Research Article
Crystal Structure of Apraclonidine Hydrochloride
Table 2
Geometrical parameters.
| (a) Selected bond lengths (Å), bond angles (°) and torsion angles (°) |
| | Cl1–C2 | 1.730(1) | | N1–C1 | 1.420(2) | | N2–C4 | 1.355(2) | | N3–C8 | 1.448(2) | | N4–C9 | 1.463(2) | | Cl2–C6 | 1.741(1) | | N1–C7 | 1.329(2) | | N3–C7 | 1.325(2) | | N4–C7 | 1.320(2) |
| | Cl1–C2–C1 | 118.43(9) | | Cl2–C6–C1 | 118.76(9) | | N1–C1–C2 | 121.4(1) | | N1–C1–C6 | 122.0(1) | | N1–C7–N3 | 122.8(1) | | N2–C4–C5 | 120.1(1) | | C7–N3–C8 | 111.5(1) | | C7–N4–C9 | 111.0(1) | | Cl1–C2–C3 | 119.09(10) | | Cl2–C6–C5 | 118.08(8) | | C1–N1–C7 | 122.8(1) | | N1–C7–N4 | 125.6(1) | | N2–C4–C3 | 121.6(1) | | N3–C7–N4 | 111.6(1) | | N3–C8–C9 | 103.0(1) | | N4–C9–C8 | 102.9(1) |
| | C7–N1–C1–C2 | −86.6(1) | | C1–N1–C7–N3 | 168.2(1) | | C8–N3–C7–N1 | 177.1(1) | | N1–C1–C2–Cl1 | 2.1(2) | | C7–N1–C1–C6 | 96.2(1) | | C1–N1–C7–N4 | −12.2(2) | | C9–N4–C7–N1 | −177.9(1) | | N1–C1–C6–Cl2 | −4.9(2) |
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| (b) Possible hydrogen bonds |
| | Donor | H | Acceptor | D⋯A (Å) | D–H (Å) | H⋯A (Å) | D–H⋯A (°) |
| | N1 | H5 | Cl3[I] | 3.226(1) | 0.90 | 2.38 | 157 | | N2 | H2 | Cl3[II] | 3.418(1) | 0.80 | 2.65 | 162 | | N2 | H3 | Cl3[III] | 3.400(2) | 0.94 | 2.52 | 156 | | N3 | H7 | Cl3[I] | 3.338(1) | 0.79 | 2.67 | 144 | | N4 | H6 | Cl3 | 3.213(1) | 0.83 | 2.42 | 163 |
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Symmetry operators:
[I] , , .
[II] , , .
[III] , , .
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