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Relevant bibliographies by topics / Complexes de zinc

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Academic literature on the topic 'Complexes de zinc'

Author: Grafiati

Published: 23 November 2024

Last updated: 19 July 2025

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Journal articles on the topic "Complexes de zinc"

1

Nabeshima, Tatsuya, Yusuke Chiba, Takashi Nakamura, and Ryota Matsuoka. "Synthesis and Functions of Oligomeric and Multidentate Dipyrrin Derivatives and their Complexes." Synlett 31, no. 17 (2020): 1663–80. http://dx.doi.org/10.1055/s-0040-1707155.

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The dipyrrin–metal complexes and especially the boron complex 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) have recently attracted considerable attention because of their interesting properties and possible applications. We have developed two unique and useful ways to extend versatility and usefulness of the dipyrrin complexes. The first one is the linear and macrocyclic oligomerization of the BODIPY units. These arrangements of the B–F moieties of the oligomerized BODIPY units provide sophisticated functions, such as unique recognition ability toward cationic guest, associated with changes in the photophysical properties by utilizing unprecedented interactions between the B–F and a cationic species. The second one is introduction of additional ligating moieties into the dipyrrin skeleton. The multidentate N2Ox dipyrrin ligands thus obtained form a variety of complexes with 13 and 14 group elements, which are difficult to synthesize using the original N2 dipyrrin derivatives. Interestingly, these unique complexes exhibit novel structures, properties, and functions such as guest recognition, stimuli-responsive structural conversion, switching of the optical properties, excellent stability of the neutral radicals, etc. We believe that these multifunctional dipyrrin complexes will advance the basic chemistry of the dipyrrin complexes and develop their applications in the materials and medicinal chemistry fields.1 Introduction2 Linear Oligomers of Boron–Dipyrrin Complexes3 Cyclic Oligomers of Boron–Dipyrrin Complexes4 A Cyclic Oligomer of Zinc–Dipyrrin Complexes5 Group 13 Element Complexes of N2Ox Dipyrrins6 Chiral N2 and N2Ox Dipyrrin Complexes7 Group 14 Element Complexes of N2O2 Dipyrrins8 Other N2O2 Dipyrrin Complexes with Unique Properties and Functions9 Conclusion

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Schäfer, Sebastian, Ralf Köppe, Michael T. Gamer, and Peter W. Roesky. "Zinc–silylene complexes." Chemical Communications 50, no. 77 (2014): 11401. http://dx.doi.org/10.1039/c4cc04714a.

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Nieuwenhuizen, Peter J. "Zinc accelerator complexes." Applied Catalysis A: General 207, no. 1-2 (2001): 55–68. http://dx.doi.org/10.1016/s0926-860x(00)00613-x.

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Midlej, Victor, Felipe Rubim, Wilmer Villarreal, et al. "Zinc-clotrimazole complexes are effective against Trichomonas vaginalis." Parasitology 146, no. 9 (2019): 1206–16. http://dx.doi.org/10.1017/s003118201900043x.

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AbstractTrichomonas vaginalis is a protozoan parasite that causes trichomoniasis in humans, the most prevalent non-viral sexually transmitted disease (STD). Imidazole compounds are used for the treatment of trichomoniasis, and metronidazole is the most commonly prescribed. However, these compounds can lead to parasite resistance and unwanted side effects. Therefore, there is a need for an alternative treatment for this disease. Here, we explored the potential of clotrimazole (CTZ) and zinc compounds, as well as CTZ complexed with zinc salts ([1] acetate [Zn(CTZ)2(Ac)2] and [2] a chloride [Zn(CTZ)2Cl2] complexes) against T. vaginalis. We synthesized the zinc complexed CTZ compounds and determined their concentration values that inhibited parasite growth by 50% (IC50). We used scanning and transmission electron microscopy to visualize the ultrastructural alterations induced by CTZ and their zinc complexes. The incubation of the parasites with [Zn(CTZ)2(Ac)2] complex inhibited their growth, yielding an IC50 of 4.9 µm. Moreover, there were changes in the shape of treated parasites, including the formation of surface projections that subsequently detached from the cell, in addition to changes in the hydrogenosomes, endoplasmic reticulum and Golgi complex. We found [Zn(CTZ)2(Ac)2] to be a highly effective compound against T. vaginalis in vitro, suggesting its potential utility as an alternative chemotherapy for trichomoniasis.

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Tau, Prudence, Abimbola O. Ogunsipe, Suzanne Maree, M. David Maree, and Tebello Nyokong. "Influence of cyclodextrins on the fluorescence, photostability and singlet oxygen quantum yields of zinc phthalocyanine and naphthalocyanine complexes." Journal of Porphyrins and Phthalocyanines 07, no. 06 (2003): 439–46. http://dx.doi.org/10.1142/s1088424603000562.

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The effects of formation of cyclodextrin inclusion complexes on the photochemical and photophysical properties of zinc phthalocyanine ( ZnPc ) and various peripherally substituted zinc phthalocyanines as well as zinc naphthalocyanine ( ZnNPc ) are investigated. The cyclodextrins employed were the hydroxypropyl-γ-cyclodextrin and unsubstituted β-cyclodextrin. Job's plots were employed to confirm the stoichiometry of the inclusion complexes and showed 2:1 and 4:1 (cyclodextrin:phthalocyanine) inclusion behavior. The phthalocyanine inclusion complexes showed larger singlet oxygen quantum yield (ϕΔ) values when compared to the free phthalocyanines before inclusion, for complexes 1 (zinc naphthalocyanine), 2 (zinc tetranitrophthalocyanine) and 4 (zinc tetra-tert-butylphenoxyphthalocyanine). The fluorescence quantum yields generally remained unchanged following inclusion.

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Oh, Shin Bi, Jung Ah Kim, SuJi Park та Joo-Yong Lee. "Associative Interactions among Zinc, Apolipoprotein E, and Amyloid-β in the Amyloid Pathology". International Journal of Molecular Sciences 21, № 3 (2020): 802. http://dx.doi.org/10.3390/ijms21030802.

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Zinc and apolipoprotein E (apoE) are reportedly involved in the pathology of Alzheimer’s disease. To investigate the associative interaction among zinc, apoE, and amyloid-β (Aβ) and its role in amyloid pathogenesis, we performed various biochemical and immunoreactive analyses using brain tissues of Tg2576 mice and synthetic Aβ and apoE peptides. On amyloid plaques or in brain lysates of Tg2576 mice, apoE and Aβ immunoreactivities increased after zinc chelation and were restored by its subsequent replacement. Zinc depletion dissociated apoE/Aβ complexes or larger-molecular sizes of Aβ oligomers/aggregates into smaller-molecular sizes of apoE and/or Aβ monomers/complexes. In the presence of zinc, synthetic apoE and/or Aβ peptides aggregated into larger-molecular sizes of oligomers or complexes. Endogenous proteases or plasmin in brain lysates degraded apoE and/or Aβ complexes, and their proteolytic activity increased with zinc depletion. These biochemical findings suggest that zinc associates with apoE and Aβ to encourage the formation of apoE/Aβ complexes or large aggregates, raising the deposition of zinc-rich amyloid plaques. In turn, the presence of abundant zinc around and within apoE/Aβ complexes may block the access or activity of Aβ-degrading antibodies or proteases. These results support the plausibility of chelation strategy aiming at reducing amyloid pathology in Alzheimer’s disease.

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A., K. BANERJEE, K. GHOSH MONOJIT, K. SINHA SAILENDRA, and K. ROY S. "Alkali Metal Complexes. Binuclear Alkali Metal Complexes with Magnesium(II) and Zinc(II) Acetylacetonates." Journal of Indian Chemical Society Vol. 62, Apr 1985 (1985): 272–74. https://doi.org/10.5281/zenodo.6324541.

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Chemistry Department, Patna University, Patna-800 005 <em>Manuscript received 16 June 1983, accepted 30 April 1985</em> Heterobinuclear alkali metal complexes have been synthesised by treating metal chelates of magnesium and zinc acetylacetonates with alkali metal salts of 1-nitroso-2-naphthol and 8-hydroxyquinoline in ethanol/benzene-ethanol mixture. The general formula of the complex has been established as [M<sub>α </sub>(acac)<sub>2</sub> M<sub>b</sub>L], where M<sub>α</sub> -magnesium or zinc, acac<em>- </em>acetylacetonate, and M<sub>b</sub>L -Li, Na and K salt of 1-nitroso-2-naphthol and 8-hydroxyquinoline. The infrared stretching bands of C ―O in adducts reveal the presence of bridged and unbridged oxygen atoms, and the bridging has been assigned to be due to attachment of oxygen atoms with alkali metal ions.

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Müller-Hartmann, A., and H. Vahrenkamp. "Binary zinc-oligophosphate complexes." Inorganica Chimica Acta 300-302 (April 2000): 531–36. http://dx.doi.org/10.1016/s0020-1693(99)00614-3.

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Meyer, Nils, and Peter W. Roesky. "Chiral Aminotroponiminate Zinc Complexes." Organometallics 28, no. 1 (2009): 306–11. http://dx.doi.org/10.1021/om800858t.

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Datta, Simmi, Michael T. Gamer, and Peter W. Roesky. "TADDOLate complexes of zinc." Dalton Transactions, no. 13 (2008): 1761. http://dx.doi.org/10.1039/b715123c.

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Dissertations / Theses on the topic "Complexes de zinc"

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Doerrer, Linda H. (Linda Helen) 1968. "Cobalt, zinc, and cadminum tropocoronand complexes." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43296.

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Tirel, Emmanuel. "Zinc complexes for phosphate diester hydrolysis." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7788/.

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This work focuses on catalysing the hydrolysis of DNA-like substrate with mononuclear zinc complexes. Particular attention is given to find new ways of activating the nucleophile of the reaction and to study the impact of organic groups that affect the microenvironment of the metal ion.

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Moreton, A. D. "Structure and reactivity of some aqueous zinc complexes." Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375179.

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Gianopoulos, Christopher G. "Development of Bulky Dipyrromethene Complexes of Aluminum, Zinc, and Rhodium." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418317025.

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Pratt, Jo-Anne Margaret. "The development of zinc (II) selective fluorescent ligands /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09php915.pdf.

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Elrod-Erickson, Monica (Monica Ann) 1969. "Structural and biochemical studies of zinc finger-DNA complexes." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/49650.

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Ritch, Grayson D. "Synthesis, Characterization, and Reactivity of Novel Zinc Coordination Complexes." Kent State University Honors College / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1399675758.

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Dollberg, Christopher Lawrence. "Zinc and ruthenium quinone diimine complexes synthesis and photophysical properties /." Columbus, Ohio Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1071171484.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xvii, 171 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Claudia Turro, Dept.of Chemistry. Includes bibliographical references (p. 168-171).

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Tabone, Roberta. "Sinthesys of heteroleptic zinc complexes for imaging in living cells." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19188/.

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This thesis arose from an interest in luminescence heteroleptic bis(dipyrrinato) Zn (II) complexes and their application in cell imaging, due to their attractive and fascinating characteristics. Among imaging technologies, near-infrared fluorescence imaging has been dedicated immense attention owing to its low absorption and autofluorescence from surrounding organism and tissues in this specific spectral region, which minimize background interference and improve tissue depth penetration. An ideal near-infrared probe should be equipped with excellence chemical and photophysical properties. The target of this work is the synthesis of new heteroleptic bis(dipyrrinato) Zn (II) complexes having two main features: the emission in the near-infrared region and water-solubility. In order to purse these intentions, the low-energy emission was achieved by expansion of π-conjugation of simple dipyrrins using Knoevenagel condensation106 and tri(ethylene)glycol chain was introduced to increase the water solubility of the final complex. Photophysical and luminescent properties of the new complexes were investigated. Finally, with a view to a potential biological use of these new complexes in biological environments, their biocompatibility was tested using a cell viability assay: (3-(4,5-dimethylthiazol-2-yl)-2’-5’-diphenyltetrazolium bromide (MTT) assay.

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Yang, Wen Yu. "Luminescent zinc and lanthanide complexes based on 2,2 '-dipyridylamine derivatives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0020/MQ52968.pdf.

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Books on the topic "Complexes de zinc"

1

McMaster, Jonathan. Copper and Zinc complexes of bi-imidazole ligands. University of Manchester, 1995.

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Coleman, A. P. Spectroscopic aspects of alkyl complexes of zinc, cadmium and mercury. University of East Anglia, 1990.

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Bhalla, Rajiv. Copper and zinc complexes of Bis- and Tris-imidazole ligands. University ofManchester, 1995.

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1941-, Rainsford K. D., ed. Copper and zinc in inflammatory and degenerative diseases. Kluwer Academic Publishers, 1998.

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Ferraz de Paiva, Raphael Enoque. Gold(I,III) Complexes Designed for Selective Targeting and Inhibition of Zinc Finger Proteins. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00853-6.

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Shlian, Daniel. Synthesis, Structures, and Reactivity of Zinc, Cadmium, and Magnesium Complexes Supported by Nitrogen Donor and Carboxylate Ligands. [publisher not identified], 2022.

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Sattler, Wesley Ian. (I) Zinc complexes as synthetic analogues for carbonic anhydrase and as catalysts for H₂ production and CO₂ functionalization . . . [publisher not identified], 2012.

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Christenson, Scott C. Contamination of wells completed in the Roubidoux aquifer by abandoned zinc and lead mines, Ottawa County, Oklahoma. U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Christenson, Scott C. Contamination of wells completed in the Roubidoux aquifer by abandoned zinc and lead mines, Ottawa County, Oklahoma: [microform]. U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Christenson, Scott C. Contamination of wells completed in the Roubidoux aquifer by abandoned zinc and lead mines, Ottawa County, Oklahoma: [microform]. U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Book chapters on the topic "Complexes de zinc"

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Meyer, B. K. "Bound Exciton Complexes." In Zinc Oxide. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10577-7_7.

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Sukumar, Ethirajan, Vajiravelu Sivamurugan, and E. Rajkumar. "Unique Complexes of Zinc and Their Applications." In Zinc. CRC Press, 2024. http://dx.doi.org/10.1201/9781003412472-15.

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Kimura, Eiichi, Tohru Koike, and Mitsuhiko Shionoya. "Advances in Zinc Enzyme Models by Small, Mononuclear Zinc (II) Complexes." In Metal Sites in Proteins and Models. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/3-540-62874-6_7.

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Bochmann, Manfred, Gabriel Bwembya, Kevin J. Webb, M. A. Malik, J. R. Walsh, and P. O'Brien. "Arene Chalcogenolato Complexes of Zinc and Cadmium." In Inorganic Syntheses. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132623.ch5.

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Claridge, R. F. C. "1.26 Zinc-centered radicals." In Inorganic Radicals, Metal Complexes and Nonconjugated Carbon Centered Radicals. Part 1. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-48466-0_28.

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Howard, J. A. "2.16 Zinc-centered radicals." In Inorganic Radicals, Metal Complexes and Nonconjugated Carbon Centered Radicals. Part 1. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-48466-0_67.

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Sorenson, J. R. J. "Copper complexes in the treatment of experimental inflammatory conditions: inflammation, ulcers and pain." In Copper and Zinc in Inflammation. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2619-6_6.

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Beveridge, S. J. "Copper therapy of inflammatory disorders: efficacy and biodistribution of topically applied copper complexes." In Copper and Zinc in Inflammation. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2619-6_7.

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Kimura, Eiichi. "Macrocyclic Polyamine Zinc(II) Complexes as Advanced Models for Zinc(II) Enzymes." In Progress in Inorganic Chemistry. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166420.ch6.

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Sorenson, J. R. J. "Copper complexes for therapy of cancer and autoimmune diseases." In Copper and Zinc in Inflammatory and Degenerative Diseases. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3963-2_7.

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Conference papers on the topic "Complexes de zinc"

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Wang, Xin, Zhaoyi Dai, Yue Zhao, et al. "Zinc Sulfide Solubility Modeling in Aqueous Solution at High Temperature, Pressure, and Ionic Strength." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17763.

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Abstract In this study, the solubility of zinc sulfide has been collected from the literature at pH 2 to 11, temperature 23 to 250 °C, pressure 0.6 to 150 bar, and ionic strength 0 to 4.6 m. A solubility model has been developed based on the combination of Pitzer theory calculated activity coefficient and speciation of the Zn-HS-OH-Cl aqueous system. In total, around 230 solubility data were collected as the input database, the model was fitted in Matalab 2020a with the particle-swarm optimization. The updated model is able to predict the ZnS solubility saturation index (SI) with 95% confidence interval 0.04 SI unit, which suggested good accuracy under model conditions. Due to the extremely low solubility of the ZnS itself, these errors correspond to only around 0.07 ppm of [Zn(II)], which is less than the error of measurement for field samples. For all pH conditions, Zn-HS complexes and Zn-Cl complexes have strong influence on the aqueous soluble zinc solubility. This new model with accurate ZnS solubility prediction will help field operators to better control the ZnS scaling and corrosion problem.

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Mangalagiu, Violeta, Dorina Amariucai-Mantu, Dumitrela Diaconu, and Vasilichia Antoci. "BENZIMIDAZOLE � PYRIDINE: A NEW TYPE OF HGHLY SENSITIVE CHEMOSENSOR FOR ZN2+." In SGEM International Multidisciplinary Scientific GeoConference. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024v/6.2/s23.01.

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Discovery of new chemosensors for M2+ cations represent a continuously and challenging issue for researcher because of their potential applications in nano and micro technologies. Among the other metals, zinc is the second most abundant transition metal ion in human body and plays a crucial role in many biological and environmental processes. In this work we present the design, synthesis and characterization of a Zn2+ chemosensors and its coordination complexes based on podants with benzimidazole - pyridine skeleton. The new chemosensor have in the same molecule a ?�reach heterocycles (benzimidazole) and a p�deficient heterocycles (pyridine) connected via a methylene linker. The complexation ability of our podant with Zn2+ was investigated. The chemosensor proved to be highly sensitive for Zn2+ in the nanomolar range.

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Kawahara, Yuuzou, Yoshirou Umehara, Hidemichi Iizuka, and Koutarou Kikuchi. "Development of Sea Water Hydrostatic Test System for LNG Storage Tank on the Ground." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06068.

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Abstract A sea water hydrostatic test system for LNG storage tanks on the ground that can be completed in a short period of less than one month and whose feature is the cathodic protection of the internal wetted surfaces using Zinc-rich paints has been developed, without any risk of localized corrosion and water pollution. The galvanic corrosion and stress corrosion cracking (SCC) due to welding of different metals of 9 % Ni steel and Ni base weld metal in the internal tank vessel can be prevented by applying inorganic zinc or zinc primer and zinc tape. Their corrosion prevention performance has been confirmed by the sea water immersion test and the salt spray test. By the SCC test and the slow strain rate test (SSRT), the water quality criteria such as H2S concentration, pH value that SCC is not generated in the sea water have been also verified. It has been shown that the corrosion prevention method using zinc-rich paints does not cause any effluent pollution of zinc and this method is an improvement over the conventional cathodic protection method using sacrificial zinc anodes or impressed current cathodic protection.

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Leng, Douglas L., Rodney G. Powers, and Ivan R. Lasa. "Zinc Mesh Cathodic Protection Systems." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00795.

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Abstract Over the years several forms of sacrificial anode cathodic protection systems have been developed and successfully used to provide corrosion control in marine environments. For more than a century cast anodes have been used to protect ship hulls, propellers and other exposed metal objects from corrosion in a purely galvanic mode. However it was not until recently, in the past twenty years, did researchers begin evaluating the potential benefits of applying sacrificial cathodic protection to steel and steel reinforced concrete structures that are environmentally exposed to marine corrosion. In most cases, solid zinc in the form of an expanded metal mesh has been the primary anode material used for controlling corrosion in splash zones of substructures in marine environments. Zinc mesh anodes are manufactured using 99.99% pure special high grade zinc ingot and alloyed with small amounts of trace elements for improving anode performance and creating better formability (see Table 1). The relatively pure composition is essential for the electrochemical behavior of the anode to operate in a purely galvanic mode. The alloying elements are key to controlling intergranular corrosion behavior as well as creating a more workable substrate for processability to an end product. The most recent mesh configuration is a result of several studies related to optimizing critical anode mass and available surface area. The end result is a system that delivers long term, uninterrupted sacrificial cathodic protection to steel and steel reinforced concrete structures in marine environments. In many cases it has been very advantageous to incorporate zinc mesh anodes into basic concrete repair practices; such as integral pile jacketing, for a complete rehabilitation strategy. To date, this has been the most effective and economical way to restore concrete section loss and provide maintenance-free cathodic protection in a single operation. Since these systems operate in a galvanic mode, they are ideal for remote installation sites where maintenance, access and utility sources are not convenient or are unavailable. All the systems discussed in this paper amply supply in excess of 100 mV of polarization.

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Morales, Raquel, Antoni Prieto, Joaquin Ferreiro, and David Morton. "Can You Use a Zinc Rich Primer When Painting Offshore?" In Coatings+ 2020. SSPC, 2020. https://doi.org/10.5006/s2020-00040.

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Abstract Traditional zinc rich primers are the primer of choice during new construction of assets placed offshore for oil & gas production. However, during maintenance, zinc rich primers are not used because of difficulties of having good surface preparation and controlling applied dft to prevent cracking. This paper will examine the performance of new, activated zinc rich epoxy primers compared to conventional zinc rich epoxy primers on steel prepared to different surface profiles using standard techniques of today. Surface preparation is a crucial factor to ensure good performance of coating system in an offshore environment. Both substrate cleanliness and surface profile (influence by the shape of abrasive) will impact the adhesion of the primer which has a direct influence on the performance of the coating system. Testing completed includes: cyclic ageing according to ISO12944-9 (2018), blister box test according to ISO 6270-1 and the impact test according to ISO 6272-1. This testing will show the importance of surface preparation on the ability of the coating system to provide long term corrosion resistance in an offshore environment and on how the choice of zinc rich primer can improve tolerance to poor surface preparation and thus enhance the lifetime of the coating system. Learning objectives Use of activated zinc rich primer for maintenanceImpact of surface preparation standardsImportance of mechanical properties on coating lifetimeLong service life in offshore conditions

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Kim, Chuljung. "A Comparative Study on Coating Performance of Inorganic Zinc Primer System and Inorganic Copolymer System by Long-Term Durability Test Including High Temperature Exposure at 540°C." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18820.

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Abstract Bulk items such as cast and forged valves are commonly to be installed randomly without information on operating conditions. Therefore, inorganic copolymer coating products covering a wide temperature range are applied with a thickness of 250 μm (10 mils) to 300 μm (12 mils). The inorganic zinc coating system is also able to be applied in a wide temperature range, but it is limited to up to 400°C (752°F) due to the zinc melting point of 420°C (788°F). However, if zinc coating is not applied as a topcoat, it may be retarded from being oxidized even at high temperatures. Thus, considering the application of a mixed coating system of inorganic zinc and inorganic copolymer, the complex cycling test of the heating furnace at 540°C (1004°F), QUV exposure, and salt spray was carried out for 3 months to compare with the inorganic copolymer system for coating performance. As a test result, it is confirmed that applying a mixed coating system composed of inorganic zinc and inorganic copolymer to a bulk valve is a suitable and optimal system under various temperature conditions for improving anti-corrosion performance and adhesion performance.

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Felipe, Mary Jane, Sidney Dunn, Timothy Underwood, Monty Pifer, and David Fulmer. "New Eco-Friendly Chemistry for Passivation of Galvanized Coatings." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11532.

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Abstract The use of galvanized systems in the fabrication of cooling towers, varies from industry to industry. Galvanizing provides a zinc coating on the metal substrate. The zinc coating performs as a sacrificial anode, preventing corrosion of the metal substrate. However, control on the formation of white rust should be taken into consideration when using a galvanized system. White rust is characterized by the accumulation of white and fluffy non-protective zinc corrosion product. When kept untreated, white rust corrosion can seriously damage the galvanized zinc coating. Once the zinc layer has been consumed, corrosion of the metal substrate, like mild steel, progresses rapidly shortening the life of the cooling tower. Phosphate passivation is a typical method utilized for protection of galvanized coatings. Passivation of galvanized coatings with phosphate is a complex, time consuming process that often leads to poor passivation. This paper details the use of non-phosphate and non-zinc corrosion inhibitors, able to rapidly passivate and protect galvanized coatings. This newly developed chemistry can also be applied after a utilized galvanized surface has been placed in service (i.e. online passivation), in conditions with heat load, low hardness, high chlorides, and high dissolved solids. Considering the costs of known passivation techniques’, time and impractical water chemistry required, as well as the prevalence of equipment deterioration from white rust, one can immediately appreciate the value of this new, rapid, online passivation chemistry program.

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Horton, A. M. (Mike). "Metallized Zinc Coating on Ductile Iron Pipe – Results of 50 Years of Corrosion Testing in One of the Most Aggressive Soil Environments Found in the United States." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00160.

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Abstract Zinc metallizing with a high purity zinc wire plus a topcoat has been utilized in Europe for external corrosion control of iron pipe for over 65 years and in the United States for over 35 years. This method of external corrosion protection for ductile iron pipe has been under evaluation by the Ductile Iron Pipe Research Association and by North American ductile iron pipe manufacturers since 1975. This paper summarizes 50 years of testing and research of metallic zinc coating on ductile iron pipe (DIP) in one of the most corrosive soils found in the United States – the Florida Everglades. The soil environments in these studies are described as “swampy organic muck” and classified as “uniquely severe” by AWWA(1) Standard C105. They have a resistivity between 80 and 240 ohm-cm, a very high potential for MIC (microbiologically influenced corrosion), and a fluctuating tidal salt/brackish water table. In this severely corrosive environment unprotected DIP with a wall thickness of 0.25” experienced complete wall penetration in less than 3 years and zinc coated DIP in less than 15 years. By comparison, pipe with the combination of metallic zinc used in combination with polyethylene encasement did not experience any penetrations during the studies and indicated an average time to a single penetration of 200+ years.

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Kessler, Richard J., Rodney G. Powers, and Ivan R. Lasa. "Zinc Mesh Anodes Cast into Concrete Pile Jackets." In CORROSION 1996. NACE International, 1996. https://doi.org/10.5006/c1996-96327.

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Abstract A sacrificial anode cathodic protection system has been designed to provide corrosion control to the splash area as well as the submerged portion of reinforced concrete bridge pilings in marine environments. The system consists of a two piece stay in place fiberglass form provided with a internally placed expanded zinc mesh anode and filled with a portland cement-sand mortar to protect the splash area of the pile. The submerged portion of the pile is protected using a standard zinc bulk anode. The experimental system was installed by the Florida Department of Transportation on two corrosion deteriorated piles at the Broward River Bridge in Jacksonville, Florida. The system’s performance was evaluated using NACE established criteria of 100 mV polarization development and polarization decay tests. Results indicate that adequate cathodic protection has been provided to the pile. Current discharged by the mesh anode at various elevations was also measured to further characterize the system’s operational behavior. The system provides cathodic protection and restores concrete lost to corrosion deterioration. It has the advantage of not requiring an external power supply or complex wiring system, and the required maintenance and monitoring is minimal.

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Wehling, J. E. "A Galvanic Zinc-Hydrogel System For Cathodic Protection Of Reinforced Concrete Structures." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99551.

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Abstract Installations of galvanic cathodic protection anodes have been completed on bridge structures in Illinois, Virginia, Florida, Wisconsin, and Oregon, on parking garages in Illinois and Wisconsin, on high voltage transmission tower footings in California, and on condominium balconies in Florida. Some of these installations involve prestressed concrete. The installation of these systems will be described in detail and monitoring data will be presented for at least six months of active service. The system consists of a 10 mil zinc foil bonded to an ionically conductive hydrogel adhesive, which is applied directly to the surface of the steel-reinforced concrete. A copper wire connects the zinc anode to multiple steel rebars and/or strands. The performance is monitored by measuring the current flow in the wire, by measuring the amount of zinc consumed or, more generally, by taking depolarization readings at regular intervals. All of these measurements are an indication of the performance of the galvanic system and the corrosion of the steel rebars that is being prevented.

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Reports on the topic "Complexes de zinc"

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Ruangpornvisuti, Vithaya. Investigation of conformational equilibrium and proton affinity of Thiacalix[4] arenas and their complexes with cations : research report. Chulalongkorn University, 2004. https://doi.org/10.58837/chula.res.2004.35.

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The p-tert-butylsulfonylcalix[4]arene and sulfonycalix[4]arene conformers have been obtained by AM1 geometry optimizations. The structural cavities of p-tert-butylsulfonylcalix[4]arene and sulfonylcalix[4]arene conformers of which phenol groups are bridged by sulfonyl sulfur have been compared to the calix[4]arene and thiacalix[4]arene. The conformational energies of p-tert-butylsulfonylcalix[4]arene have been compared with the energies of sulfonylcalix[4]arene, calix[4]arene and thiacalix[4]arene. The most stable conformer of sulfonylcalix[4]arene and p-tert-butylsulfonylcalix[4]arene are 1,2-alternate and 0011-AAAA 1,2-alternate conformers, respectively. Two different types of hydrogen bond presented in the sulfonyl calix[4]arene cone and partial cone conformers and p-tert-butylsulfonylcalix[4]arene cone conformer have been found. Ab initio energies of the AM1 optimized structures of sulfonylcalix[4]arene and p-tert-butylsulfonylcalix[4]arene conformers and their complexes with zinc(II) have been computed at HF/6-31G* and B3LYP/6-31G* theoretical levels. The optimized structure of complex species of p-tert-butylsulfonylcalix[4]arene with zinc(II) is in good agreement with recent x-ray geometry data.

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Wagner, M. R. NMR investigation of dynamic processes in complexes of nickel(II) and zinc(II) with iminodiacetate, n-methyliminodiacetate and n-ethyliminodiacetate. Office of Scientific and Technical Information (OSTI), 1985. http://dx.doi.org/10.2172/5982240.

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Xie, Weiwei. The role of zinc on the chemistry of complex intermetallic compounds. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1226562.

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Dolan, Cheryl E. Structural and Functional Studies of the Protamine 2-Zinc Complex from Syrian Gold Hamster (Mesocricetus Auratus) Spermatids and Sperm. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/15014805.

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Genther-Schroeder, Olivia N., and Stephanie L. Hansen. Effect of Zinc Amino-Acid Complex and Optaflexx Feeding Duration on Growth Performance and Carcass Characteristics of Finishing Cattle. Iowa State University, 2016. http://dx.doi.org/10.31274/ans_air-180814-562.

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Cross, L. E. Complete Thermodynamic Phenomenologies for Lead Zinc Niobate: Lead Titanate (PZN:PT) and the Lead Magnesium Niobate: Lead Titanate (PMT:PT) Single Crystal System. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada390555.

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Jander, Georg, and Daniel Chamovitz. Investigation of growth regulation by maize benzoxazinoid breakdown products. United States Department of Agriculture, 2015. http://dx.doi.org/10.32747/2015.7600031.bard.

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Introduction Previous research had suggested that benzoxazinoids, a class of defensive metabolites found in maize, wheat, rye, and wild barley, are not only direct insect deterrents, but also influence other areas of plant metabolism. In particular, the benzoxazinoid 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxa- zin-3(4H)- one (DIMBOA) was implicated in: (i) altering plant growth by interfering with auxin signaling, and (ii) leading to the induction of gene expression changes and secondary plant defense responses. The overall goal of this proposal was to identify mechanisms by which benzoxazinoids influence other aspects of plant growth and defense. Specifically, the following hypotheses were proposed to be tested as part of an approved BARD proposal: Benzoxazinoid breakdown products directly interfere with auxin perception Global changes in maize and barley gene expression are induced by benzoxazinoid activation. There is natural variation in the maize photomorphogenic response to benzoxazinoids. Although the initial proposal included experiments with both maize and barley, there were some technical difficulties with the proposed transgenic barley experiments and most of the experimental results were generated with maize. Summary of major findings Previous research by other labs, involving both maize and other plant species, had suggested that DIMBOA alters plant growth by interfering with auxin signaling. However, experiments conducted in both the Chamovitz and the Jander labs using Arabidopsis and maize, respectively, were unable to confirm previously published reports of exogenously added DIMBOA effects on auxin signaling. Nevertheless, analysis of bx1 and bx2 maize mutant lines, which have almost no detectable benzoxazinoids, showed altered responses to blue light signaling. Transcriptomic analysis of maize mutant lines, variation in inbred lines, and responses to exogenously added DIMBOA showed alteration in the transcription of a blue light receptor, which is required for plant growth responses. This finding provides a novel mechanistic explanation of the trade-off between growth and defense that is often observed in plants. Experiments by the Jander lab and others had demonstrated that DIMBOA not only has direct toxicity against insect pests and microbial pathogens, but also induces the formation of callose in both maize and wheat. In the current project, non-targeted metabolomic assays of wildtype maize and mutants with defects in benzoxazinoid biosynthesis were used to identify unrelated metabolites that are regulated in a benzoxazinoid-dependent manner. Further investigation identified a subset of these DIMBOA-responsive compounds as catechol, as well as its glycosylated and acetylated derivatives. Analysis of co-expression data identified indole-3-glycerol phosphate synthase (IGPS) as a possible regulator of benzoxazinoid biosynthesis in maize. In the current project, enzymatic activity of three predicted maize IGPS genes was confirmed by heterologous expression. Transposon knockout mutations confirmed the function of the maize genes in benzoxazinoid biosynthesis. Sub-cellular localization studies showed that the three maize IGPS proteins are co-localized in the plastids, together with BX1 and BX2, two previously known enzymes of the benzoxazinoid biosynthesis pathway. Implications Benzoxazinoids are among the most abundant and effective defensive metabolites in maize, wheat, and rye. Although there is considerable with-in species variation in benzoxazinoid content, very little is known about the regulation of this variation and the specific effects on plant growth and defense. The results of this research provide further insight into the complex functions of maize benzoxazinoids, which are not only toxic to pests and pathogens, but also regulate plant growth and other defense responses. Knowledge gained through the current project will make it possible to engineer benzoxazinoid biosynthesis in a more targeted manner to produce pest-tolerant crops without negative effects on growth and yield.

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Contamination of wells completed in the Roubidoux aquifer by abandoned zinc and lead mines, Ottawa County, Oklahoma. US Geological Survey, 1995. http://dx.doi.org/10.3133/wri954150.

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