Table 2. Hydrogen-Bonding Parameters for Peptides 1–3.
| D–H···A | D···H(Å) | H···A (Å) | D···A (Å) | D–H···A (deg) | |
|---|---|---|---|---|---|
| 1 | N2–H2···N1 | 0.8600 | 2.5100 | 2.895(5) | 108.00 |
| N3–H3···N2 | 0.8600 | 2.4500 | 2.761(5) | 102.00 | |
| N1–H1···O1 | 0.8600 | 2.2200 | 2.918(5) | 139.00a | |
| 2 | N6–H6···N7 | 0.8600 | 2.5600 | 2.919(4) | 106.00 |
| N8–H8···N6 | 0.8600 | 2.3800 | 2.718(4) | 104.00 | |
| O4–H4···O2 | 0.8200 | 1.9000 | 2.715(4) | 176.00b | |
| 3 | N6–H6···O2 | 0.8600 | 2.1600 | 2.969(7) | 156.00 |
| N6–H6···N5 | 0.8600 | 2.5300 | 2.833(8) | 101.00 | |
| N5–H5···O1 | 0.8600 | 1.9800 | 2.823(6) | 164.00 | |
| N3–H3···N2 | 0.8600 | 2.5500 | 2.840(8) | 101.00 | |
| N1–H1···O1 | 0.8600 | 2.0900 | 2.706(7) | 128.00 | |
| N4–H4···O5 | 0.8600 | 2.0800 | 2.724(8) | 131.00 | |
| N2–H2···O5 | 0.8600 | 2.0800 | 2.922(6) | 165.00c | |
| N3–H3···O6 | 0.8600 | 2.0800 | 2.897(6) | 158.00c |
Symmetry equivalent: a = 1 + x, y, z; b = x, y, 1 + z; c = x, −1 + y, z.