Dichloridobis(2-{1-[2-(1H-indol-3-yl)ethyl-iminio]eth-yl}phenolate-κO)zinc(II)-2-{1-[2-(1H-indol-3-yl)ethyl-iminio]eth-yl}phenolate (1/2)

3-{[(E)-(2-Hydroxynaphthalen-1-yl)methylidene]amino}pyridinium per-chlorate

In the title Schiff base salt, C₁₆H₁₃N₂O⁺·ClO₄⁻, the pyridine ring and the naphthalene ring system are approximately co-planar [making a dihedral angle of 6.05 (12)°] and an intra­molecular O—H⋯N hydrogen bond occurs between the hydroxyl and imino groups. In the crystal, the cations and anions are linked by N—H⋯O and weak C—H⋯O hydrogen bonds, forming the supra­molecular layers parallel to (100). The crystal studied was an inversion twin refined with minor component = 0.43 (13).

A triclinic polymorph of dichlorido(2-{[2-(isopropylammonio)ethyl]iminomethyl-κN}-5-methoxyphenolato-κO1)zinc

The title compound, [ZnCl₂(C₁₃H₂₀N₂O₂)], was first reported in the monoclinic space group P2₁/n [Han et al. (2010 ▶). Acta Cryst. E66, m469]. This investigation reveals a triclinic polymorph in the space group P-1 with an asymmetric unit that contains two independent mol­ecules of the mononuclear zinc(II) complex. In each mol­ecule, the Zn^II atoms are coordinated in a bidentate fashion by the phenolate O and imine N atoms of the Schiff base ligand. Two Cl⁻ anions complete the tetra­hedral coordination in each case. The most obvious difference between the two forms is that the Zn—L (L = O, N, Cl) bond lengths in both unique mol­ecules are longer than those found in the monoclinic polymorph, or indeed in other similar complexes. In the crystal, mol­ecules are linked through N—H⋯O and N—H⋯Cl hydrogen bonds, forming chains along the b axis.

(Acetato-κO)(2-bromo-6-{[3-(dimethyl-aza-nium-yl)propyl-imino-κN]meth-yl}phenolato-κO)(thio-cyanato-κN)zinc

In the title compound, [Zn(CH₃COO)(NCS)(C₁₂H₁₇BrN₂O)], the Zn^II atom is four-coordinated in a distorted tetra­hedral geometry, binding to a phenolate O and an imine N atom of the Schiff base ligand, the O atom of an acetate ligand and one thio­cyanate N atom. In the crystal, mol­ecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers.

Zwitterionic (E)-1-[(4-nitro-phen-yl)iminio-meth-yl]naphthalen-2-olate

The title compound, C(17)H(12)N(2)O(3), was synthesized by the reaction of 2-hy-droxy-1-naphthaldehyde with 4-nitro-benzenamine. These condense to form the Schiff base, which crystallizes in the zwitterionic form. In the structure, the keto-amino tautomer has a fairly short intra-molecular N-H⋯O hydrogen bond between the 2-naphthalenone and amino groups, with electron delocalization. The mol-ecule is essentially planar, with a dihedral angle of 1.96 (3)° between the ring systems. In the crystal, the mol-ecules are linked via inter-molecular C-H⋯O hydrogen bonds, forming a layer parallel to (101).

(4-Chloro-2-{[(pyridin-2-ylmeth-yl)imino]-meth-yl}phenolato)iodido(methanol)zinc(II)

The title Schiff base zinc(II) complex, [Zn(C(13)H(10)ClN(2)O)I(CH(3)OH)], was synthesized by the reaction of 5-chloro-salicyl-aldehyde, 2-amino-methyl-pyridine and zinc iodide in methanol. The Zn(II) atom is five-coordinated by one phenolate O atom, one imine and one pyridine N atom of the Schiff base ligand, one methanol O atom and one I atom, forming a distorted square-pyramidal geometry, with the I atom at the apical site. The dihedral angle between the benzene and pyridine rings is 22.9 (2)°. In the crystal, centrosymmetrically related mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming dimers.

N′-(5-Chloro-2-hydroxybenzylidene)-2-methoxybenzohydrazide

The title Schiff base compound, C₁₅H₁₃ClN₂O₃, was prepared by the reaction of equimolar quanti­ties of 5-chloro-2-hy­droxy­benzaldehyde with 2-meth­oxy­benzohydrazide in a methanol solution. The dihedral angle between the two benzene rings is 20.6 (3)°. An intra­molecular O—H⋯N hydrogen bond may influence the mol­ecular conformation. In the crystal structure, mol­ecules form chains along the b direction via inter­molecular N—H⋯O hydrogen bonds which are bifurcated involving an intra­molecular N—H⋯O hydrogen bond.

N'-[(2-Hydr-oxy-1-naphth-yl)methyl-idene]-2-nitro-benzohydrazide

In the title Schiff base compound, C₁₈H₁₃N₃O₄, prepared by the reaction of 2-hydr­oxy-1-naphthaldehyde with 2-nitro­benzohydrazide, the dihedral angle between the benzene ring and naphthyl ring system is 23.0 (2)°. There is an intra­molecular O—H⋯N hydrogen bond involving the naphthalene hydr­oxy substituent and a hydrazide N atom. In the crystal structure, symmetry-related mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains propagating in [101].

Dichlorido{2-[(2-isopropylammonioethyl)iminomethyl]-5-methoxyphenolato}zinc(II)

The Zn^II atom in the title compound, [ZnCl₂(C₁₃H₂₀N₂O₂)], is four-coordinated by the imine N and phenolate O atoms of the zwitterionic Schiff base ligand, and by two choride ions in a distorted tetra­hedral coordination. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O and N—H⋯Cl hydrogen bonds along [010].

2-Bromo-4-chloro-6-(cyclo-pentyl-imino-meth-yl)phenol

All atoms of the title mol-ecule, C(12)H(13)BrClNO, except the C and H atoms of the cyclo-pentane methyl-ene groups lie on a crystallographic mirror plane. The cyclo-pentane ring adopts an envelope conformation and an intra-molecular O-H⋯N hydrogen bond is observed. In the crystal, mol-ecules are stacked along the b axis by π-π inter-actions [centroid-centroid distance = 3.6424 (11) Å].

{4-Bromo-2-[2-(piperidin-1-ium-1yl)ethyl-iminometh-yl]phenolato}diiodido-zinc(II)

In the title complex, [ZnI(2)(C(14)H(19)BrN(2)O)], the Zn(II) atom is four-coordinated by the imine N and phenolate O atoms of the Schiff base ligand and by two iodide ions in a distorted tetra-hedral coordination. In the crystal structure, mol-ecules are linked through inter-molecular N-H⋯O hydrogen bonds, forming chains running along the b axis.

1-[(2-Anilinoethyl)iminiomethyl]-2-naphtholate

The title Schiff base compound, C₁₉H₁₈N₂O, was prepared by the reaction of equimolar quanti­ties of 2-hydr­oxy-1-naphthaldehyde with N-phenyl­ethane-1,2-diamine in a methanol solution. The mol­ecule adopts a zwitterionic conformation with the naphthyl OH group deprotonated and the imine N atom protonated. An intra­molecular N—H⋯O hydrogen bond forms between them. The dihedral angle between the benzene ring and the naphthyl system is 86.9 (2)°. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis.

{4-Bromo-2-[(2-morpholinoeth-yl)imino-meth-yl]phenolato}iodido(methanol)zinc(II)

The title compound, [Zn(C₁₃H₁₆BrN₂O₂)I(CH₃OH)], is a new mononuclear zinc(II) complex synthesized by the reaction of equimolar quanti­ties of 5-bromo­salicylaldehyde, 2-morpholinoethyl­amine and ZnI₂ in methanol. The Zn atom is four-coordinate in a distorted tetra­hedral geometry, binding to a phenolate O and an imine N atom of the Schiff base ligand, the O atom of a methanol mol­ecule and one I⁻ anion. In the crystal structure, adjacent mol­ecules are linked through inter­molecular O—H⋯O hydrogen bonds, forming centrosymmetric dimers.

Dichlorido{2-[3-(dimethyl-ammonio)-propyl-imino-meth-yl]phenolato}zinc(II) hemihydrate

The title complex, [ZnCl₂(C₁₂H₁₈N₂O)]·0.5H₂O, is a mononuclear zinc(II) compound derived from the zwitterionic form of the Schiff base 2-[3-(dimethyl­amino)propyl­imino­meth­yl]­phenol. The Zn^II atom is four-coordinated by the imine N and the phenolate O atoms of the Schiff base ligand, and by two chloride ions, in a distorted tetra­hedral coordination geometry. The dimethyl­ammonio group is disordered over two positions with site occupancies of 0.51 (3) and 0.49 (3). In the asymmetric unit, there is also a disordered water mol­ecule with a partial occupancy of 0.5. In the crystal structure, the water mol­ecules are linked to the Schiff base complex mol­ecules through inter­molecular N—H⋯O hydrogen bonds. Mol­ecules are further linked through additional inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis.

{(E)-2-[3-(Dimethyl-ammonio)propyl-iminometh-yl]phenolato}diiodidozinc(II)

The title complex, [ZnI₂(C₁₂H₁₈N₂O)], is a mononuclear zinc(II) compound derived from the zwitterionic form of the Schiff base (E)-2-[(3-dimethyl­amino­propyl­imino)meth­yl]phenol. The Zn^II atom is four-coordinated by the imine N and phenolate O atoms of the Schiff base ligand, and by two iodide ions in a tetra­hedral coordination geometry. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis.

Dibromido[N-propyl-N'-(2-pyridylmethyl-idene)ethane-1,2-diamine]zinc(II)

The title complex, [ZnBr₂(C₁₁H₁₇N₃)], is a mononuclear zinc(II) compound derived from the Schiff base N-propyl-N′-(1-pyridin-2-ylmethyl­idene)ethane-1,2-diamine. The Zn^II atom is five-coordinate, binding to the imine N, pyridine N, and amine N atoms of the Schiff base ligand and to two bromide anions in a distorted trigonal-bipyramidal coordination geometry. Adjacent mol­ecules are linked through inter­molecular N—H⋯Br hydrogen bonds, forming dimers.

Dibromido{(E)-2-eth-oxy-6-[3-(methyl-ammonio)propyl-iminometh-yl]phenol-ato}zinc(II)

The title complex, [ZnBr₂(C₁₃H₂₀N₂O₂)], is a mononuclear zinc(II) compound derived from the zwitterionic form of the Schiff base (E)-2-eth­oxy-6-((3-(methyl­amino)propyl­imino)meth­yl)phenol. The Zn^II atom is four-coordinated by the imine N and phenolate O atoms of the Schiff base ligand, and by two bromide ions, in a tetra­hedral coordination geometry. Adjacent mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis.

Bis{(E)-2-eth-oxy-6-[2-(ethyl-ammonio)ethyl-iminometh-yl]phenolato}nickel(II) bis(perchlorate)

In the title centrosymmetric mononuclear nickel(II) complex, [Ni(C₁₃H₂₀N₂O₂)₂](ClO₄)₂, the Ni^II atom is four-coordinated by the imine N and phenolate O atoms of the zwitterionic forms of two Schiff base ligands in a square-planar coordination geometry. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the a axis.

{(E)-2-Bromo-4-chloro-6-[3-(dimethyl-ammonio)propyl-imino-meth-yl]-phenol-ato}-dichloridozinc(II)

The title compound, [ZnCl₂(C₁₂H₁₆BrClN₂O)], is a mononuclear zinc(II) complex. The Zn^II atom is four-coordinate in a tetra­hedral geometry, binding to the phenolate O and imine N atoms of the zwitterionic Schiff base ligand and to two Cl⁻ ions. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯Cl hydrogen bonds to form chains running along the a axis.

Dichlorido{2-[2-(piperidin-1-yl)ethyl-imino-meth-yl]phenolato}zinc(II) monohydrate

In the title mononuclear zinc(II) complex, [ZnCl(2)(C(14)H(20)N(2)O)]·H(2)O, the Zn(II) atom is four-coordinated by the phenolate O and imine N atoms of the Schiff base ligand and by two Cl atoms in a tetra-hedral geometry. In the crystal structure, O-H⋯Cl, O-H⋯O and N-H⋯O hydrogen bonds involving the water mol-ecules bridge adjacent complexes into a ladder-like structure running along the c axis.