Synthesis, Structure and Magnetic Properties of a Chiral One-Dimensional Molecular-Based Magnet

• Published in: Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Vol. 343; no. 1; pp. 97 - 102
• Main Authors: Kumagai, Hitoshi, Markosyan, Ashot, Inoue, Katsuya
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.05.2000; Gordon and Breach
• Subjects: chiral magnet; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; high spin molecule; Magnetic properties and materials; Molecular magnets; molecule-based magnet; Physics; Studies of specific magnetic materials; triplet chiral organic radical; Ferrimagnetic materials; Molecular magnetism; Space groups; Molecular structure; Molecular magnet; Manganese complexes; Organic ligand; Orthorhombic lattices; Chiral symmetry; XRD; Experimental study; Crystal structure
• ISSN: 1058-725X
• DOI: 10.1080/10587250008023509

A novel chiral organic radical 2-{4′-((S)-2″-methylbutoxy)phcnyl}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (1) and its metal complex, [1·Mn(II)(hfac) 2 ] n were synthesized and characterized. The radical 1 crystallizes in the orthorhombic space group P2 1 2 1 2 1 (No. 19) with a = 11.494(3) Å, b = 25.328(3) Å, c = 6.1281(5) Å, V = 1748.0(4) Å 3 . The complex [1·Mn(II)(hfac) 2 ] n crystallizes in the same space group with a = 14.081(1) Å, b = 15.940(1) Å, c = 16.075(1) Å, V = 3608.1(4) Å 3 . X-ray crystal structure analysis of the complex revealed the formation of a helical-chain structure. The oxygen atoms of the radical 1 are ligated to two different manganese ions in cis position and exhibit the δ configuration in [1·Mn(II)(hfac) 2 ] n . The magnetic measurements revealed that this chiral complex behaves as a ferrimagnet below T C = 4.5 K. It is characterized by a strong intrachain exchange correlation, the ratio between the intrachain and interchain exchange interactions being about 10 −5 .