Table 2.
Observed frequency position of the antisymmetric νas(COO−) and symmetric νs(COO−) stretches for different coordination modes in carboxylates and acetates in the presence of DDA in the neat phases
| Species | νas(COO−), cm−1 | νs(COO−), cm−1 | Δν(=νas-νs), cm−1 | Coordination mode |
|---|---|---|---|---|
| AcAc | 1755/1728/1698 (monomer/dimer) | 1296 | 459/432/402 | |
| LAc | 1696 (dimer) | 1299 | 397 | |
| [AcAc-DDA] | 1515 | 1405 | 110 | Bridging bidentate |
| [AcAc-2DDA] | 1515 | 1405 | 110 | Bridging bidentate |
| [LAc-DDA] | 1511 | 1405 | 106 | Bridging bidentate |
| [LAc-2DDA] | 1510 | 1407 | 103 | Bridging bidentate |
| NaOAc (H2O)a | 1561 | 1413 | 148 | Ionic (chelating) |
| NaL (H2O) | 1557 | 1422 | 135 | Ionic (chelating) |
| AgOAc | 1516 | 1415 | 101 | Bridging bidentate (dimer) |
| AgL | 1518 | 1415 | 103 | Bridging bidentate (dimer) |
| [AgOAc-2DDA] | 1549 | 1392 | 157 | Chelating (ionic) |
| [AgL-2DDA] | 1551 | 1392 | 159 | Chelating (ionic) |
| Ag NPsb | 1528 | 1399 | 129 | Chelating |
a(Nara et al. 1996)
bAg NPs synthesized from [AgL-2DDA] complex as described in Experimental