کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1401443 | 1501710 | 2016 | 8 صفحه PDF | دانلود رایگان |
• Four novel tri-spin nitronyl nitroxide radical-Ln(III) complexes were synthesized.
• The mononuclear structures were determined by single-crystal X-ray diffraction.
• The magnetic properties of four complexes have been studied.
• The thermodynamics properties have been studied.
Four new nitronyl nitroxide radical-Ln(III) complexes, Ln(hfac)3(NITPhSCF3)2 (Ln(III) = Sm(1), Gd(2), Tb(3), Dy(4); NITPhSCF3 = 2-(4-trifluoromethylthiophenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl- 3-oxide; hfac = hexafluoroacetylacetonate), have been synthesized and characterized. They are isostructural, which show mononuclear tri-spin structures. The central Ln(III) ion is eight-coordinated by three hfac anions and two NITPhSCF3 molecules. Direct-current magnetic study shows that there exist ferromagnetic interactions between Gd(III) ion and radicals (NITPhSCF3) with JGd-Rad = 1.61 cm−1, and antiferromagnetic interactions between radicals with JRad-Rad = −2.83 cm−1 in complex 2. The magnetic analysis with the rough approximate model show that a ferromagnetic coupling exists between Tb(III) and radical in 3, while a antiferromagnetic coupling between Dy(III) and radical in 4. The thermodynamics properties of four complexes were studied with differential scanning calorimetry (DSC), such as heat capacity, thermodynamic functions (HT-H298.15K), (ST-S298.15K), and (GT-G298.15K).
Four new nitronyl nitroxide radical-Ln(III) complexes have been synthesized and characterized. They are isostructural, which show mononuclear tri-spin structures. The magnetic properties and thermodynamics properties are studied.Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Structure - Volume 1107, 5 March 2016, Pages 174–181