Solvent‐Directed Syntheses, Characterization, and Crystal Structures of Two Cobalt Complexes Derived from 4‐Nitro‐2‐(cyclopropyliminomethyl)phenol

  This work was supported by the National Natural Science Foundation of China (20571037).

Two new mononuclear Schiff base cobalt complexes, [Co^II(NCP)₂] (1) and [Co^III(NCP)₂(C₅H₅N)N₃] (2) (NCP=4‐nitro‐2‐(cyclopropyliminomethyl)phenolate), have been obtained from similar synthetic procedure and starting materials using solvent as the only independent variable. Complex 1 was synthesized and crystallized using MeOH as the solvent, while complex 2 was synthesized and crystallized using pyridine as the solvent. Both complexes have been characterized by elemental analysis, IR and single‐crystal X‐ray analysis. In 1, the Co^II ion is four‐coordinated by two imine N and two phenolate O atoms from two NCP ligands, forming tetrahedral coordination. While in 2, the Co^III ion is six‐coordinated by two imine N and two phenolate O atoms from two Schiff bases, by one terminal N atom of an azide anion, and by one N atom of a pyridine molecule, forming an octahedral coordination. The solvents used in the synthesis and crystallization of the Schiff base cobalt complexes can severely influence the final structures and the valences for the Co ions.

Keywords:

• synthesis
• Schiff base
• cobalt complex
• crystal structure
• IR spectra

Notes

  This work was supported by the National Natural Science Foundation of China (20571037).