In the title compound, [Mn(2)O(C(18)H(18)ClN(4))(2)](PF(6))(2), the Mn atom is chelated by a tetra-dentate ligand via four N atoms, and further bonded to one chloride ion and one bridging oxide, to give a centrosymmetric cation and distorted octa-hedral coordination geometry.

The complete mol-ecule of the title compound, C(4)H(3)ClN(3), is generated by crystallographic mirror symmetry, with the Cl atom, one N atom and two C atoms lying on the reflecting plane. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into chains propagating in [100].

The title compound, C(12)H(15)ClN(2)O, is a piperazine derivative with the potential for use as a starting material for pharmaceutial and agrochemical applications. The structure is stabilized by C-H⋯O hydrogen bonds, C-H⋯π inter-actions and π-π stacking inter-actions [centroid-centroid distance = is 4.760 (2) Å].

In the title compound, C(12)H(9)ClN(2)O(2)·H(2)O, the dihedral angle between the aromatic rings is 13.9 (2)° and an intra-molecular N-H⋯O hydrogen bond occurs. In the crystal structure, the components are linked by N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds.

The title compound, C(17)H(17)ClN(2)O(3), has a trans conformation about the C=N double bond and an intra-molecular O-H⋯N occurs. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds.

In the title compound, C(8)H(7)ClN(4)S(2), the thia-zole ring is essentially planar [r.m.s. deviation = 0.0011 (2) Å] and conformation of the thia-zolidine ring is twisted on the C-C bond. The C=N bond has a Z configuration.

In the title compound, C(13)H(17)ClN(2)O, the piperidine ring adopts a chair conformation and the N atom in that ring is close to pyramidal (bond angle sum = 357.5°). In the crystal, mol-ecules are linked into C(4) chains propagating in [010] by N-H⋯O hydrogen bonds.

The mol-ecular skeleton of the title mol-ecule, C(9)H(11)ClN(4)O, is essentially planar, the dihedral angle between the ring and the and N/N/C plane being 6.7 (3)°. In the crystal, inter-molecular N-H⋯O and N-H⋯N hydrogen bonds link the mol-ecules into ribbons propagated along [010].