Synthesis, Crystal Structure, and Magnetic Property of four Manganese(II) Complexes with Bulky Schiff bases Derived from Amantadine and Rimantadine

Abstract

The reactions of manganese(II) chloride tetrahydrate and four bulky Schiff base ligands derived from amantadine (or rimantadine) and salicylaldehyde (or 4-methoxysalicylaldehyde) generated four novel complexes, C₃₄H₄₂Cl₂MnN₂O₂ (I), C₃₆H₄₆Cl₂MnN₂O₄ (II), C₃₈H₅₀Cl₂MnN₂O₂ (III), and C₄₀H₅₄Cl₂MnN₂O₄ (IV), respectively. These complexes were characterized by melting point, infrared spectra, elemental analysis, magnetic susceptibility, molar conductance and single-crystal X-ray diffraction (CIF files CCDC nos. 1 540 253 (I), 1 540 254 (II), 1 540 255 (III), 1 540 256 (IV)). Single-crystal X-ray diffraction analysis reveals that I, III and IV crystallize in the orthorhombic system with space groups P2₁2₁2₁, Pbcn and Pcan, respectively, whereas II crystallizes in the monoclinic system with space group P2₁/n. Each asymmetric unit for I–IV consists of one manganese(II) atom, two Schiff base ligands and two chlorine atoms. The central manganese(II) atoms lie on a twofold rotation axis in III and IV, whereas manganese(II) atoms lie on general positions in I and II. In these complexes molecules, manganese(II) atoms is four-coordinated via two chlorine atoms and two oxygen atoms from the corresponding Schiff base ligands, forming a distorted tetrahedral geometry.