Table 1.
Radius of anion and pKa value of its conjugated acid
| Anion (A) | Calculated radius a (Å) | Hydrated radius b (Å) | pKa of conjugated HA | photoluminescence intensity at peak (a.u.) |
|---|---|---|---|---|
| CN− | 1.91 | 3 | 9.21 | 119.40 |
| N3− | 1.95 | – | 4.7 | 93.65 |
| AcO− | 1.62 | 4–4.5 | 4.76 | 86.40 |
| F− | 1.19 | 3.5 | 3.2 | 81.25 |
| Cl− | 1.67 | 3 | −7 | 67.50 |
| Br− | 1.82 | 3 | −9 | 54.33 |
| I− | 2.06 | 3 | −11 | 61.13 |
a (1) Jenkins, H.D.B.; Thakur, K.P.J. Chem. Educ.,1979, 56 (9), 576–577. (2) Website: http://www.wiredchemist.com/chemistry/data/thermochemical-radii-anions. b Kiclland, J. J. Am. Chem. Soc.1937, 59(9), 1675–1678.