Abstract
AbstractThe 29Si spin–lattice relaxation times, T1(29Si), of the various silicate anions present in high‐purity alkaline silicate solutions are reported. Regular silicate cages display the longest T1(29Si) values and, in the case of the cubic octameric cage, an unexpectedly large nuclear Overhauser enhancement, indicating that, unlike the smaller silicate oligomers, the cubic octamer relaxes primarily via the (29Si, 1H) dipole‐dipole interaction. This phenomenon provides, inter alia, a simple diagnostic test for such cages.
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