Syntheses and Crystal Structures of Cobalt(III) and Manganese(III) Complexes With bis-Schiff Bases

Abstract

A new mononuclear Schiff base cobalt(III) complex, [Co(MEA) (N₃)(DMF)] (1), and a new mononuclear Schiff base manganese(III) complex, [Mn(EEA)(N₃)(OH₂)] (2) (MEA is bis (5-methoxysalicylidene)ethylenediamine; EEA is bis(6-ethoxys alicylidene)ethylenediamine), have been prepared and structurally characterized by physicochemical and single-cyrstal X-ray diffraction. Complex 1 crystallizes in the monoclinic space group P2₁/c with unit cell dimensions a = 9.910(1) Å, b = 19.279(1) Å, c = 12.410(1) Å, β = 102.729(2)°, V = 2312.8(2) ų, Z = 4, R ₁ = 0.0319, and wR ₂ = 0.0779. Complex 2 crystallizes in the monoclinic space group P2₁/c with unit cell dimensions a = 14.252(2) Å, b = 22.227(3) Å, c = 13.613(2) Å, β = 91.512(2)°, V = 4310.7(11) ų, Z = 8, R ₁ = 0.0392, and wR ₂ = 0.0839. The metal atom in each complex is in an octahedral coordination. Crystal of complex 2 was stabilized by hydrogen bonds.

Keywords:

• cobalt complex
• crystal structure
• manganese complex
• Schiff base
• synthesis