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The mol-ecular bis-chelate complex (2-{[(2-hy-droxy-ethyl-κ O )amino-κ N ]meth-yl}-6-meth-oxy-phenolato-κ O )(2-{[(2-hy-droxy-eth-yl)imino-κ N ]meth-yl}-6-meth-oxy-phenolato-κ O )copper(II), [Cu(C 10 H 14 NO 3 )(C 10 H 12 NO 3 )] or [Cu(H L im )(H L am ); H L im = C 10 H 14 NO 3 ; H L am = C 10 H 12 NO 3 , represents the first compound containing a salicyl-idene-2-ethano-lamine type ligand in both imino H L im (Schiff base) and amino H L am (reduced Schiff base) forms that has been structurally characterized on the basis of X-ray data. Two mol-ecules of the monodeprotonated ligands coordinate the Cu II ion in an ( N , O phen )-bidentate and an ( N , O phen , O alc )-tridentate fashion in the case of the imino and amino forms, respectively. The shape of the CuN 2 O 3 coordination polyhedron is a distorted square-pyramid (geometry index τ 5 = 0.26). Inter-molecular N-H⋯O and O-H⋯O hydrogen bonds, involving H atoms of the amino and hy-droxy-ethyl groups, create a two-dimensional supra-molecular array extending parallel to (010)., (© Plyuta et al. 2021.)

The title Co III complex, bis-[bis-(2-hy-droxy-3-meth-oxy-benzaldehyde thio-semi-carbazonato)cobalt(III)] di-thio-nate-dimethylformamide-methanol (1/4/3), [Co(C 9 H 10 N 3 O 2 S) 2 ] 2 (S 2 O 6 )·4C 3 H 7 NO·3CH 3 OH, with monodeprotonated 2-hy-droxy-3-meth-oxy-benzaldehyde thio-semicarbazone as ligands crystallizes in the space group P . The asymmetric unit consists of two mononuclear [Co L 2 ] + cations, one di-thio-nate anion (S 2 O 6 ) 2- as counter-anion and seven solvate mol-ecules (four di-methyl-methanamide and three methanol). Each Co III ion has a moderately distorted octa-hedral S 2 N 2 O 2 geometry. In the crystal, the components are linked by numerous N-H⋯O and O-H⋯O contacts., (© Rusanova et al. 2021.)

The title compound, [Fe(C 3 H 7 NO) 6 ][Cd 2 Cl 7 ], crystallizes in the trigonal space group R and is assembled from discrete [Fe(DMF) 6 ] 3+ cations (DMF = N , N -di-methyl-formamide) and [Cd 2 Cl 7 ] 3- anions. In the cation, the iron(III) atom, located on a special position of site symmetry, is coordinated by six oxygen atoms from DMF ligands with all Fe-O distances being equal [2.0072 (16) Å]. A slight distortion of the octa-hedral environment of the metal comes from the cis O-Fe-O angles deviating from the ideal value of 90° [86.85 (7) and 93.16 (7)°] whilst all the trans angles are strictly 180°. The central Cl atom of the [Cd 2 Cl 7 ] 3- anion is also located on a special position of site symmetry and bridges two corner sharing, tetra-hedrally coordinated Cd II atoms. The two Cd atoms and the central Cl atom are colinear. The two sets of terminal chloride ligands on either side of the dumbbell-like anion are rotated relative to each other by 30°. In the crystal, the cations and anions, stacked one above the other along the c -axis direction, are held in place principally by electrostatic inter-actions. There are also C-H⋯Cl and C-H⋯O inter-actions, but these are rather weak. Of the six crystal structures reported to date for ionic salts of [Fe(DMF) 6 ] n + cations ( n = 2, 3), five contain Fe II ions. The title compound is the second example of a stable compound containing the [Fe(DMF) 6 ] 3+ cation. The existence of both [Fe(DMF) 6 ] 2+ and [Fe(DMF) 6 ] 3+ cations shows that the DMF ligand coordination sphere can accommodate changes in the charge and spin states of the metal centre., (© Vassilyeva et al. 2021.)

The new heterometallic complex, aqua-1κ O -bis-(μ 2 -2-imino-methyl-6-meth-oxy-phenolato-1κ 2 O 1 , O 6 :2κ 2 O 1 , N )bis-(thio-cyanato-1κ N )calcium(II)copper(II), [CaCu(C 8 H 8 NO 2 ) 2 (NCS) 2 (H 2 O)], has been synthesized using a one-pot reaction of copper powder, calcium oxide, o -vanillin and ammonium thio-cyanate in methanol under ambient conditions. The Schiff base ligand (C 8 H 9 NO 2 ) is generated in situ from the condensation of o -vanillin and ammonia, which is released from the initial NH 4 SCN. The title compound consists of a discrete binuclear mol-ecule with a {Cu(μ-O) 2 Ca} core, in which the Cu⋯Ca distance is 3.4275 (6) Å. The coordination geometries of the four-coordinate copper atom in the [CuN 2 O 2 ] chromophore and the seven-coordinate calcium atom in the [CaO 5 N 2 ] chromophore can be described as distorted square planar and penta-gonal bipyramidal, respectively. In the crystal, O-H⋯S hydrogen bonds between the coordinating water mol-ecules and thio-cyanate groups form a supra-molecular chain with a zigzag-shaped calcium skeleton., (© Plyuta et al. 2020.)

A new organic-inorganic hybrid salt [ L ] 2 [MnCl 4 ] (I) where L + is the 2-methyl-3-(pyridin-2-yl)imidazo[1,5- a ]pyridinium cation, is built of discrete organic cations and tetra-chlorido-manganate(II) anions. The L + cation was formed in situ in the oxidative cyclo-condensation of 2-pyridine-carbaldehyde and CH 3 NH 2 ·HCl in methanol. The structure was refined as a two-component twin using PLATON (Spek, 2020 ▸) to de-twin the data. The twin law (-1 0 0 0 - 1 0 0.5 0 1) was applied in the refinement where the twin component fraction refined to 0.155 (1). The compound crystallizes in the space group P 2 1 / c with two crystallographically non-equivalent cations in the asymmetric unit, which possess similar structural conformations. The fused pyridinium and imidazolium rings of the cations are virtually coplanar [dihedral angles are 0.89 (18) and 0.78 (17)°]; the pendant pyridyl rings are twisted by 36.83 (14) and 36.14 (13)° with respect to the planes of the remaining atoms of the cations. The tetra-hedral MnCl 4 2- anion is slightly distorted with the Mn-Cl distances falling in the range 2.3469 (10)-2.3941 (9) Å. The distortion value of 0.044 relative to the ideal tetra-hedron was obtained by continuous shape measurement (CShM) analysis. In the crystal, the cations and anions form separate stacks propagating along the a- axis direction. The organic cations display weak π-π stacking. The anions, which are stacked identically one above the other, demonstrate loose packing; the minimum Mn⋯Mn separation in the cation stack is approximately 7.49 Å. The investigation of the fluorescent properties of a powdered sample of (I) showed no emission. X-band EPR data for (I) at 293 and 77 K revealed broad fine structure signals, indicating moderate zero-field splitting., (© Vassilyeva et al. 2020.)

In the title complex, [Ca(C7H5O2)2(C2H6OS)] n , the Ca(2+) ion (site symmetry m..) is surrounded by eight O atoms, six from two bridging-chelating tridentate benzoate carboxyl groups and two from a bridging dimethyl sulfoxide mol-ecule (point group symmetry m..), giving an irregular coordination geometry [Ca-O bond length range = 2.345 (2)-2.524 (2) Å]. One-dimensional coordination complex chains extending parallel to c are generated in which the triply μ2-O-bridged Ca(2+) cations are separated by 3.6401 (5) Å. In the crystal, weak intra-chain C-H⋯π hydrogen bonds are present between the methyl H atoms of the dimethyl sulfoxide mol-ecules as donors and the aromatic rings as acceptors [C-H⋯Cg = 3.790 (4) Å].