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(27Al) Aluminum NMR

Use our NMR service that provides 27Ala NMR and many other NMR techniques.

27Aluminum (27Al)is a high sensitivity nucleus that yields broad lines over a wide chemical shift range. 27Al is a spin 5/2 nucleus and is therefore quadrupolar. As a result, the signal width increases with asymmetry of the environment with somewhat broad lines in symmetrical environments (fig. 1) but very broad lines in asymmetric ones. The main use of aluminum NMR is to detect the presence of aluminum and measure its relaxation rate in order to detect binding. There is always a broad signal arising from the probe in the 27Al spectrum. There is little information available about aluminum chemical shifts (fig. 2).

Fig. 1. Chemical shift ranges for 27Al NMR

Chemical shifts of aluminum

Fig. 2. 27Al-NMR spectrum of AlCl3 in D2O

Aluminum spectrum

Properties of 27Al

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PropertyValue
Spin5/2
Natural abundance100%
Chemical shift range400 ppm, from -200 to 200
Frequency ratio (Ξ)26.056859%
Reference compound1.1 m Al(NO3)3 in D2O
Linewidth of reference11 Hz
T1 of reference0.03 s
Receptivity rel. to 1H at natural abundance0.207
Receptivity rel. to 1H when enriched0.207
Receptivity rel. to 13C at natural abundance1220
Receptivity rel. to 13C when enriched1220
Linewidth parameter69 fm4

Safety note

Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, aluminum salts may be toxic in large doses.