{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]

Effects of Paramagnetic Ferrocenium Cations on the Magnetic Properties of the Anionic Single-Molecule Magnet [Mn12O12(O2CC6F5)16(H2O)4]-

The preparation and physical characterization are reported for several single-molecule magnet salts to investigate the effects of paramagnetic cations on the magnetization relaxation behavior of [Mn12]- anionic single-molecule magnets.Comment: 30 pages, 5 tables, 15 figure

Visualization of Weak Interaction Effects on N₂O Schiff Base Ligands in Iron(II) Spin Crossover Complexes

Single crystals of an iron(II) spin crossover (SCO) complex containing an N₂O Schiff base ligand, [FeII(qsal-COOH)₂], were successfully prepared. The crystal structures from a single-crystal X-ray diffraction study were obtained at 100 and 170 K and yielded information regarding both the low-spin and high-spin states, without any crystal breakage being observed after the phase transition. Structural analysis was performed to visualize the origin of the SCO phenomenon in the [FeII(qsal-COOH)₂] complex. We report that the fundamental requirements for an abrupt SCO, particularly in Fe-qsal complexes, are not only a combination of weak interaction effects, such as π–π, P4AE (parallel four-fold aryl embrace), and hydrogen bonding, but also the presence of solvents in the crystalline structure, since the solvent molecules can influence the interactions between the [FeII(qsal-X)₂] molecules

Synthesis and crystal structure of nickel(0) dicarbonyl complex with 4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole. [Ni(adpt)(CO)2]2・(adpt)2(thf)

[Abstract]A nickel(0) dicarbonyl complex [Ni(adpt)(CO)2]2・(adpt)2(thf) (1) (adpt=4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole) has been prepared and has been characterized crystallographically. Complex 1 has a triclinic, space group P1, a=11.473(6), b=15.779(3), c=8.179(1)Å, α=101.29(1), β=94.70(3), γ=102.87(3)°, V=1403.3(9)Å3, Z=1, R=0.036 and Rw=0.037. There includes two crystallographically different dicarbonyl nickel(0) complexes [Ni(adpt)(CO)2] (1a and 1b), two free adpt ligands and one solvated thf in a unit cell. On both complexes each Ni atom is coordinated by N atom from one side of two pyridyl groups in the coordinating adpt ligand, one N atom of triazole group and two terminal coordinating CO to provide the four-coordinate mononuclear structure in the distorted tetrahedral geometry. It was found that the Ni-CO bond is strengthened (shorter) and the C≡O bond is correspondingly weakened (longer), depending on the σ donation from N donor atom in the trans position

Crystal structure of 3,6-bis(dimethylamino)acridine hydroperchloride (acridine orange・HClO4)

[Abstract] Single crystals of 3,6-bis(dimethylamino)acridine hydroperchloride (acridine orange・HClO4) was prepared and molecular structure was crystallographically determined