Four new mixed-ligand Ni(II) complexes (1-4) containing imidazole (im) or benzimidazole (bz) and tridentate Schiff bases derived from 2,4-dihydroxybenzaldehyde (24D) and 4-methyl-3thiosemicarbazide (MT24D) or 4-phenyl-3-thiosemicarbazide (PT24D) were synthesised and characterised using elemental and spectral analysis including FTIR, UV-Vis, 1 H NMR, 13 C{ 1 H} NMR and mass spectrometry for Schiff bases, while the complexes were additionally analysed

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In the organic mol­ecule of the title hydrate, C11H15N3OS·H2O, {systematic name: 3-ethyl-1-{(E)-[1-(2-hy­droxy­phen­yl)ethyl­idene]amino}­thio­urea monohydrate}, a dihedral angle of 5.39 (2)° is formed between the hy­droxy­benzene ring and the non-H atoms comprising the side chain (r.m.s. deviation = 0.0625 Å), with the major deviation from planarity noted for the terminal ethyl group [the C—N—C—C torsion angle = −172.17 (13)°]. The N—H H atoms are syn and an intra­molecular hy­droxy–imine O—H⋯N hydrogen bond is noted. In the crystal, the N-bonded H atoms form hydrogen bonds to symmetry-related water mol­ecules, and the latter form donor inter­actions with the hy­droxy O atom and with a hy­droxy­benzene ring, forming a O—H⋯π inter­action. The hydrogen bonding leads to supra­molecular tubes aligned along the b axis. The tubes are connected into layers via C—H⋯O inter­actions, and these stack along the c axis with no directional inter­actions between them.