Langmuir–Blodgett films of salophen-based metallosurfactants as surface pretreatment coatings for corrosion mitigation

Abstract

Salophen-based metallosurfactants are successfully used as pretreatment LB films for corrosion mitigation in acidic and saline media. Passivation of electron transfer is clearly demonstrated in gold electrodes, while 99.5% iron substrates treated with such films show up to an impressive 30% corrosion mitigation.

A Molecular Approach for Mitigation of Aluminum Pitting based on Films of Zinc(II) and Gallium(III) Metallosurfactants

“…[18] CV of 1 and 2 were performed in 1.0 10 À3 mol L À1 CH 2 Cl 2 solution using TBAPF 6 as as upporting electrolyte. Potentials were recorded versust he Fc + /Fc couple.T he CV of 1 was recorded previously [17] and displays well-behaved oxidationp rocesses at 0.22 V Fc/Fc + (DE p = 0.78 V, j I pa /I pc j = 0.9) anda t 0.56 V Fc/Fc + (DE p = 0.16 V, j I pa /I pc j = 1.2). Species 2 showed similar features at 0.43 and 0.77 V Fc/Fc + (DE p = 0.10 and 0.22 V, respectively,F igure 2).…”

“…At otal of 50 layerso fL B-films were deposited keeping the transfer ratio close to unity andu sing aY -type dipping method. Data was collected using p-polarizedl ight at respective angles of incidence of 20 and 408 for 1 and 2.W hile the resultsf or 1 were previously discussed, [17] 2 displayed asymmetric ands ymmetric CÀHs tretching vibrations at ca. 2860-2960 cm À1 .T he slight shift in the asymmetricC ÀHs tretching vibrations in LB film compared to bulk correlates wellw ith previous studies.…”

“…The ligands H 2 L N 2 O 2 ,H 3 L N 2 O 3 and the Zn II species 1 were synthesized asp reviously described. [17,18] The Ga III species 2 was obtainedb yt reating one equivalento ft he ligand H 3 L N 2 O 3 with one equivalent of GaCl 3 in the presenceo ft hree equivalents of NaOCH 3 in aM eOH/CH 2 Cl 2 mixture under inert conditions (Figure S1, Supporting Information). The associated mass spectrum showedapeak at m/z = 977.55 attributed to [Ga III L N 2 O 3 + H + ] + in MeOH and elemental analysis is in excellent agreement with the calculated compositionf or 2.T he FTIR and UV/Vis spectroscopies confirm the amine character of the species (see Figures S2 and S3 and Ta bles S1 and S2, Supporting Information), as expected for complexes synthesized under anaerobic conditions.…”

“…This observation is similar to other structurally related metal/phenolate systems. [17,18] Pitting is particularly pronounced in Al j metal junctions [29] and in order to optimize electron passivation,f ilms containing an increasing number of LB layers were probed by CV experiments with 1.0 10 À3 m K 3 [Fe III (CN) 6 ]i n0 .1 m KCl aqueous solution at room temperature. The idea is to investigate how many layers are necessary to completely avoid electron transfer from an electrode to ag ood acceptors uch as an Fe III complex in a redox process given by [Fe III (CN) 6 ] 3À + 1e À !…”

Metallosomes for biomedical applications by mixing molybdenum carbonyl metallosurfactants and phospholipids

“…This is an attractive idea that has been studied with a broad range of different aims (anticancer agents, 2 antimicrobial compounds, 2,3 catalysis, 4 corrosion mitigation, 5 labelling phospholipid membranes, 6 light-driven hydrogen generation, 7 magnetic resonance imaging, 8 metallomesogens, 9 nanoparticles, 10 optoelectronic devices, 11 and templates for mesoporous materials 12 ) as well as being reviewed from different points of view.…”