Crystal Structure of a Ce^III/Fe^III Heterobimetallic Complex

Abstract

A central μ3—O moiety linking two FeIII and one CeIII sites supported by two distinct heterometallic carboxylate bridging modes features in self‐assembled [CeFe2(bpy)2(μ3—O)(μ—L)2(μ—LH)2(LH)(H2O)2]·0.5(bpy)·7H2O (1) (LH2 = glycolic acid), and the structure models potential bonding modes of the Rare Earth corrosion inhibitor Ce(glycolate)3 to iron or iron oxide.

Synthesis and Characterisation of Rare Earth Complexes Supported by para‐Substituted Cinnamate Ligands

“…From an attempt to grow a Fe/Ce bimetallic compound to model the anticorrosion coating on steel, as previously achieved for salicylate [21] and glycolate [22] systems, crystallisation from a mixture of cerium nitrate, ferric nitrate and sodium-4-hydroxycinnamate in aqueous methanol yielded single crystals of [Ce(4-OHcinn) 3 (MeOH) 2 -(H 2 O)] · MeOH that were suitable for X-ray crystallography. A deliberate synthesis in aqueous methanol yielded the same compound as single crystals in good yield.…”

“…Because of the failure to obtain single crystals of the hydrates, thermo-gravimetric analysis (TGA), IR spectroscopic and X-ray powder diffraction data have been used to provide structural insights. From attempts to prepare Ln/Fe bimetallic (4-Rcinn) complexes, possible intermediates in corrosion protection [21,22], we have crystallised [Ce(4-OHcinn) 3 (MeOH) 2 (H 2 O)] · MeOH and report the structure. The sole reported structure of a lanthanoid 4-substituted cinnamate is that of lanthanum 4-hydroxycinnamate [23].…”

Linear, Zigzag, and Helical Cerium(III) Coordination Polymers

“…At the same time, from a materials properties point of view, polynuclear cerium structures are motivated by their use in, for example, electroluminescence or corrosion inhibition . However, despite the seemingly flexible coordination chemistry, most of the known polynuclear cerium coordination compounds are heterometallic coordination clusters containing Ce IV /Mn III/IV − (including a single-molecule magnet), as well as trinuclear Ce III /Fe III , Ce III /Zn, Ce III /Co, or tetranuclear Mn III /Ce III and Ce III /Co II cores . Only a few homonuclear hexanuclear {Ce IV 6 O 8 } clusters are known so far, and only very recently we reported two giant Ce­(III/IV) clusters comprising {Ce 10 } and {Ce 22 } cores .…”

Analysis of inhibitory properties of Ce‐citrate as a green corrosion inhibitor of low alloy steel in neutral chloride solution

“…Relative effective corrosion inhibitors of steel in neutral chloride were obtained previously by combining the rare earth ions with different types of carboxylates. [19][20][21][22][23][24][25] These inhibitors can suppress both anodic and cathodic reactions (i.e., behave as mixed-type inhibitors) and provide much better corrosion protection than either the rare earth cations or the carboxylate anions. Among carboxylates, cinnamates (3-phenyl propionate and their different derivatives) have shown the best results as good ligands for rare earth cations.…”

“…Among carboxylates, cinnamates (3-phenyl propionate and their different derivatives) have shown the best results as good ligands for rare earth cations. [19][20][21][22][23][24][25] Other combinations of organic ligands such as salicylates, [18,26] acetylacetonate, [27] anthranilates, [28] octylsilanol, [29] and methyl-benzoyl-propanoate [30] with rare earth metals, primarily cerium cations, have been investigated. Recently, carboxylate inhibitors with different alkyl chain lengths as corrosion inhibitors of carbon steel have been tested.…”