Year-end Sale % OFF 
Abstract
New magnetic metal complexes with organic radical ligands, [M(hfac)2(PyBTM)2] (M = NiII, CoII; hfac = hexafluoroacetylacetonato, PyBTM = (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical), were prepared and their crystal structures, magnetic properties, and electronic structures were investigated. Metal ions in [M(hfac)2(PyBTM)2] constructed distorted octahedral coordination geometry, where the two PyBTM molecules ligated in the trans configuration. Magnetic investigation using a SQUID magnetometer revealed that χT increased with decreasing temperature from 300 K in the two complexes, indicating an efficient intramolecular ferromagnetic exchange interaction taking place between the spins on PyBTM and M with J/kB of 21.8 K and 11.8 K for [NiII(hfac)2(PyBTM)2] and [CoII(hfac)2(PyBTM)2]. The intramolecular ferromagnetic couplings in the two complexes could be explained by density functional theory calculations, and would be attributed to a nearly orthogonal relationship between the spin orbitals on PyBTM and the metal ions. These results demonstrate that pyridyl-containing triarylmethyl radicals are key building blocks for magnetic molecular materials with controllable/predictable magnetic interactions.
Highlights
Molecular materials with magnetic functions have been focused on as promising components for future molecule-based devices
Among the molecule-based magnetic materials developed to date, the coupling of magnetic metal ions and open-shell organic radical ligands has resulted in a variety of unprecedented materials such as a one-dimensional chain magnet with slow magnetic relaxation, light-responsive breathing crystals, and high-temperature molecular magnets [1,2,3]
The unit cell contains two crystallographically non-equivalent [CoII(hfac)2(PyBTM)2] molecules, and one of them is shown in Figure ATf2ionwavrv.emoeTrraPshsgyeiaeoBCddnTioMsMcItIeo–inorrOtatnee1drdf,i.ocMoTarcmwl–stOasolhi2ageP,addaytrniBesadTtltooMcMrotthe–ordNeraddCobiincocotaaInaItlhdisiooellndniegrngvaageitlatoechmtotshooeferottrdnhryiie,tntharaCoentgoidtoweIIninsoiogalnnoetooocvnammit-aeesedqttirhnuoyeina,vanatanrilnetadrnniontisgsvccelooenomrncsafiaipottgloeneumdxrceaosestnniianotaernenra.. 2tr.0an48s Åco,n2f.i0g4u7rÅat,ioann.dA2v.1e4r0agÅedfoMr M–O=1,CMoII–aOn2d, a2n.0d28MÅ,N2.0b4o0nÅd,laenndgt2h.s07f8orÅthfoertMwo= nNoinII
Summary
Molecular materials with magnetic functions have been focused on as promising components for future molecule-based devices. Among the molecule-based magnetic materials developed to date, the coupling of magnetic metal ions and open-shell organic radical ligands has resulted in a variety of unprecedented materials such as a one-dimensional chain magnet with slow magnetic relaxation, light-responsive breathing crystals, and high-temperature molecular magnets [1,2,3]. In these materials, precise control of magnetic interactions between the radical and metals is the crucial factor for achieving desired functions.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
