New Radicals-3d or 4f metal complexes and single-molecule magnet design, synthesis

Title: New Radicals-3d or 4f metal complexes and single-molecule magnet design, synthesis and properties ofAuthor: Zhou NaDegree-granting units: Nankai UniversityKeywords: single-molecule magnets;; nitroxides;; rare earth metals;; transition metal;; magneticSummary:

Single-molecule magnets (SMMs) and single-chain magnets (SCMs) of synthetic chemistry and molecular-based materials chemistry, solid state physics have Magnetic lifter attracted great interest, since D. Gatteschi's group reported the first case based on a single nitroxides chain magnet, the nitroxide-based single-molecule magnets and single-chain magnets synthesis also received extensive attention. This paper around NITPhOEt and NITPhOCH2Ph ​​two non-functional nitroxides, design and synthesis of 24 have not been reported to 2p-4f and four 2p-3d complexes. Their crystal structure analysis, and application of elemental analysis, IR, electronic spectra, ESR spectra, variable temperature magnetic susceptibility by means of complexes were characterized and the nature of research.

Which complexes [Tb (hfac) 3 (NITPhOEt) 2] (1) with single-molecule magnet behavior, is the first based on nitroxides and three rare earth ions in single-spin single-molecule magnet metal. Synthesized in this paper two Radical-Gd (III)-Radical ferromagnetic complexes, in order to more accurately handle these three spin interactions with a variety of magnetic structure relationship, we introduce homogeneous Radical-Lu (III) -Radical complexes, thus more accurately determine the interaction between free radicals and Gd (Ⅲ) and the interaction between free radicals and with a similar structure has been reported Radical-Gd (III) complexes of the magnetic data for comparison. In these 28 complexes, the complexes [Ce (hfac) 3 (NITPhOEt)] n (3) and [Pr (hfac) 3 (NITPhOEt)] n (4) one-dimensional chain structure, complex [( Cu (hfac) 2) 3 (NITPhOEt) 2] (25) for the three nuclear spin structure of five other complexes are Radical-Ln (III)-Radical zero-dimensional structure of the complexes. Of complexes containing magnetic rare earth ions, they need to consider the crystal field effect, spin - orbit coupling, but also consider the paramagnetic ion magnetic interactions between, in particular, this paper reports the 2p-4f complexes, containing both rare earth paramagnetic metal ions in the nitrogen-oxygen free radicals, similar theoretical model we use O'connor these complexes to fit the variable temperature magnetic susceptibility, most of the complexes have been more reasonable results.

Also, to explore the different types of free radicals affect the structure of complexes, this paper uses NITPyOMe nitroxides synthesized three http://www.999magnet.com/products/131-magnetic-lifter different structures of the 2p-3d complexes. Test their variable-temperature magnetic susceptibility, and magnetic structure of their relationship.

Reported in this paper extends the single-molecule magnets based on nitroxides single molecule magnet field of study, O'connor approximate theoretical model successfully used in this paper, once again confirmed the theoretical model in dealing with the rare-earth crystal field effect the applicability of ion complexes, thus promoting the development of rare earth magnetic materials.Degree Year: 2010