Synthesis, Crystal Structure, and Spectrum Properties of Cobalt(II) Complexes Based on Tridentate 1,3‐Bis(benzimidazol‐2‐yl)‐2‐oxopropane Ligand and Derivative

Abstract

Two new cobalt(II) complexes [Co(obb)2](pic)2·3(C2H3N) (1) and [Co(Etobb)2](pic)2·2DMF (2) were prepared by the reaction of cobalt(II) picrate with the ligands 1,3‐bis(benzimidazol‐2‐yl)‐2‐oxopropane (obb) and 1,3‐bis(1‐ethylbenzimidazol‐2‐yl)‐2‐oxopropane (Etobb), respectively. Single crystal X‐ray diffraction revealed that [Co(obb)2]2+ and [Co(Etobb)2]2+ have a different arrangement. In complex 1 the coordination sphere around cobalt(II) is distorted tetrahedral, whereas in complex 2 the coordination sphere around cobalt(II) is distorted octahedral (where the N4 equatorial plane is formed by four benzimidazoles nitrogen atoms and the axial positions are occupied by two oxygen atoms from the two ligands). The complexes were also identified by IR and UV/Vis spectroscopy.

Crystal structure of 2,2'-(1,2-ethylenedioxy)bisbenzaldehyde O,O'-dimethyldioxime, C18H20N2O4

“…The two planes of benzene rings form adihedral angle of 77.07°. The bond angles ÐC5-O1-C1 = 118.6(2)°, ÐC13-O2-C2 =117.6(3)°, ÐO2-C2-C1 =108.4(3)°a nd ÐO1-C1-C2 =1 08.4(3)°in the C-O-CH 2 -CH 2 -O-C linkage are all different.Every molecule is linked to four other molecules via C-H×××Oa nd C-H×××p interactions, forming a3 D supramolecular structure [11,12]. …”

Crystal structure of bis(4-hydroxybenzaldehyde) O,O'-(butane-1,4-diyl)dioxime, C18H20N2O4

“…Within the molecule, the planar units are parallel but extend in opposite directions from the methylene bridge. Thetwo benzenerings areparalleltoeach other with adistance of 1.336Å.Inthe crystal packing, weak intermolecular C-H×××Ohy-drogen bonds link each molecule to four others, forming an infinite one-dimensional supramolecular structure along b axis [11,12]. …”

A Supramolecular Copper(II) Complex Bearing Salen-Type Bisoxime Ligand: Synthesis, Structural Characterization, and Thermal Property

“…Consequently, a self-assembling continual supramolecular structure is formed by intermolecular hydrogen bonds with the nearest Cu···Cu distance of 5.008 Å. [25,26] In addition, the two neighboring benzene rings are not parallel to each other, the dihedral angle between which is 2.32(3) • , exhibiting no intermolecular π -π stacking interactions between the nearest benzene rings.…”