Abstract
Selective and nonselective inversion NMR experiments were carried out to investigate the dynamics of Si exchange between silicate anions in alkaline silicate solutions. Rate coefficients for the Si exchange between monomer and dimer anions and between monomer, dimer, and cyclic trimer anions were determined as functions of alkali-metal cation size. The largest rate coefficient for Si exchange between monomer and dimer anions occurs for K+, whereas the largest rate coefficient for Si exchange between monomer, dimer, and cyclic trimer anions occurs for Na+. Cation size is also found to influence spin-lattice (T1) and spin-spin relaxation (T2) times.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1737-1741 |
| Number of pages | 5 |
| Journal | Journal of physical chemistry |
| Volume | 93 |
| Issue number | 5 |
| DOIs | |
| State | Published - 1989 |