Table 4. Steady-State and Time-Resolved Fluorescence Anisotropy in Aqueous Suspension Compared with Fluid and Glassy 2-MeTHF Solutions.
| cmpd | ra (ν̃em /103 cm–1) | r0b (ν̃em /103 cm–1) | θc (ns) |
|---|---|---|---|
| 1 (neat) | 0.08 (24.2) | – | – |
| 1 (2-MeTHF, RT)d | 0.12 (26.9) | 0.34 (25.3) | 0.64 |
| 2%1@TPP | 0.26 (26.6) | 0.40 (26.6) | ∞ |
| 0.02%1@TPP | 0.25 (26.6) | 0.30 (26.7) | ∞ |
| 1 (2-MeTHF, 77 K)e | 0.34 (25.6) | 0.34 (26.9) | ∞ |
| 2 (neat) | 0.13 (24.0) | – | – |
| 2 (2-MeTHF, RT)d | 0.13 (25.5) | 0.36 (25.4) | 0.46 |
| 2%2@TPP | 0.27 (26.1) | 0.30 (26.1) | ∞ |
| 0.02%2@TPP | 0.27 (26.1) | 0.23e (26.1) | ∞ |
| 2 (2-MeTHF, 77 K)e | 0.34 (25.4) | 0.34 (26.8) | ∞ |
| 3 (neat) | 0.10 (23.5) | – | – |
| 3 (2-MeTHF, RT)d | 0.15 (25.2) | 0.34 (25.3) | 0.69 |
| 2%3@TPP | 0.31 (26.0) | 0.30 (25.9) | ∞ |
| 0.02%3@TPP | 0.25f (26.0) | 0.40 (26.0) | ∞ |
| 3 (2-MeTHF, 77 K)e | 0.34 (25.0) | 0.39 (26.3) | ∞ |
| 4 (neat) | 0.21(24.0) | – | – |
| 4 (2-MeTHF, RT)d | 0.08 (26.6) | 0.34 (26.6) | 0.29 |
| 2%4@TPP | 0.29 (25.8) | 0.26 (26.1) | ∞ |
| 0.02%4@TPP | 0.27 (25.8) | 0.30 (26.1) | ∞ |
| 4 (2-MeTHF, 77 K)e | 0.32 (30.7) | 0.38 (30.7) | ∞ |
| 5 (2-MeTHF, RT)d | 0.02 (27.0) | 0.34 (27.2) | 0.15 |
| 5 (2-MeTHF, 77 K)e | 0.39 (27.5) | 0.37 (27.6) | ∞ |
a
Steady-state anisotropy r at ν̃em with an estimated error of ±0.02.
b
Time-resolved anisotropy at ν̃em extrapolated to t = 0. Estimated error is ±0.05
c
Rotational correlation time θ, with an estimated error of ±50 ps.
d
Fluid.
e
Glassy.
f
The estimated error is ±0.1.