Table 1.
Hyperfine couplings and g-values for T(5OH)• and T(6OH)•.a
| Compound (3 mg/ml) | Hyperfine coupling constants (G) |
g-value | ||
|---|---|---|---|---|
| T(5OH)• | T(6OH)• | |||
|
| ||||
| αH(C6) | Me(3βH) | lpH(C6)/%b | ||
| dThd, L-dThd, α-dThd, [5',5"-D,D]-dThd | ca. 20 (1αH) | 2.0023 | ||
|
| ||||
| 21 | 9 (70%) | 2.0035 | ||
|
| ||||
| 21 | 39 (30%) | 2.0035 | ||
| N3-Me-dThd | ca. 20 (1αH) | 2.0023 | ||
|
|
||||
| 19c | 41c |
2.0035 | ||
| 19d | 33d | |||
| 5'-TMPe, [5',5"-D,D]-5'-TMP | ca. 20 (1αH) | 2.0023 | ||
|
|
||||
| 21 | 9 (80%) | 2.0035 | ||
|
|
||||
| 21 | 45 (20%) | 2.0035 | ||
| 3',5'-cTMP, T-3',5'-BP, 2',3'-dd-5'-TTP | ca. 20 (1αH) | 2.0023 | ||
|
|
||||
| 21 | 9 | 2.0035 | ||
a
For T(5OH)• on annealing (155–160K) recorded at 77 K and for T(6OH)• on annealing (175–180 K) recorded at 77 K; both at pH (ca. 12), and concentration (2.5 to 3 mg/ml) unless otherwise stated.
b
The experimentally determined percentage composition of C6-H equatorial and axial conformers of T(6OH)• are in parenthesis.
c
On annealing at 175 K recorded at 77 K (see supporting information Figure S20).
d
On annealing at 180 K recorded at 77 K (see Figure 4).
e
The C6-H β-proton hyperfine couplings are found to be concentration dependent (see Figure 8).