Veebipõhiste keskkondade lõimimine õppetöösse ning õpetajate arvamus nende mõjust õpilaste digipädevusele

https://www.ester.ee/record=b5196640*es

{1,1′-[Butane-1,4-diylbis(nitrilo­methyl­idyne)]di-2-naphtho­lato}copper(II) ethanol monosolvate

The asymmetric unit of the title compound, [Cu(C26H22N2O2)]·C2H5OH, comprises a Schiff base complex and an ethanol mol­ecule of crystallization. The CuII atom shows a distorted square-planar geometry. The dihedral angle between the two aromatic rings is 48.16 (13)°. The crystal structure is stabilized by inter­molecular O—H⋯O and C—H⋯O hydrogen bonds and inter­molecular π–π inter­actions with centroid–centroid distances in the range 3.485 (2)–3.845 (3) Å

{4,4′,5,5′-Tetra­methyl-2,2′-[1,1′-(ethane-1,2-diyldinitrilo)diethyl­idyne]diphenolato}nickel(II)–methanol–chloro­form (1/1/1)

In the title compound, [Ni(C22H26N2O2)]·CH3OH·CHCl3, the NiII ion is in a slightly distorted square-planar geometry involving an N2O2 atom set of the tetra­dentate Schiff base ligand. The asymmetric unit contains one mol­ecule of the complex and one mol­ecule each of chloro­form and methanol. The methanol mol­ecule is hydrogen bonded to the phenolate O atoms. In the crystal structure, short inter­molecular distances between the centroids of six-membered chelate rings [3.7002 (9) Å] indicate the presence of π–π inter­actions, which link the mol­ecules into stacks along the a axis. In addition, there are Ni⋯Ni distances which are shorter than the sum of the van der Waals radii of two Ni atoms. The crystal structure is further stabilized by inter­molecular O—H⋯O and C—H⋯O hydrogen bonds, and weak inter­molecular C—H⋯π inter­actions linking mol­ecules into extended one-dimensional chains along the c axis

(E,E)-N 1,N 4-Bis(2,6-difluoro­benzyl­idene)butane-1,4-diamine

The asymmetric unit of the title compound, C18H16F4N2, comprises two half crystallographically independent potentially bidentate Schiff base ligands, with an inversion centre located at the mid-point of the central C—C bond. The crystal packing is stabilized by inter­molecular C—H⋯F and π–π inter­actions [centroid–centroid distance = 3.8283 (11) Å]

{4,4′,6,6′-Tetra­bromo-2,2′-[(2,2-dimethyl­propane-1,3-di­yl)bis­(nitrilo­methanylyl­idene)]diphenolato}copper(II)

In the title compound, [Cu(C19H16Br4N2O2)], the CuII ion and the substituted C atom of the diamine fragment lie on a crystallographic twofold rotation axis. The geometry around the CuII ion is distorted square-planar, which is defined by the N2O2 donor atoms of the coordinated Schiff base ligand. The dihedral angle between the symmetry-related substituted benzene rings is 25.33 (14)°. The crystal structure is stabilized by an inter­molecular π–π inter­action [centroid–centroid distance = 3.8891 (18) Å]

{6,6′-Dimeth­oxy-2,2′-[4,5-dimethyl-o-phenyl­enebis(nitrilo­methyl­idyne)]diphenolato}nickel(II)

In the title Schiff base complex, [Ni(C24H22N2O4)], the NiII atom has a slightly distorted square-planar coordination environment. The dihedral angles between the central benzene ring and the two outer rings are 7.62 (16) and 9.78 (17)°. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen bonds and π–π inter­actions with a centroid–centroid distance of 3.8218 (19) Å

Bis(2-hydroxy­benzaldehyde oxime) O,O′-butane-1,4-diyldicarbonyl ether

The mol­ecule of the title compound, C20H20N2O6, lies across a crystallographic inversion centre, the asymmetric unit comprising one half-mol­ecule. An intra­molecular O—H⋯N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. Pairs of inter­molecular C—H⋯O hydrogen bonds link neighbouring mol­ecules into a layer with R 2 2(38) ring motif. The crystal structure is further stabilized by the inter­molecular C—H⋯π inter­actions

{5,5′-Dihydr­oxy-2,2′-[o-phenyl­enebis­(nitrilo­methyl­idyne)]diphenolato}nickel(II) dihydrate

In the title complex, [Ni(C20H14N2O4)]·2H2O, the NiII ion is in an essentially square-planar geometry involving an N2O2 atom set of the tetra­dentate Schiff base ligand. The Ni atom lies on a crystallographic twofold rotation axis. The asymmetric unit contains one half-mol­ecule of the complex and a water mol­ecule. An inter­molecular O—H⋯O hydrogen bond forms a four-membered ring, producing an R 1 2(4) ring motif involving a bifurcated hydrogen bond to the phenolate O atoms of the complex mol­ecule. In the crystal structure, mol­ecules are linked by π–π stacking inter­actions, with centroid–centroid distances in the range 3.5750 (11)–3.7750 (11) Å. As a result of the twofold symmetry, the central benzene ring makes the same dihedral angle of 15.75 (9)° with the two outer benzene rings. The dihedral angle between the two hydroxy­phenyl rings is 13.16 (5)°. In the crystal structure, mol­ecules are linked into infinite one-dimensional chains by directed four-membered O—H⋯O—H inter­actions along the c axis and are further connected by C—H⋯O and π–π stacking into a three-dimensional network. An inter­esting feature of the crystal structure is the short Ni⋯O, O⋯O and N⋯N inter­actions which are shorter than the sum of the van der Waals radii of the relevant atoms. The crystal structure is stabilized by inter­molecular O—H⋯O and C—H⋯O hydrogen bonds and by π–π stacking inter­actions

{4,4′-Dimeth­oxy-2,2′-[1,1′-(ethane-1,2-diyldinitrilo)diethyl­idyne]diphenolato}nickel(II) hemihydrate

In the title complex, [Ni(C20H22N2O4)]·0.5H2O, the NiII ion is in a slightly distorted square-planar geometry involving an N2O2 atom set of the tetra­dentate Schiff base ligand. The asymmetric unit contains one mol­ecule of the complex and half a water solvent mol­ecule. The solvent water mol­ecule lies on a crystallographic twofold rotation axis. An inter­molecular O—H⋯O hydrogen bond forms an R 2 1(4) ring motif involving a bifurcated hydrogen bond to the phenolate O atoms of the complex. In the crystal structure, mol­ecules are linked by π–π stacking inter­actions, with centroid–centroid distances in the range 3.5310 (11)–3.7905 (12) Å, forming extended chains along the b axis. In addition, there are Ni⋯Ni and Ni⋯N inter­actions [3.4404 (4)–4.1588 (4) and 3.383 (2)–3.756 (2) Å, respectively] which are shorter than the sum of the van der Waals radii of the relevant atoms. Further stabilization of the crystal structure is attained by weak inter­molecular C—H⋯O and C—H⋯π inter­actions