Rare earth 3-(4′-hydroxyphenyl)propionate complexes

Abstract

Structural variation of lanthanoid 3-(4′-hydroxyphenyl)propionates and investigation of the anti-corrosion properties of lanthanum 3-(4′-hydroxyphenyl)propionate are presented, highlighting lanthanoid contraction and the importance of the –CHCH− structural unit of 4-hydroxycinnamates in corrosion mitigation.

Synthesis and Structures of Rare Earth 3-(4′-Methylbenzoyl)-propanoate Complexes – New Corrosion Inhibitors

“…Overall, the , RE-O . bond lengths of the aqua complexes are in excellent agreement with the corresponding values of Ce or Nd atoms of the same coordination numbers in [Ce 2 (hpp) 6 (H 2 O) 3 ] and [NaNd(hpp) 7 (H 2 O)(MeOH)] [13] complexes, where the mbp chain can be viewed as a functionalised hpp (Ligand C, Fig. 1).…”

“…General IR spectra were collected as solid samples using an Agilent Cary 630 attenuated total reflectance (ATR-IR) spectrometer between 4000 and 600 cm À1 . 1 H and 13 Na(mbp) 3-(4 0 -Methylbenzoyl)propanoic acid (0.89 g, 4.7 mmol) was neutralised with sodium hydrogen carbonate (0.39 g, 4.7 mmol) in a mixture of ethanol (EtOH) and water (1 : 1 v/v). Upon 3486wbr, 3027vw, 2915wbr, 1695m, 1678m, 1589s, 1557s, 1433s, 1399s, 1356m, 1297m, 1256w, 1239m, 1218w, 1202m, 1179m, 1110w, 1080w, 1063w, 1038w, 1018w, 994w, 976w 3514wbr, 3463wbr, 3058vw, 3026vw, 2913wbr, 1683m, 1670m, 1605m, 1572m, 1551s, 1531s, 1518m, 1431s, 1405s, 1356m, 1300w, 1240m, 1200m, 1186m, 781w, 976w, 950w, 890m, 863w, 845w, 812s, 787w, 1695m, 1675m, 1630w, 1607m, 1572m, 1542s, 1423m, 1400s, 1356s, 1300m, 1268w, 1240m, 1203m, 1179m, 1148w, 1110w, 1078w, 1062w, 1040vw, 1011w, 991w, 970m, 894m, 884w 3460wbr, 3027vw, 2915w, 2900w, 1693m, 1675m, 1631w, 1605m, 1576s, 1553s, 1428s, 1400s, 1357s, 1295s, 1264w, 1239m, 1217vw, 1202m, 1181s, 1149vw, 1109vw, 1018w, 970w, 957w, 946vw, 886w, 855w, 813m, 807s, 791m…”

“…1) is much less effective than lanthanum 4-hydroxycinnamate, thereby establishing the importance of the cinnamate double bond in corrosion inhibition. [13] Rare earth 3-(4 0 -methylbenzoyl)propanoate (mbp) * This paper is dedicated to our colleague and friend Professor Len Lindoy on the occasion of his 80th birthday. (4-(4 0 -methylphenyl)-4-oxobutanoate) (Ligand D, Fig.…”

New EuIII Pyromellitic Metal–Organic Framework of Intense Red-Orange Luminescence and High Thermal Stability for Marking in Gunshot Residues

“…Thus, considering one Hbtec 3− anion, these coordination modes are described by each carboxylate group, separately. 55 As can be seen in Figure 5c, the Hbtec 3− ligand is simultaneously connected to five Eu III ions, acting as a μ 5 -bridging ligand and exhibiting three coordination modes: two carboxylates in a μ 2 -η 1 :η 2 chelating/bridging mode and other two carboxylate groups in η 2 chelating and η 1 monodentate fashions, as suggested by vibrational spectroscopy. The literature reports several examples of metal−organic frameworks derived from 1,2,4,5-benzenetetracarboxylic acid with transition metals, 56−60 and in less quantity with lanthanide III ions.…”

Metal-free coumarate based ionic liquids and poly(ionic liquid)s as corrosion inhibitors

“…7,9,10 From this past work, it is evident that the aromatic carboxylate, p-coumarate, provides very efficient inhibition. 2,[11][12][13][14] For instance, when comparing lanthanum 3-(4 0 -hydroxyphenyl)propionate with lanthanum ( p-coumarate) 3 , Deacon et al demonstrated that the coumarate with the unsaturated double bond in the side group provides better surface passivation than the aliphatic propionate group. 12 In fact, it is reported that the carboxylate group has the ability to create a hydrogen bond with the hydroxide groups of the surface, that contributes to the formation of surface complexes which acts as a barrier against corrosion.…”