondary amino, plus one primary and one secondary imino , donor groups. The copper(II) complex of the ligand was formed from the nickel(II) compound by metal-ion substitution. The cations have d-d spectra indicative of five-coordination. The complex cations undergo a reversible protonation reaction with a change from five-coordinate to square planar, with a colour change for nickel(II) from lilac (triplet ground state) to yellow (singlet ground state), and for copper(II) from blue to violet. The compounds of the homologous ligand 4,6,11-triethyl-13-imino-4,11- dimethyl-3,7,10-triazapentadec-6-en-1-amine were similarly prepared, and have similar properties.

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28

Usha, K. Y., K. Praveen, and B. Rajasekhar Reddy. "Enhanced Production of Ligninolytic Enzymes by a Mushroom Stereum ostrea." Biotechnology Research International 2014 (December 30, 2014): 1–9. http://dx.doi.org/10.1155/2014/815495.

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The white rot fungi Stereum ostrea displayed a wide diversity in their response to supplemented inducers, surfactants, and copper sulphate in solid state fermentation. Among the inducers tested, 0.02% veratryl alcohol increased the ligninolytic enzyme production to a significant extent. The addition of copper sulphate at 300 μM concentration has a positive effect on laccase production increasing its activity by 2 times compared to control. Among the surfactants, Tween 20, Tween 80, and Triton X 100, tested in the studies, Tween 80 stimulated the production of ligninolytic enzymes. Biosorption of dyes was carried out by using two lignocellulosic wastes, rice bran and wheat bran, in 50 ppm of remazol brilliant blue and remazol brilliant violet 5R dyes. These dye adsorbed lignocelluloses were then utilized for the production of ligninolytic enzymes in solid state mode. The two dye adsorbed lignocelluloses enhanced the production of laccase and manganese peroxidase but not lignin peroxidase.

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29

Phatai, Piaw, Jutharatana Klinkaewnarong, and Surachai Yaiyen. "Adsorption of Methyl Violet Dye from Aqueous Solutions by Activated Carbon Produced from Tamarind Seeds." Advanced Materials Research 911 (March 2014): 326–30. http://dx.doi.org/10.4028/www.scientific.net/amr.911.326.

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The present work proposes the adsorption of methyl violet (MV) from two solution systems including single MV and binary MV-Cu2+systems by activated carbon (AC) prepared from tamarind seeds in a batch system. Parameters including contact time, solution pH, adsorbent dose, and initial dye concentration were studied. The morphology of the AC was determined by scanning electron microscopy (SEM). The results showed the maximum adsorption of MV dye onto the AC at a contact time of 60 min, solution pH of 9.0 and adsorbent dose of 0.2 and 0.5 g for the single and binary solution systems, respectively. The presence of copper ions in binary solution system decreased the adsorption efficiency of MV dye onto the AC. The equilibrium adsorption data were analyzed using Langmuir, Freundlich and Temkin isotherms.

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30

Ghazalli, Nur Fatiha, Leny Yuliati, Salasiah Endud, Mustaffa Shamsuddin, and Hendrik O. Lintang. "Vapochromic Copper (I) Pyrazolate Complex Materials for Phosphorescent Chemosensors of Ethanol." Advanced Materials Research 970 (June 2014): 44–47. http://dx.doi.org/10.4028/www.scientific.net/amr.970.44.

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Here chemosensor materials of trinuclear copper (I) pyrazolate complexes have been successfully synthesized and isolated using two types of 3,5-dimethyl and 4-(3,5-dimethoxybenzyl)-3,5-dimethyl pyrazole ligands. Upon excitation at 280 nm, the resulting trinuclear 3,5-dimethyl copper (I) pyrazolate complex (complex A) and trinuclear 4-(3,5-dimethoxybenzyl) copper (I) pyrazolate complex (complex B) showed emission bands centered at 590 and 604 nm, respectively. These results were in good agreement with their greenish-white powders and it is characteristic of phosphorescent metal complexes from the weak Cu (I)-Cu (I) metallophilic interaction. Upon direct or stepwise exposure to ethanol vapor with series of concentrations (12.5, 25, 50, 100, 150 and 200μL in 22 mg of chemosensor), the emission of chemosensor complex A was not shifted even after 1 d. Interestingly, chemosensor complex B showed gradually changes in both emission band with shifting from 602 to 552 nm and color with changing from orange to green under Ultra-violet (UV) hand lamp (254 nm) at the dark room due to the attachment of benzyl ring to the pyrazole ligand. This positive response for chemosensor complex B was reversible; hence, this optical phosphorescent material can be used for developing vapochromic sensors of ethanol.

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Saravanan, N., and G. Rathika. "REMOVAL OF DYES (METHYLENE BLUE, MALACHITE GREEN, METHYL VIOLET) ON ACTIVATED CARBON PREPARED FROM COPPER POD FLOWER." International Journal of Advanced Research 5, no. 7 (2017): 2578–85. http://dx.doi.org/10.21474/ijar01/5000.

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Fogg, A. "Cathodic stripping voltammetry of copper-complexed reactive dyes at a hanging mercury drop electrode: Reactive violet 5." Talanta 44, no. 1 (1997): 125–29. http://dx.doi.org/10.1016/s0039-9140(96)02014-0.

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Salem, Ibrahim A. "Activation of H2O2 by Amberlyst-15 resin supported with copper(II)-complexes towards oxidation of crystal violet." Chemosphere 44, no. 5 (2001): 1109–19. http://dx.doi.org/10.1016/s0045-6535(00)00478-1.

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34

Das, Susmita, and Vimal Chandra Srivastava. "Hierarchical Nanostructured ZnO-CuO Nanocomposite and its Photocatalytic Activity." Journal of Nano Research 35 (October 2015): 21–26. http://dx.doi.org/10.4028/www.scientific.net/jnanor.35.21.

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Metal oxide nanocomposite (ZnO-CuO) was successfully synthesized by one step homogeneous coprecipitation method and further characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron micrograph (SEM), X-ray diffraction analysis (XRD) and UV-visible diffuse reflectance spectra. XRD analysis exhibited presence of pure copper oxide and zinc oxide within the nanocomposite. SEM analysis indicated that the ZnO-CuO nanocomposite was consisted of flower shaped ZnO along with leaf shaped CuO. Photocatalytic activity of nanocomposite was evaluated in terms of degradation of methylene blue (MB) dye solution under ultra-violet radiation. Results showed that the photocatalytic efficiency of ZnO-CuO nanocomposite was higher than its individual pure oxides (ZnO or CuO).

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35

Köcker, Rolf Meyer zu, Kurt Dehnicke, and Dieter Fenske. "Cu6Br6(NPMe3)4, ein gemischt-valenter Kupfercluster / Cu6Br6(NPMe3)4, a Mixed-Valent Cluster of Copper." Zeitschrift für Naturforschung B 49, no. 7 (1994): 987–90. http://dx.doi.org/10.1515/znb-1994-0724.

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Abstract Cu6Br6(NPMe3)4 has been prepared as a by-product from the reaction of CuBr with Me3SiNPMe3 in a CH2Cl2 suspension. The dark red-violet crystals, which contain three molecules CH2Cl2 per unit cell, have been characterized by a crystal structure determination. Cu6Br6(NPMe3)4 · 3 CH2Cl2: Space group P1̅, Z = 2, lattice dimensions at -95 °C: a = 1165.2(4), b = 1168.9(4), c = 1842.9(6) pm, a = 75.61(3)°, β = 84.15(3)°, γ = 61.08(2)°, 6918 observed unique reflections, R = 0.066. In the cluster molecule Cu6Br6(NPMe3)4 the copper atoms form a nearly ideal octahedron with Cu-Cu bond lengths of 268.8 pm in average. Each of the Cu atoms is connected with a terminal bromine atom. Four planes of the octahedron are capped by μ3-nitrogen atoms of the (NPMe3)- groups.

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36

Ajibade, Peter A., and Abimbola E. Oluwalana. "Enhanced Photocatalytic Degradation of Ternary Dyes by Copper Sulfide Nanoparticles." Nanomaterials 11, no. 8 (2021): 2000. http://dx.doi.org/10.3390/nano11082000.

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We report the effect of thermolysis time on the morphological and optical properties of CuS nanoparticles prepared from Cu(II) dithiocarbamate single-source precursor. The as-prepared copper sulfide nanoparticles were used as photocatalysts for the degradation of crystal violet (CV), methylene blue (MB), rhodamine B (RhB), and a ternary mixture of the three dyes (CV/MB/RhB). Powder XRD patterns confirmed the hexagonal covellite phase for the CuS nanoparticles. At the same time, HRTEM images revealed mixed shapes with a particle size of 31.47 nm for CuS1 prepared at 30 min while CuS2 prepared at 1 h consists of mixtures of hexagonal and nanorods shaped particles with an average size of 21.59 nm. Mixed hexagonal and spherically shaped particles with a size of 17.77 nm were obtained for CuS3 prepared at 2 h. The optical bandgaps of the nanoparticles are 3.00 eV for CuS1, 3.26 eV for CuS2 and 3.13 eV for CuS3. The photocatalytic degradation efficiency showed that CuS3 with the smallest particle size is the most efficient photocatalyst and degraded 85% of CV, 100% of MB, and 81% of RhB. The as-prepared CuS showed good stability and recyclability and also degraded ternary dyes mixture (CV/MB/RhB) effectively. The byproducts of the dye degradation were evaluated using ESI-mass spectrometry.

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37

Wang, Y., Z. L. Wu, K. Lu, and Y. J. Sun. "Study on Technology of Simultaneous Removal of Copper Ion and Crystal Violet in Aqueous Solution by Foam Separation." Separation Science and Technology 46, no. 7 (2011): 1200–1204. http://dx.doi.org/10.1080/01496395.2010.550080.

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38

Das, Nirmal Kumar, Subhadip Ghosh, Sunidhi Jaiswal, Anu Tewary, and Saptarshi Mukherjee. "Micelles entrapped Cresyl Violet can selectively detect copper and mercury ions in solution: A fluorescence Correlation Spectroscopy investigation." Chemical Physics Letters 682 (August 2017): 147–53. http://dx.doi.org/10.1016/j.cplett.2017.06.019.

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39

Nishanthini, R., M. Muthu Menaka, P. Pandi, P. Bahavan Palani, and K. Neyvasagam. "Investigation on Structural and Optical Properties of Copper Telluride Thin Films with Different Annealing Temperature." International Journal of Nanoscience 17, no. 03 (2018): 1760046. http://dx.doi.org/10.1142/s0219581x17600468.

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The copper telluride (Cu2Te) thin film of thickness 240[Formula: see text]nm was coated on a microscopic glass substrate by thermal evaporation technique. The prepared films were annealed at 150[Formula: see text]C and 250[Formula: see text]C for 1[Formula: see text]h. The annealing effect on Cu2Te thin films was examined with different characterization methods like X-ray Diffraction Spectroscopy (XRD), Scanning Electron Microscopy (SEM), Ultra Violet–Visible Spectroscopy (UV–VIS) and Photoluminescence (PL) Spectroscopy. The peak intensities of XRD spectra were increased while increasing annealing temperature from 150[Formula: see text]C to 250[Formula: see text]C. The improved crystallinity of the thin films was revealed. However, the prepared films are exposed complex structure with better compatibility. Moreover, the shift in band gap energy towards higher energies (blue shift) with increasing annealing temperature is observed from the optical studies.

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40

Rogovine, V. V., V. M. Mushtakova, and V. A. Fomina. "Estimation of Xenobiotic Effects on the Peroxidase-Dependent Plant Immunity as a Means of Ecological Control." Water Quality Research Journal 32, no. 4 (1997): 829–38. http://dx.doi.org/10.2166/wqrj.1997.045.

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Abstract The effect of various dyes, ions of heavy metals (Cd2+, Pb2+, Sn2+, Hg2+, Cu2+) and gaseous waste from thermal power stations (H2S, SO2, NO, NH3) on the peroxi-dase-dependent immunity of pea roots (Pisum sativum) has been studied by luminol-enhanced chemiluminescence. It has been found that copper toxicity could be comparable to that of mercury. Fabric dyes dis-azodye “direct” red and “vat” violet at concentrations of 10-5 M reduced plant chemiluminescence as much as 50%. Hydrogen sulfide turned out to be the most toxic among the gases of the industrial gaseous waste. Considering the importance of peroxidase system activity in plants against various infections, it is necessary to control the possibility of impairment of plant immunity by xenobiotics dissolved in water.

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Elkins, Christopher J., John Fessler, and John K. Eaton. "A Novel Mini Calibrator for Thermochromic Liquid Crystals." Journal of Heat Transfer 123, no. 3 (2000): 604–7. http://dx.doi.org/10.1115/1.1370505.

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A small calibrator has been constructed to facilitate wide-band liquid crystal temperature measurements on complex, curved surfaces. The calibrator’s size, 21.3 mm by 20.3 mm by 10.0 mm thick, makes it ideal for in-situ calibrations at multiple sites on curved surfaces. Its design utilizes the heating/cooling ability of a thermoelectric cooler, and its temperature is quickly and accurately controlled by computer. To test the calibrator’s accuracy, a liquid crystal sample was calibrated. Subsequent comparisons to thermistor measurements of a uniform temperature copper block painted with liquid crystals showed the calibration to be accurate to +/−0.1°C between the red start and the approximate blue start temperatures, and the maximum error was less than +/−0.3°C in the dark blue/violet region.

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Li, Xiaojuan, Lingyan Zheng, Lianzhu Huang, et al. "Adsorption removal of crystal violet from aqueous solution using a metal-organic frameworks material, copper coordination polymer with dithiooxamide." Journal of Applied Polymer Science 129, no. 5 (2013): 2857–64. http://dx.doi.org/10.1002/app.39009.

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Buke, Berrin, Umit Divrikli, Mustafa Soylak, and Latif Elci. "On-line preconcentration of copper as its pyrocatechol violet complex on Chromosorb 105 for flame atomic absorption spectrometric determinations." Journal of Hazardous Materials 163, no. 2-3 (2009): 1298–302. http://dx.doi.org/10.1016/j.jhazmat.2008.07.096.

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Dzhardimalieva, Gulzhian I., Rose K. Baimuratova, Evgeniya I. Knerelman, et al. "Synthesis of Copper(II) Trimesinate Coordination Polymer and Its Use as a Sorbent for Organic Dyes and a Precursor for Nanostructured Material." Polymers 12, no. 5 (2020): 1024. http://dx.doi.org/10.3390/polym12051024.

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Several important synthesis pathways for metal-organic frameworks (MOFs) were applied to determine how the synthesis methods and conditions affect the structure and adsorption capacity of the resulting samples. In the present work, three different synthesis routes were used to obtain copper trimesinate coordination polymer: Slow evaporation (A), solvothermal synthesis using a polyethylene glycol (PEG-1500) modulator (B), and green synthesis in water (C). This MOF was characterized by elemental analysis, infrared spectrometry, X-ray diffraction, scanning electron microscopy, thermogravimetry and volumetric nitrogen adsorption/desorption. The samples have permanent porosity and a microporous structure with a large surface area corresponding to the adsorption type I. The obtained MOF was tested as a sorbent to remove organic dyes methylene blue (МВ), Congo red (CR) and methyl violet (MV) as examples. Dye adsorption followed pseudo-first-order kinetics. The equilibrium data were fitted to the Langmuir and Freundlich isotherm models, and the isotherm constants were determined. Thermodynamic parameters, such as changes in the free energy of adsorption (∆G0), enthalpy (∆H0), and entropy (∆S0), were calculated. Thermolysis of copper trimesinate leads to the formation of carbon materials Cu@C with a high purity.

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Chukanov, Nikita V., Sergey N. Britvin, Gerhard Möhn, et al. "Shilovite, natural copper(II) tetrammine nitrate, a new mineral species." Mineralogical Magazine 79, no. 3 (2015): 613–23. http://dx.doi.org/10.1180/minmag.2015.079.3.07.

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AbstractThe new mineral shilovite, the first natural tetrammine copper complex, was found in a guano deposit located on the Pabellón de Pica Mountain, near Chanabaya, Iquique Province, Tarapacá Region, Chile. It is associated with halite, ammineite, atacamite (a product of ammineite alteration) and thénardite. The gabbro host rock consists of amphibole, plagioclase and minor clinochlore, and contains accessory chalcopyrite. The latter is considered the source of Cu for shilovite. The new mineral occurs as deep violet blue, imperfect, thick tabular to equant crystals up to 0.15 mm in size included in massive halite. The mineral is sectile. Its Mohs hardness is 2. Dcalc is 1.92 g cm–3. The infrared spectrum shows the presence of NH3 molecules and NO3– anions. Shilovite is optically biaxial (+), α = 1.527(2), β = 1.545(5), γ = 1.610(2). The chemical composition (electron-microprobe data, H calculated from ideal formula, wt.%) is Cu 26.04, Fe 0.31, N 30.8, O 35.95, H 4.74, total 100.69. The empirical formula is H12.56(Cu1.09Fe0.01)N5.87O6.00. The idealized formula is Cu(NH3)4(NO3)2. The crystal structure was solved and refined to R = 0.029 based upon 2705 unique reflections having F > 4σ(F). Shilovite is orthorhombic, space group Pnn2, a = 23.6585(9), b = 10.8238(4), c = 6.9054(3) Å, V = 1768.3(1) Å3, Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are: 5.931 (41) (400), 5.841 (100) (011), 5.208 (47) (410), 4.162 (88) (411), 4.005 (62) (420), 3.462 (50) (002), 3.207 (32) (031), 2.811 (40) (412).

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Ponomarev, Igor V., Ludmila D. Shakina, Sergey B. Topchiy, Svetlana V. Klyuchareva, and Alexandra E. Pushkareva. "Treatment of pyogenic granuloma with copper vapor laser radiation." Vestnik dermatologii i venerologii 97, no. 2 (2021): 41–49. http://dx.doi.org/10.25208/vdv1209.

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Background. Pyogenic granuloma (PG) or lobular capillary hemangioma, ICD10 code: L98.0. appears as a single bright red or violet papule up to 20 mm in size, on the face, fingers, skull surface, arms, and intergluteal fold, as well as on the oral mucous membranes. Surgical removal of facial PG is not always possible due to insufficient thickness of the dermis. Treatment of PG with a pulsed dye laser (PDL) or neodymium laser (Nd:YAG) can achieve a noticeable elimination of the lesion but is reported to be accompanied by such side effects as purpura or scarring. It determines the feasibility of introducing into clinical practice the methods of laser treatment of PG using the radiation of a copper vapor laser (CVL) with a wavelength of 578 nm, which effectively absorbed by the blood. Aim. The assessment of the clinical efficacy and safety of the CVL treating PG. Methods. 26 adult patients with PG in various parts of the face, including the lips, limbs, and trunk, were included in this study. PG treatment was carried out in one session with CVL (Yakhroma-Med, FIAN) at an average power of 0.71.0 W, at a wavelength of 578 nm, exposure time 0.20.3 s. The diameter of the light spot is 1 mm. Results. Immediately after the single laser treatment, the PG involved area became grey. In 710 days, the irradiated area was utterly similar to the adjacent intact skin. No postoperative bleeding or infection was noted. Side effects included mild skin atrophy. During the follow-up observation for five years, no side effects were found. Conclusion. The high efficiency of PG elimination using CVL in the absence of pronounced side effects allows suggesting this method for introducing into dermatologists and cosmetologists' clinical practice as a highly effective and inexpensive method of treatment.

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Jumean, Fawwaz, Magdy El-Dakiky, Adnan Manassra, Manal Abdul Kareem, Mohammad Abu Alhaj, and Mustafa Khamis. "Complexing Properties of Acid Alizarin Violet with Copper, Cobalt and Nickel in Micellar Media Containing SDS, CTAB and TX-100." American Journal of Analytical Chemistry 05, no. 01 (2014): 1–7. http://dx.doi.org/10.4236/ajac.2014.51001.

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Ozkantar, Nebiye, Erkan Yilmaz, Mustafa Soylak, and Mustafa Tuzen. "Pyrocatechol violet impregnated magnetic graphene oxide for magnetic solid phase microextraction of copper in water, black tea and diet supplements." Food Chemistry 321 (August 2020): 126737. http://dx.doi.org/10.1016/j.foodchem.2020.126737.

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Nashed, Mohamad-Nour, Dorothy Hardy, Theodore Hughes-Riley, and Tilak Dias. "A Novel Method for Embedding Semiconductor Dies within Textile Yarn to Create Electronic Textiles." Fibers 7, no. 2 (2019): 12. http://dx.doi.org/10.3390/fib7020012.

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Electronic yarns (E-yarns) contain electronics fully incorporated into the yarn’s structure prior to textile or garment production. They consist of a conductive core made from a flexible, multi-strand copper wire onto which semiconductor dies or MEMS (microelectromechanical systems) are soldered. The device and solder joints are then encapsulated within a resin micro-pod, which is subsequently surrounded by a textile sheath, which also covers the copper wires. The encapsulation of semiconductor dies or MEMS devices within the resin polymer micro-pod is a critical component of the fabrication process, as the micro-pod protects the dies from mechanical and chemical stresses, and hermetically seals the device, which makes the E-yarn washable. The process of manufacturing E-yarns requires automation to increase production speeds and to ensure consistency of the micro-pod structure. The design and development of a semi-automated encapsulation unit used to fabricate the micro-pods is presented here. The micro-pods were made from a ultra-violet (UV) curable polymer resin. This work details the choice of machinery and methods to create a semi-automated encapsulation system in which incoming dies were detected then covered in resin micro-pods. The system detected incoming 0402 metric package dies with an accuracy of 87 to 98%.

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Ramrakhiani, Meera, and Sakshi Sahare. "Photo-and Electro-Luminescence in Copper Doped Zinc Sulphide Nanoparticles and Nanocomposites." Solid State Phenomena 201 (May 2013): 181–96. http://dx.doi.org/10.4028/www.scientific.net/ssp.201.181.

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Copper doped Zinc Sulfide (ZnS:Cu)) is a known green light emitter. Present paper reports luminescence of ZnS:Cu nanoparticles and nanocomposites. Three different nanostructures: mercaptoethanol capped ZnS:Cu nanoparticles, polyvinyl alcohol (PVA) capped ZnS:Cu nanoparticles and ZnS:Cu/PVA nanocomposites have been prepared by chemical route. X-ray diffraction (XRD) revealed cubic zinc blende structure of ZnS:Cu nanocrystals of size below 20 nm. The particle size is found to decrease with increasing capping agent concentration or ZnS loading in PVA matrix. Optical absorption spectra show blue shift in the absorption edge indicating quantum size effect. Photoluminescence (PL) of all the samples was studied by exciting with 212 nm light. The PL spectra of ZnS:Cu/ PVA nanocomposite films show quite broad emission peak at 415 nm where as the PL spectra of mercaptoethanol capped and PVA capped nanoparticles show a very narrow peak at 426 nm and 403 nm respectively. It seems that the nature of passivation of surface states affects the position of surface states. Electroluminescence (EL) studies have shown that light emission starts at a threshold and then increases with voltage. Higher EL intensity and lower threshold voltage is obtained in case of smaller particles. The EL spectra of all the samples are found to be broad with peak at about 420 nm. The EL intensity of ZnS:Cu/PVA nanocomposites is much larger than the ZnS:Cu nanoparticles. The high efficiency EL devices for display and lighting can be fabricated using ZnS:Cu nanocomposites with PVA matrix giving violet emission.

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Journal articles on the topic 'Violet copper'

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