Tetra­kis(μ₃-2-{[1,1-bis­(hy­droxy­meth­yl)-2-oxidoeth­yl]imino­meth­yl}-6-nitro­pheno­lato)tetra­copper(II)

The title cluster, [Cu₄(C₁₁H₁₂N₂O₆)₄], was obtained from the Cu⁰–FeCl₂·4H₂O–H₄L–Et₃N–DMF reaction system (in air), where H₄L is 2-hy­droxy­methyl-2{[(2-hy­droxy-3-nitro­phen­yl)methyl­idene]amino}­propane-1,3-diol and DMF is di­methyl­formamide. The asymmetric unit consists of one Cu²⁺ ion and one dianionic ligand; a -4 symmetry element generates the cluster, which contains a {Cu₄O₄} cubane-like core. The metal ion has an elongated square-based pyramidal CuNO₄ coordination geometry with the N atom in a basal site. An intra­molecular O—H...O hydrogen bond is observed. The solvent mol­ecules were found to be highly disordered and their contribution to the scattering was removed with the SQUEEZE procedure in PLATON [Spek (2009). Acta Cryst. D65, 148–155], which indicated a solvent cavity of volume 3131 ų containing approximately 749 electrons. These solvent molecules are not considered in the given chemical formula.

Bis{2-[(pyridin-2-yl)methyl­idene­amino]­benzoato-κ³N,N′,O}chromium(III) nitrate monohydrate

The title complex salt hydrate, [Cr(C₁₃H₉N₂O₂)₂]NO₃·H₂O, comprises discrete cations, nitrate anions and solvent water mol­ecules. The Cr^III atom is octa­hedrally coordinated by two anionic Schiff base ligands with the O atoms being cis. The two ligands differ significantly with dihedral angles between the pyridine and benzene rings of 4.8 (2) and 24.9 (2)°. The nitrate anion and solvent water mol­ecule were modelled as being disordered, with the major components having site-occupancy values of 0.856 (14) and 0.727 (16), respectively. The crystal is built of alternating layers of cations and of anions plus water mol­ecules, stacked along the c axis.

Chlorido­bis­(1,10-phenanthroline-κ²N,N′)copper(II) chlorido­(1,10-phen­anthroline-κ²N,N′)(pyridine-2,6-di­carboxyl­ato-κ³O²,N,O⁶)manganate(II) methanol monosolvate

The title complex, [CuCl(C₁₂H₈N₂)₂][Mn(C₇H₃NO₄)Cl(C₁₂H₈N₂)]·CH₃OH, consists of discrete [CuCl(phen)₂]⁺ cations (phen is 1,10-phenanthroline), [MnCl(pydc)(phen)]⁻ anions (H₂pydc is 2,6-pyridine-2,6-di­carb­oxy­lic acid) and one methanol solvent mol­ecule of crystallization per asymmetric unit. It should be noted, that a solvent-masking procedure as implemented in OLEX2 [Dolomanov et al. (2009). J. Appl. Cryst. 42, 339–341] was used to remove the electronic contribution from one disordered solvent molecule, presumably methanol. Only the atoms used in the refined model are reported in chemical formula and related values. The Cu^II ion is five-coordinated by two phenanthroline ligands and one chloride ion in a distorted trigonal–bipyramidal geometry. The dihedral angle between the phen ligands is 65.21 (5)°. The Mn^II ion is six-coordinated by one Cl atom, two N atoms from a phen ligand, as well one N atom and two O atoms from pydc in a distorted octa­hedral coordination geometry, with cis angles ranging from 72.00 (8) to 122.07 (8)° and trans angles ranging from 143.98 (8) to 163.15 (6)°. In the crystal, C—H...O, O—H...O and C—H...Cl hydrogen bonds, cation–anion π–π inter­actions between the phen ring systems with centroid–centroid distances in the range 3.881 (34)–4.123 (36) Å, as well as cation–cation, anion–anion π–π inter­actions between the phen rings with centroid–centroid distances in the range 3.763 (4)–3.99 (5) Å and pydc rings with centroid–centroid distances 3.52 (5) Å link the various components.

Crystal structure of bis­(2-{[(pyridin-2-yl)methyl­idene]amino}­benzoato-κ³N,N′,O)cobalt(II) N,N-di­methyl­formamide sesquisolvate

The coordination geometry around the central Co^II ion is unexpectedly different from that for the co-crystal of the title mol­ecule with anthranilic acid.