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In the title salt, C15H17N2+·ClO4−, the isoindoline N atom is protonated and an intramolecular N—H...N hydrogen bond occurs. In the crystal, N—H...O and numerous weak C—H...O interactions occur between the cation and anion. The O atoms of the perchlorate anion are disordered over four sets of sites with occupancies of 0.438 (4), 0.270 (9), 0.155 (8) and 0.138 (5).

The crystal structure of the title compound, [Ni(2)(C(27)H(24)Br(3)N(4)O(3))(CH(3)CO(2))(CH(3)OH)(H(2)O)]·2CH(3)OH·H(2)O contains [L(OAc){(CH(3)OH)Ni}{(H(2)O)Ni}] mol-ecules {H(3)L = 2-(5-bromo-2-hy-droxy-phen-yl)-1,3-bis-[4-(5-bromo-2-hy-droxy-phen-yl)-3-aza-but-3-en-yl]-1,3-imidazolidine} with additional water and two methanol solvent mol-ecules. In this instance, one of the two Ni atoms is coordinated to a water and the other to a methanol mol-ecule. The Ni-O and Ni-N distances, as well as the angles about the metal atoms, show quite regular octa-hedra around the central ions. The Ni-O(phenol)-Ni and Ni-O(acetate)-Ni angles are not similar [95.26 (13) and 97.34 (13)°, respectively], indicating that this subtle solvate exchange induces significant differences in the conformation adopted. The coordinated methanol ligand is involved in an intra-molecular hydrogen bond to the uncoordinated O atom of the bridging acetate ligand, while the coordinated water mol-ecule forms a hydrogen bond with the one of the methanol solvent mol-ecules. The water solvent mol-ecule forms strong hydrogen bonds to both phenolate O atoms. The remaining methanol solvent mol-ecule also forms a hydrogen bond with this solvent water mol-ecule.

The centrosymmetric binuclear complex, [Cu(2)(C(13)H(13)N(2)O)(2)(NCS)(2)], formed via phenolate oxygen bridges, involves the Cu(II) atoms in a distorted square-pyramidal coordination [τ = 0.197 (1)]. A Cu⋯Cu separation of 3.2281 (3) Å is observed. The in-plane Cu-O(phenolate) distance [1.9342 (8) Å] is shorter than the axial distance [2.252 (8) Å]. The Cu-N(amine) and Cu-N(py) distances are similar [2.0095 (10) and 2.0192 (10) Å, respectively]. The Cu-N(thio-cyanate) distance [1.9678 (11) Å] is in the range found for Cu-N distances in previously determined structures containing coordinated thio-cyanate anions. There is an inter-molecular hydrogen bond between the amine H atom and the S atom of a coordinated thio-cyanate anion.

In the crystal of the dinuclear title compound, [Cu(2)(C(13)H(13)N(2)O)(2)(ClO(4))(2)]·2CH(3)CN, the two bridging perchlorate ions chelate to the two Cu(II) atoms in a μ-O:O' fashion on opposite sides of the equatorial plane. The Cu(II) ions display a distorted octa-hedral coordination geometry (in the usual 4 + 2 Jahn-Teller arrangement), each being coordinated by two O atoms from the two perchlorate ligands, and two N and O atoms from the reduced Schiff base ligand. The asymmetric unit contains two acetonitrile solvent mol-ecules. In the crystal structure, in addition to N-H⋯O hydrogen bonds, there are weak C-H⋯O inter-actions between the perchlorate O atoms and the reduced Schiff base ligand. C-H⋯N inter-actions are also present.

In the title compound, [Cu(ClO(4))(2)(C(12)H(13)N(3))(C(2)H(3)N)], the Cu(II) atom is six-coordinate in a Jahn-Teller distorted octahedral geometry, with coordination by the tridentate chelating ligand, an acetonitrile mol-ecule, and two axial perchlorate anions. The tridentate ligand bis-(2-pyridylmeth-yl)amine chelates meridionally and equatorially while an acetonitrile mol-ecule is coordinated at the fourth equatorial site. The two perchlorate anions are disordered with site occupancy factors of 0.72/0.28. The amine H is involved in intra-molecular hydrogen bonding to the perchlorate O atoms and there are extensive but weak inter-molecular C-H⋯O inter-actions.

In the title compound, C24H32N42+·2ClO4−, the two N atoms of the amine are protonated. The H atoms of the protonated amine form hydrogen bonds with the pyridyl N atoms (intramolecular) and O atoms of adjacent perchlorate anions. In addition, there are weak C—H⋯O inter­actions which link the formula units into chains along [101]. Each perchlorate anion is disordered over three conformations, with occupancy factors of 0.482 (2), 0.331 (2) and 0.187 (4), and 0.532 (8), 0.324 (4) and 0.133 (7).