1999
DOI: 10.1002/(sici)1521-3773(19990419)38:8<1119::aid-anie1119>3.0.co;2-4
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Surface Coordination Chemistry: Corrosion Inhibition by Tetranuclear Cluster Formation of Iron with Salicylaldoxime

Abstract: A tetranuclear iron cluster is the principal component of the purple coatings produced by treating a mild steel surface with a salicylaldoxime corrosion inhibitor. This was shown by comparison of the spectroscopic data with those of the cluster [{Fe(salH)(HsalH)}4 ], which was obtained from FeCl3 and salicylaldoxime (H2 salH) and has a distorted tetrahedral arrangement of Fe(III) atoms coordinated by terminal (1-) and bridging (2-) salicylaldoximate ligands (the central core of the cluster is depicted).

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Cited by 84 publications
(51 citation statements)
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“…5). The present structure is similar to the [{Fe(salH) (HsalH)} 4 ] [24] but different from the other tetranuclear complexes as it lacks other ancillary bridging ligands such as oxo-, acetato-, etc. It is interesting to note that the X-ray structures of the divalent metals such as nickel, copper, zinc, platinum, and palladium with the same salicylaldoxime or substituted salicylaldoxime ligands result in bis bidentate square planar or distorted trigonal bipyramidal with H 2 O as the fifth ligand while the trivalent metal ions manganese and iron result in tetranuclear clusters.…”
Section: Resultsmentioning
confidence: 99%
“…5). The present structure is similar to the [{Fe(salH) (HsalH)} 4 ] [24] but different from the other tetranuclear complexes as it lacks other ancillary bridging ligands such as oxo-, acetato-, etc. It is interesting to note that the X-ray structures of the divalent metals such as nickel, copper, zinc, platinum, and palladium with the same salicylaldoxime or substituted salicylaldoxime ligands result in bis bidentate square planar or distorted trigonal bipyramidal with H 2 O as the fifth ligand while the trivalent metal ions manganese and iron result in tetranuclear clusters.…”
Section: Resultsmentioning
confidence: 99%
“…The research efforts are driven by a number of considerations. These include the solution of pure chemical problems [2 -4], the desire to provide useful bioinorganic models (oximes may be considered to be reasonable models for the biologically significant imidazole donor group of the amino acid histidine) [5], the development of new oxygen activation catalysts based on nickel(II) polyoximate complexes [6], the application of metal ion/oxime systems as efficient catalysts for the hydrolysis of organonitriles [7] (metal ions can behave as extremely strong activators of RCN molecules towards nucleophilic attack by OH − /H 2 O), the design of Ca 2+ -and Ba 2+ -selective receptors based on site-selective transmetallation of polynuclear zinc(II)/polyoxime complexes [8], the study of metal ion-assisted organic transformations [9], the mecha-0932-0776 / 07 / 0900-1123 $ 06.00 © 2007 Verlag der Zeitschrift für Naturforschung, Tübingen · http://znaturforsch.com nistic investigation of corrosion inhibition by Acorga P5000 (a modern corrosion inhibitor comprising 5-nonylsalicylaldoxime as a mixture of carbon chain isomers) on iron surfaces [10], and the employment of oximate ligands in the synthesis of homo- [1,11] and heterometallic [1,12] clusters and coordination polymers [13] with interesting magnetic properties, including single-molecule magnetism [14 -17] and singlechain magnetism [18].…”
Section: Introductionmentioning
confidence: 99%
“…This has been accomplished from reactions with 2-pyridyl ketone oximes (Scheme 1), part of a longstanding interest by many groups in the structures and properties of transition-metal oxime compounds. [22][23][24][25][26][27][28] We shall also show that the resulting products possess a significant D value, and that this together with a high S value of S ) 6 has led to the products being the first examples of SMMs with a triangular structure. Portions of this work have been previously communicated.…”
mentioning
confidence: 99%