Table 1. Comparison of selected geometrical parameters (Å, °) of compounds (I)–(V).
The dihedral angle is that between the aromatic rings. The equivalent bond lengths and torsion angles are given for (IIB).
| Bond length | (I) | (II) Molecule A | (II) Molecule B | (III) | (IV) | (V) |
|---|---|---|---|---|---|---|
| C1—S1 | 1.763 (2) | 1.754 (2) | 1.760 (2) | 1.752 (4) | 1.751 (5) | 1.761 (2) |
| S1—N1 | 1.631 (2) | 1.645 (2) | 1.641 (2) | 1.644 (4) | 1.645 (4) | 1.625 (2) |
| N1—N2 | 1.388 (2) | 1.397 (3) | 1.390 (2) | 1.394 (5) | 1.407 (5) | 1.393 (2) |
| N2—C7 | 1.269 (3) | 1.269 (3) | 1.269 (3) | 1.258 (5) | 1.272 (5) | 1.273 (3) |
| C7—C8 | 1.463 (3) | 1.465 (3) | 1.462 (3) | 1.473 (6) | 1.461 (6) | 1.458 (3) |
| Torsion angle | ||||||
| C1—S1—N1—N2 | −62.4 (2) | −46.8 (2) | 56.8 (2) | −66.0 (3) | −66.0 (3) | −58.4 (2) |
| S1—N1—N2—C7 | 158.9 (2) | 171.4 (2) | −165.3 (2) | 166.5 (3) | 165.4 (3) | 157.9 (2) |
| N1—N2—C7—C8 | 175.0 (2) | −175.9 (2) | 178.2 (2) | 177.8 (4) | 175.8 (4) | 175.8 (2) |
| Dihedral angle | 81.0 (1) | 75.9 (1) | 73.4 (1) | 78.4 (2) | 74.8 (2) | 76.9 (1) |