Proton and aluminum-27 nuclear magnetic resonance studies of aluminum(III) perchlorate in N,N-dimethylformamide

Aluminum-27 magnetic resonance of various aluminum complexes has been observed in solution, Aluminum-27 in octahedral complexes shows chemical shifts about 100 ppm higher than 27A1 in tetrahedral complexes. Each type of complex shows a slightly different chemical shift depending upon ligand atoms directly bonded to the metal. Iodo complexes of the type AIL* are exceptional, showing chemical shifts similar to octahedral complexes. Mixed complexes of the type A1X3L (X = Cl, Br; L = (C2H5)20, CeHs) give signals at fields intermediate between octahedral and tetrahedral ones.The line widths are mainly determined by the quadrupole interactions and reflect the symmetry of complexes in solution. Chemical shifts are used along with line widths to identify the chemical species produced by dissolving anhydrous aluminum halides in various organic solvents. In addition, a sequence of the affinities of the ligands to the aluminum ion has been determined as follows:

show abstract

“…Estimated accuracy, ±3 ppm. 6 The line widths refer to the values after field inhomogeneity correction. Estimated accuracy, ±5 Hz. "…”

Section: Methodsmentioning

confidence: 99%

Aluminum complexes in solution as studied by aluminum-27. Nuclear magnetic resonance

Haraguchi¹,

Fujiwara²

1969

J. Phys. Chem.

110

View full text Add to dashboard Cite

show abstract

“…In addition, 13C and 'H NMR studies have shown that amides such as DMF and NMF readily coordinate to A13+ . 24 The amount of Al13 incorporated into the TaS,, and the amount of residual Na+ cations were chemically analysed as a function of different Al13:TaS2 ratios, and the different sonication times used for preparation of the TaS, dispersions. Samples prepared from a 0.2% dispersion and sonicated for either 15 or 45min were flocculated with All, at a molar ratio of 0.06 All, : TaS,.…”

Section: High Loadingmentioning

confidence: 99%

Intercalation of large cluster cations in TaS2

Nazar¹,

Jacobson²

1994

J. Mater. Chem.

View full text Add to dashboard Cite

Optimum conditions for the formation of stable dispersions of Na,TaS, in N-methylformamide-water mixtures have been determined. Under appropriate conditions, the addition of large guest cations to these dispersions results in instantaneous flocculation and the formation of ordered intercalation compounds. The method has been used to prepare intercalation compounds with cobaltocenium cations, A1 and Ga polyoxycations, and a large iron-sulfur cluster cation. Powder X-ray diffraction data from oriented films of the samples were used to obtain one-dimensional projr, actions of the electron density perpendicular to the layers. These electron-density maps provided information on the orientation of the guest species in the interlamellar space.

show abstract

“…The concentration of Al(III) in solution was calculated from the consumed charge according to the anodic reaction (1), assuming a 100% current efficiency. In solution, Al(III) forms solvate complexes in which the central metal is always hexacoordinated ðAlðSÞ 3þ 6 , where S stands for a solvent molecule) [15][16][17][18][19]. Al þ 6S AlðSÞ 3þ…”

Section: Resultsmentioning

confidence: 99%

The influence of aluminium cations on electrocarboxylation processes in undivided cells with Al sacrificial anodes

Isse

Scialdone

Galia

et al. 2005

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Proton and aluminum-27 nuclear magnetic resonance studies of aluminum(III) perchlorate in N,N-dimethylformamide

Cited by 64 publications

References 1 publication

Aluminum complexes in solution as studied by aluminum-27. Nuclear magnetic resonance

Aluminum complexes in solution as studied by aluminum-27. Nuclear magnetic resonance

Intercalation of large cluster cations in TaS2

The influence of aluminium cations on electrocarboxylation processes in undivided cells with Al sacrificial anodes

Contact Info

Product

Resources

About