In the title hydrate, C(17)H(14)ClN(3)O·H(2)O, the dihedral angle between the quinoline fused-ring system and the benzene ring is 13.4 (2)° and the conformation about the C=N bond is E. In the crystal, N(h)-H⋯O(w) and O(w)-H⋯N(q) (h = hydro-zone, w = water and q = quinoline) hydrogen bonds generate a two-dimenstional network in the ac plane. A weak C-H⋯O inter-action helps to consolidate the pa...

In the title compound, C(18)H(13)Cl(2)NO(2), the quinoline ring system is almost planar (r.m.s. deviation 0.009 Å), and the phenyl and carboxyl-ate planes are twisted away from it by 59.2 (1) and 65.9 (2)°, respectively.

In the title compound, C(18)H(14)ClNO(2), the quinoline ring system is planar (r.m.s. deviation = 0.032 Å) and the phenyl ring is twisted away from it by 57.5 (1)°. The crystal structure is stabilized by weak C-H⋯π inter-actions.

A 500-mg dose of the quinoline ciprofloxacin was administered orally to each of six healthy male volunteers, after which the concentrations of this agent in serum and blister fluid were measured. Absorption appeared to be rapid, with a mean peak level of 2.4 micrograms/ml attained 1.25 h after administration. The serum elimination half-life was 3.9 h. The agent penetrated blister fluid well, th...

In the title compound, C(19)H(16)ClNO(2), the quinoline ring system is planar (r.m.s. deviation = 0.008 Å). The phenyl group and the -CO(2) fragment of the ester unit form dihedral angles of 60.0 (1) and 60.5 (1)°, respectively, with the quinoline ring system.

In the title compound, C(16)H(13)NO(2), the quinoline system is approximately planar with a maximum deviation from the least-squares plane of 0.059 (1) Å for the N atom. The phenyl ring is rotated by 62.16 (4)° with respect to the plane of the quinoline system. In the crystal, O-H⋯O hydrogen bonds link mol-ecules into infinite chains running along the b-axis direction.

In the title compound, C(17)H(15)NO(2), the dihedral angle between the quinoline and benzene ring systems is 62.17 (1)°. In the crystal, zigzag chains propagating in c are linked by C-H⋯O hydrogen bonds, and weak C-H⋯π inter-actions link the chains.

In the title compound C(17)H(15)ClN(2), the dihedral angle between the quinoline ring system and the phenyl ring is 50.18 (6)°. In the crystal, mol-ecules are linked into chains running along the c axis by N-H⋯N hydrogen bonds.

The title compound, C(10)H(10)NO(2) (+)·Cl(-), contains a quinoline ring system which is essentially planar, with the largest deviation from the mean plane being 0.017 (1) Å. In the crystal, the ion pairs and their inversion-symmetry-related partners are linked by N-H⋯Cl and O-H⋯Cl hydrogen bonds to form tetramers which are further connected through O-H⋯O hydrogen bonds, building infinite one-d...

In the title compound, C(18)H(14)BrN(3)O(2)·H(2)O, the dihedral angle between the mean planes of the benzene ring and the quinoline ring system is 34.2 (3)°. In the crystal, the constituents are linked into chains by O-H⋯O, N-H⋯O and O-H⋯N hydrogen bonds.