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In the title complex, [Cd(C9H7NO3)(C10H8N2)2]ClO4·2H2O, the CdII atom is six-coordinated by two O atoms from the hippurate ligand and four N atoms from two 2,2-bipyridine ligands in a distorted octa­hedral geometry. The mol­ecules are linked by O—H⋯O hydrogen bonds, generating edge-shared centrosymmetric R54(15) rings along the [010] direction. Inter­molecular C—H⋯O and N—H⋯O hydrogen-bonding inter­actions stabilize the crystal packing.

In the cation of the title compound, [Mn(C9H7NO3)(C12H10N2)2(H2O)]ClO4·3H2O, the MnII atom is coordinated by two O atoms, one from a hippurate ligand and the other from a coordinated water mol­ecule, and four N atoms from two 1,10-phenanthroline ligands. In the crystal structure, the cations and water mol­ecules are linked by intra- and inter­molecular hydrogen bonds, forming R64(12) rings; these rings are further connected by inter­molecular hydrogen bonds and C—H⋯π inter­actions into a three-dimensional supra­molecular framework.

In the title complex, [Cu(C9H7NO3)(C12H10N2)2]ClO4·2H2O, the Cu atom exhibits a significantly distorted octa­hedral geometry as a result of the Jahn–Teller effect and the chelating influence of the ligands. In the crystal structure, the mol­ecules are linked by hydrogen bonds into one-dimensional double chains, which are further linked into two-dimensional layers by π–π stacking inter­actions between neighbouring aromatic ligands.

In the title complex, the zinc(II) ion is four coordinated in a distorted tetrahedron geometry. The neighboring molecules are connected by the hydrogen bonds to form an infinite three-dimensional system. Moreover, there are π-π interactions between adjacent molecule planes, pyridyl and phenyl rings of the complex, which are arranged in a face-to-face fashion. The ligand and the complex could emit blue light with an emission maximum at λ=480 nm in solid state.

In the title compound, [Co(C(9)H(8)NO(3))(C(12)H(8)N(2))(2)(H(2)O)]NO(3)·H(2)O, the Co(II) atom is six-coordinated by a carboxylate O atom of the hippurate (Hc) anion, a water O atom and four N atoms from two 1,10-phenanthroline ligands in a distorted octa-hedral geometry. The uncoordinated O atom of the hippuric acid anion is involved in an intra-molecular hydrogen bond to the coordinated water mol-ecule. The crystal packing is stabilized by inter-molecular O-H⋯O hydrogen bonds involving the Hc anions, the coordinated water mol-ecule, the nitrate anion and the uncoordinated water mol-ecule.

In the title compound, [Co(C(7)H(5)O(2))(2)(C(5)H(6)N(2))(2)], the Co(II) atom is hexa-coordinated by four O atoms from two benzoate anions, and two N atoms from two 2-amino-pyridine mol-ecules, resulting in a distorted octa-hedral geometry. Both benzoate anions act as bidentate ligands and both 2-amino-pyridine mol-ecules are coordinated to the metal through their pyridyl N atoms. The crystal packing is stabilized by inter-molecular N-H⋯O hydrogen bonds, C-H⋯π, and π-π stacking inter-actions involving benzoate anions and 2-amino-pyridine mol-ecules.

In the title compound, [Co(C7H5O2)2(C5H6N2)2], the CoII atom is hexa­coordinated by four O atoms from two benzoate anions, and two N atoms from two 2-amino­pyridine mol­ecules, resulting in a distorted octa­hedral geometry. Both benzoate anions act as bidentate ligands and both 2-amino­pyridine mol­ecules are coordinated to the metal through their pyridyl N atoms. The crystal packing is stabilized by inter­molecular N—H⋯O hydrogen bonds, C—H⋯π, and π–π stacking inter­actions involving benzoate anions and 2-amino­pyridine mol­ecules.

In the title compound, [Cd(C7H5O2)2(C5H6N2)2], the CdII atom is hexa­coordinated by four O atoms from two crystallographically independent benzoate anions, and two pyridine N atoms from two crystallographically independent 2-amino­pyridine mol­ecules in a distorted octa­hedral geometry. In the crystal structure, the metal complexes are connected by N—H⋯O hydrogen bonding between the carboxylate O atoms of the benzoate anions and the amino H atoms of the 2-amino­pyridine ligands. The benzoate and the amino­pyridine rings are stacked in the direction of the crystallographic a axis, indicating π–π stacking inter­actions are present [centroid-centroid distance = 3.6790 (15) A].

The title complex, [MnCl2(C21H19N3)]·0.5CH2Cl2 or [MnCl2(Plep)]·0.5CH2Cl2 {Plep is 2,6-bis­[1-(phenyl­imino)eth­yl]pyridine, derived from the condensation of 2,6-diacetyl­pyridine and aniline in methanol} is composed of two crystallographically independent [MnCl2(Plep)] neutral units and a CH2Cl2 solvent mol­ecule. Both complex mol­ecules have similar geometries in which the MnII atom is coordinated by the N atoms of pyridine and the two imine groups of a neutral Schiff base, and by two chloride anions in a distorted trigonal–bipyramidal geometry. The structure of each [MnCl2(Plep)] unit exhibits a pseudo-mirror plane through the metal atom, two chloride anions and the pyridine ring. The crystal packing is stabilized by inter­molecular C—H⋯Cl and C—H⋯π and inter­actions.

The Zn atom of the title complex, [Zn(NCS)2(C7H8N4O)2(H2O)2] or [Zn(SCN)2(H-Pysc)2(H2O)2] [H-Pysc = N-aminocarbonyl-N′-(3-pyridylmethylene)hydrazine], derived from the condensation of pyridine-3-carbaldehyde and semicarbazone, is located at a crystallographic centre of inversion and is octahedrally coordinated by two thiocyanate anions, two aqua molecules and two molecules of the neutral Schiff base ligand H-Pysc. The Schiff base molecules act as monodentate ligands coordinating the metal through the pyridyl N atom, whereas the amide O and imine N atoms remain uncoordinated. The crystal packing is stabilized by intermolecular hydrogen bonds involving H-Pysc ligands, thiocyanate anions and water molecules.

The Cd atom in the title complex, [Cd(C2H3O2)(NCS)(C7H8N4O)(H2O)]·H2O, is coordinated by one neutral Schiff base ligand, one acetate anion, one thio­cyanate anion and one water mol­ecule, forming a distorted penta­gonal–bipyramidal geometry. The thio­cyanate S atom and the coordinated water ligand occupy the apical positions of the coordination polyhedron. The acetate acts as a bidentate ligand through the carboxylate O atoms. The Schiff base, derived from the condensation of pyridine-2-carbaldehyde and semicarbazone, acts as a tridentate ligand, coordinating the metal through the amide, imine and pyridyl N atoms in a meridional fashion. The crystal packing is stabilized by π–π stacking inter­actions between the neighboring pyridine rings and hydrogen bonds involving the Schiff base, thio­cyanate, water mol­ecules and uncoordinated solvent water mol­ecules.

In the title complex, [CoCl2(C13H11N3O2)2(H2O)2]·2H2O, each CoII atom occupies an inversion center and is coordinated by two water mol­ecules, two Cl− anions and two N-benzoyl-N′-(isonicotino­yl)hydrazine ligands in a distorted octa­hedral geometry. The asymmetric unit contains two half-complexes. The three-dimensional supra­molecular architecture is stabilized by inter­molecular hydrogen bonding.

In the title complex, [Mn(SCN)2(H-Pysc)2(H2O)2] {H-Pysc = 3-[2-(amino­carbon­yl)hydrazonometh­yl]pyridine, C7H8N4O}, MnII, located at an inversion centre, is coordinated by two thio­cyanate anions, two water mol­ecules and two mol­ecules of the neutral Schiff base ligand H-Pysc, forming an octa­hedral configuration. The Schiff base acts as a monodentate ligand, coordinating to the metal through the pyridyl N atom, whereas the amide O and imine N atoms remain uncoordinated. The complex mol­ecules are held together by inter­molecular hydrogen bonds into a three-dimensional supra­molecular network.