{6,6′-Dimeth­oxy-2,2′-[o-phenyl­enebis(nitrilo­methyl­idyne)]diphenolato}cobalt(II) dichloro­methane disolvate

The title compound, [Co(C22H18N2O4)]·2CH2Cl2, was isolated from the reaction of N,N′(o-phenyl­ene)bis­(vanillalimine) (H2 L) with Co(SCN)2. The crystal structure contains a CoII ion surrounded by the L 2− ligand in a slightly distorted square-planar fashion. Inter­molecular C—H⋯O hydrogen-bonding contacts between the dichloro­methane solvent mol­ecules and the meth­oxy or carboxyl­ate O atoms are observed in the crystal structure. The planar complex mol­ecules stack through inversion related π–π inter­actions between the six-membered rings of the vanillalimine half ligands. The distance between centroids is 3.498 (2) Å and the perpendicular distance is 3.345 Å. A partial stacking is observed with a centroid–centroid distance of 3.830 (2) Å, a perpendicular distance of 3.350 Å and a slippage of 1.856 Å

{6,6′-Dimeth­oxy-2,2′-[naphthalene-2,3-diylbis(nitrilo­methyl­idyne)]diphenolato}thio­cyanato­cobalt(III) diethyl ether dichloro­methane solvate

In the title complex, [Co(C26H20N2O4)(NCS)]·C4H10O·CH2Cl2, the penta­coordinated CoIII atom exhibits a distorted square-pyramidal geometry with an N,N′,O,O′ tetra­dentate Schiff base ligand in the basal plane and one thio­cyanate ligand at the apical site. The diethyl ether mol­ecule is located in a cavity provided by four O atoms of the ligand with weak C—H⋯O inter­actions, generating two short O⋯O contact distances [2.766 (3) and 2.745 (3) Å] between the diethyl ether mol­ecule and the ligand. The crystal structure is stabilized by the weak C—H⋯O and C—H⋯N inter­actions and π–π inter­actions between the naphthyl ring system and the benzene ring [centroid–centroid distance = 3.657 (5) Å] and between the two naphthyl ring systems [centroid–centroid distance = 4.305 (2) Å]

The observation of isocyano cobalt (III)-Schiff base complexes

[Abstract] Two isocyano-coordinated cobalt(III)-Schiff base complexes, [Co(L1)(CH_3OH)(NC)]・CH_2Cl_2 (1) and [Co(L2)(H_2O)(NC)]•CH_2Cl_2 (2) (H_2L1＝ N,N-disalicylidene-2,3-naphthalenediimine, H_2L2 ＝ N,N-bis(3-methoxysalicylaldehyde)-1,2-phenylene-diimine), were synthesized from the reaction of TCNQ and corresponding planar cobalt(II) complexes 3 and 4, respectively. The single-crystal X-ray diffraction analysis of the crystals clearly shows the coordination of C1^- moiety to the Co(III) complex. The characterization of products by the FT-IR and C^ NMR measurements indicate the coexistence of two isomers, isocyano and cyano complexes, both in the solid state and in solution. The DFT calculations on the isomerization reaction (ΔH_: -42.6 kJ mot^, E_a: 121.3 kJ mol^) indicate the difficulty of the reaction at room temperature, which is in accordance with the observation of the two isomers