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The asymmetric unit of the title compound, [ZnCl2(C14H14N4)]n, contains a ZnII ion situated on a twofold rotation axis and one-half of a 1-{4-[(1H-imidazol-1-yl)methyl]benzyl}-1H-imidazole (L) ligand with the benzene ring situated on an inversion center. The ZnII ion is coordinated by two chloride anions and two N atoms from two L ligands in a distorted tetrahedral geometry. The L ligands bridge ZnCl2 fragments into polymeric chains parallel to [20-1].

In the title hetero-dinuclear complex, [CuSm(C22H24N2O4)Cl3(CH3OH)2], the CuII cation is N,N′,O,O′-chelated by a 6,6′-dimethoxy-2,2′-[cyclohexane-1,2-diylbis(nitrilomethanylylidene)]diphenolate ligand, and one Cl− anion further coordinates to the CuII cation to complete the distorted square-pyramidal coordination geometry, while the SmIII cation is chelated by four O atoms from the same ligand, and is further coordinated by two methanol molecules and two Cl− anions in an bicapped trigonal–prismatic geometry. Intra- and intermolecular O—H...Cl hydrogen bonds are present in the structure.

In the title compound, [ZnCl2(C20H18N4)]n, the ZnII ion lies on a twofold rotation axis and is four-coordinated in a tetrahedral geometry defined by two Cl anions and two N atoms from two 4,4′-bis[(imidazol-1-yl)methyl]biphenyl ligands. The mid-point of the ligand is located on an inversion center, and shows a trans conformation. The ligands link the ZnII ions, forming a chain structure along [10-1].

The title complex, [Er(C32H16N8)(C5H7O2)(C12H8N2)], possesses a mirror plane and the asymmetric unit is half of the molecule. The ErIII cation, lying on the mirror plane, is eight-coordinated by two O atoms from acetylacetone, two N (Nphen) atoms from 1,10-phenanthroline and four isoindole N (Niso) atoms from the phthalocyanine ligand in an antiprismatic geometry. The Er—N distances are in the range 2.376 (5)–2.529 (4) Å and the Er—O distance is 2.272 (3) Å. Notably, the Er—Niso bonds are shorter than the Er—Nphen bonds, but longer than the Er—O bonds.

In the anion of the title salt, C6H16N+·C18H13O8−, one of the carboxyl groups is deprotonated. Its O atoms are involved in intermolecular hydrogen bonding with the carboxyl group of an adjacent anion and the amino group of an adjacent cation. The two benzoyloxy rings are oriented with respect to each other at a dihedral angle of 79.46 (6)°.

In the title complex, [Co(C22H18N2O4)(CN)(H2O)]·0.5CH3CN, the CoIII cation is N,N′,O,O′-chelated by a 6,6′-dimethoxy-2,2′-[1,2-phenylenebis(nitrilomethanylylidene)]diphenolate dianion, and is further coordinated by a cyanide anion and a water molecule in the axial sites, completing a distorted octahedral coordination geometry. In the crystal, pairs of bifurcated O—H...(O,O) hydrogen bonds link adjacent molecules, forming centrosymmetric dimers. The acetonitrile solvent molecule shows 0.5 occupancy.

In the title compound, [KYb(C2O4)2(H2O)4]n, the YbIII ion lies on a site of overline{4} symmetry in a dodecahedral environment defined by eight O atoms from four oxalate ligands. The K atom lies on a different overline{4} axis and is coordinated by four O atoms from four oxalate ligands and four water O atoms. The oxalate ligand has an inversion center at the mid-point of the C—C bond. The metal ions are linked by the oxalate ligands into a three-dimensional framework. O—H...O hydrogen bonding is present in the crystal structure.

In the title compound, [KLu(C2O4)2(H2O)4]n, the LuIII ion lies on a site of overline{4} symmetry in a dodecahedron defined by eight O atoms from four oxalate ligands. The K atom lies on another site of the same symmetry and is coordinated by four oxalate O atoms and four O water atoms. The mid-point of the C—C bond of the oxalate group lies on an inversion center. In the packing structure, each oxalate ligand links two Lu(III) and two K atoms, forming a three-dimensional open framework with channels running along [001]. Intermolecular O—H...O hydrogen bonds occur.

In the heterodinuclear title complex, [GdZn(C22H18N2O4)(CH3COO)3], the ZnII ion is five-coordinated in a square-pyramidal environment defined by two O atoms and two N atoms from the ligand, forming the square plane, and one acetate O atom serving as the apex, while the GdIII ion is nine-coordinated in an approximate mono-capped tetragonal–antiprismatic environment defined by four O atoms from the ligand and five acetate O atoms.

In the title complex, [Co(C22H18N2O4)(CN)(H2O)]·CH3CN, the CoIII ion is six-coordinated in a distorted octahedral environment defined by two N atoms and two O atoms from a salen ligand in the equatorial plane and one O atom from a water molecule and one C atom from a cyanide group at the axial positions. O—H...O hydrogen bonds connect adjacent complex molecules into dimers. C—H...N hydrogen bonds and π–π interactions between the benzene rings [centroid–centroid distances = 3.700 (2) and 3.845 (2) Å] are also present.

In the title mononuclear salen-type complex, [Eu(NO3)3(C22H26N2O4)]·CH3OH, the EuIII ion is ten-coordinated by three bidentate nitrate counter-ions and one organic salen-type ligand, which acts in a bis-bidentate chelating mode through its phenolate and methoxy O atoms. The protonated imine groups are involved in intramolecular N—H...O hydrogen bonds to the phenolate O atomss, emphasizing the zwitterionic nature of the ligand. An O—H...O hydrogen bond links the complex and solvent molecules.

In the title dinuclear CuII–LuIII salen-type complex, [CuLu(C22H24N2O4)(NO3)3], with the ligand 6,6′-dimethoxy-2,2′-[cyclohexane-1,2-diylbis(nitrilomethylidyne)]diphenolate, the irregular nine-coordinate LuIII coordination sphere comprises four O atoms from the ligand and five O atoms from three nitrate groups, two bidentate and one monodentate [Lu—O = 2.230 (3)–2.621 (4) Å]. The slightly distorted square-planar four-coordinate CuII atom comprises two imine N atoms [Cu—N = 1.903 (4) and 1.912 (4) Å] and two phenolate O atoms from the ligand molecule [Cu—O = 1.897 (3) and 1.906 (3) Å]. All atoms of the cyclohexane ring of the ligand molecule are disordered over two sets of sites with equal occupancy.

In the title dinuclear salen-type complex, [CuEu(C22H24N2O4)(NO3)3(CH3OH)], the CuII ion is five-coordinated to two imine N atoms and two phenolate O atoms and one O from the bridging nitrate group. The EuIII ion is ligated to three nitrate groups, four O atoms from the salen-type ligand and one methanol molecule, leading to a distorted tenfold coordination for the rare earth cation. One of the three nitrate anions is disordered over two positions in a 0.66 (5):0.34 (5) ratio.

The molecule of the title compound, C22H26N2O4, has two azomethine linkages, both of which are in an E configuration. The cyclohexyl ring adopts a chair conformation. The dihedral angle between the benzene rings is 66.57 (9)°. The molecular structure is stabilized by two intramolecular O—H...N hydrogen bonds.

In the title mononuclear complex, [La(NO3)3(C22H26N2O4)]·CH3OH, the LaIII ion is coordinated by three bidentate nitrate counter-ions and one zwitterionic 6,6′-dimethoxy-2,2′-[(cyclohexane-1,2- diyl)bis(nitriliomethylidyne)]diphenolate ligand through two phenolate and two methoxy O atoms, while the protonated N atoms remain uncoordinated. H atoms located on the two N atoms are involved in intramolecular hydrogen bonds with the deprotonated phenol O atoms, indicating that proton migration occurs during the lanthanum complexation.

In the mononuclear salen-type complex, [Er(NO3)3(C18H20N2O4)], the ErIII ion is ten-coordinated in a distorted hexadecahedral geometry by six O atoms of three nitrate anions and four O atoms of the salen-like ligand. Intermolecular N—H...O hydrogen bonds occur. The crystal structure is stabilized by intermolecular C—H...O hydrogen bonds.

In the title mononuclear Schiff base complex, [Dy(NO3)3(C18H20N2O4)], the DyIII ion is ten-coordinated in a distorted hexadecahedral geometry by six O atoms of three nitrate anions and four O atoms of the Schiff base ligand. An intramolecular N—H...O hydrogen bond occurs. The crystal structure is stabilized by intermolecular C—H...O hydrogen bonds.

In the title compound, C18H16N2O2, the phenylene ring is located on inversion center. The pyridyl ring makes a dihedral angle of 39.9 (1)° with the phenylene ring. In the crystal, adjacent molecules are linked by intermolecular C—H...N hydrogen bonds, forming a linear chain along the a axis.

In the title heteronuclear complex, [CuTb(C19H20N2O4)(NO3)3(CH3COCH3)], the CuII ion is five-coordinated by two O and two N atoms from the 6,6′-dimethoxy-2,2′-[propane-1,2-diylbis(nitrilomethylidyne)]diphenolate ligand (L) and an O atom from the acetone molecule in a square-pyramidal geometry. The TbIII ion is ten-coordinated by six O atoms from three chelating nitrate ligands and four O atoms from the L ligand. In L, the CH2–CH–CH3 fragment is disordered over two conformations, with refined occupancies of 0.725 (11) and 0.275 (11).

In the title complex, [Co(C22H24N2O4)]·H2O, the CoII atom is in an almost square-planar coordination environment involving two O and two N atoms from the Schiff base ligand. A water molecule cocrystallizes with the coordination compound and may be held in the crystal by O—H...O hydrogen bonds. Heteroatomic π–π ring interactions may be present between symmetry-related complexes, with centroid–centroid distances of 3.5661 (8) Å.

In the title complex, [Fe(C22H24N2O4)]·H2O, the FeII center is four-coordinated by two O and two N atoms from 2,2′-[6,6′-dimethoxycyclohexane-1,2-diylbis(nitrilomethylidyne)]diphenolate (L) ligands in a distorted square-planar geometry. Uncoordinated water and FeL molecules are paired via intermolecular water–methoxy O—H...O hydrogen bonds.

The asymmetric unit of the title compound, [Fe4(C9H8O2)4(CH3OH)2], contains one half-molecule located on a twofold rotational axis. In the molecule, the two FeII ions bridged by two coordinating methanol molecules are separated by 3.1286 (7) Å. Two crystallographically independent methanol molecules are situated on a twofold rotational axis; all attached H atoms are rotationally disordered between two equal orientations.

In the title complex, [CuEu(C19H20N2O4)(NO3)3], the CuII ion is four-coordinated in a square-planar geometry by two O atoms and two N atoms of the deprotonated Schiff base. The EuIII atom is ten-coordinate, chelated by three nitrate groups and linked to the four O atoms of the deprotonated Schiff base.