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- W62652224 abstract "There is continuing interest in the synthesis and characterization of transition metal complexes with benzotriazole ligands. This is primarily due to the anticorrosion activity of benzotriazole (btaH) towards certain metals, particularly Cu and its alloys. The molecular mechanisms for the corrosion inhibition of metals by benzotriazoles have not been completely elucidated. An inorganic chemistry model approach to the corrosion inhibition of Fe by btaH has been developed in the present Diploma Thesis.Complexes [FeCl3(Mebta)2] (1), [FeCl3(btaH)2] (2), (Et3NH)[Fe14O9(OMe)9Cl9(bta)7(MeOH)2(H2O)2] (3), [FeCl3(5ClbtaH)2].2(5ClbtaH) (4), [FeCl3(5,6dimebtaH)2] (5), [FeBr3(btaH)2] (6), [Fe14O8(OH)(OMe)9Br9(bta)7(MeOH)2(H2O)2].2MeOH (7.2MeOH) and {(5ClbtaH)2H}[FeBr4] (8), where Mebta = 1- methylbenzotriazole, 5ClbtaH = 5-chlorobenzotriazole and 5,6dimebtaH = 5,6-dimethylbenzotriazole, have been prepared. The complexes have been characterized using microanalyses and IR spectroscopy. The molecular and crystal structures of the compounds have been determined by single-crystal X-ray crystallography. Complexes 1, 2 and 4-6 are mononuclear with five monodentate ligands (three halogenido, two N-donors). The FeIII ion is in a trigonal bipyramidal coordination environment with the three halogenido ligands defining the equatorial plane. Compound 8 is ionic, containing the novel {(5ClbtaH)2H}+ cation and the tetrahedral [FeBr4]- ion. The cluster anion of 3 is held together by six κ3-O2-, three κ4-O2-, nine κ2-OMe-, five e1:e1:e1:κ3 bta- and two e1:e1:κ2 bta- ligands. Peripheral ligation is completed by nine Cl-, two MeOH and two H2O terminal ligands. The FeIII centers adopt three different coordination geometries (octahedral, trigonal bipyramidal, tetrahedral). The 14 FeIII centers define a hexacapped hexagonal bipyramid. The cluster molecule of 7.2MeOH has a similar structure; one κ3-O2- of 3 has been replaced by a unique κ3-OH- in 7.2MeOH.The tetradecanuclear clusters 3 and 7.2MeOH may be considered as models for the corrosion inhibition of Fe by benzotriazoles at neutral pHs, while the crystal structure of 8 gives a clue for the molecular mechanism of the anticorrosion properties of selected benzotriazoles towards iron at acidic pHs.Complexes 2 and 4 are effective homogeneous catalysts for alkane and alkene oxidations with the eco-friendly oxidant H2O2.ivThe present work can be also considered as a contribution in the coordination chemistry of benzotriazoles and in the cluster chemistry of FeIII." @default.
- W62652224 created "2016-06-24" @default.
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- W62652224 date "2011-07-19" @default.
- W62652224 modified "2023-09-28" @default.
- W62652224 title "Σύμπλοκες ενώσεις του σιδήρου με το βενζοτριαζόλιο και τα υποκατεστημένα παράγωγά του ως υποκαταστάτες : σύνθεση, δομικός χαρακτηρισμός, φασματοσκοπική μελέτη, καταλυτική δραστικότητα και χρησιμοποίησή τους ως μοντέλα της παρεμπόδισης της διάβρωσης του μετάλλου από βενζοτριαζολικούς παρεμποδιστές" @default.
- W62652224 hasPublicationYear "2011" @default.
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