2D double-layered metal–radical complexes: Crystal structures and magnetic properties

• Published in: Synthetic metals 2010-05, Vol.160 (9), p.839-844
• Main Authors: Guo, Le, Zhang, Xuhong, Wang, Shuping, Yang, Shutao, Wang, Yuxiao, Song, You
• Format: Article
• Language: English
• Subjects: 2D double-layered structure; Anions; Chains; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Ferromagnetism; Hydrogen bonds; Inorganic compounds; Magnetic properties; Magnetic properties and materials; Magnetic property; Metal complexes; Molecular magnets; Networks; Nitronyl nitroxide radical; Physics; Pyridine-2,4-dicarboxylate; Stands; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Studies of specific magnetic materials; Supports; Two dimensional
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2010.01.029

Two new complexes [Mn(NIT4Py)(2,4-PDA)(H 2O) 2] ( 1) and [Co(NIT4Py)(2,4-PDA)(H 2O) 2] ( 2) (where NIT4Py stands for 2-(4′-pyridinyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, 2,4-PDA stands for pyridine-2,4-dicarboxylate) have been synthesized and characterized. The single-crystal X-ray diffraction demonstrates that complex 1 present dimeric structure with two 2,4-PDA anions function as bridging ligands, connecting two Mn(II) centers. The dimeric units form an infinite 2D double-layered network via hydrogen bonds. Complex 2 consists of infinite 1D chain, in which each 2,4-PDA anion bridges two adjacent Co(II) ions in monodentate–bidentate mode. These 1D chains are further connected together by hydrogen bonds, generating a 2D double-layered structure, too. The variable temperature magnetic susceptibility measurements reveal that the magnetic couplings between Mn(II) and NIT4Py, Co(II) and NIT4Py are weak ferromagnetic and antiferromagnetic interactions for complexes 1 and 2, respectively.