کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9776272 | 1509483 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetism of novel organic heterospin composite systems in supramolecular complexes of nitronyl nitroxide
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
بیومتریال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The authors have shown from theoretical calculations that a one-dimensional molecular assemblage composed of ground-state singlet biradicals and SÂ =Â 1/2 monoradicals has three kinds of ground states; two with seemingly ferrimagnetic spin alignments and one with a spinless (diamagnetic) state. The energy preference of the three states depends on the relative ratios of the intra- and intermolecular magnetic interactions. This gives a quantum switching device, in which a conversion of the spin state is controlled by external perturbation such as pressure and magnetic field. As a model system for the magnetic switching device, we have designed and synthesized organic coordination compound of an anionic biradical (1â) with a singlet (SÂ =Â 0) ground state and a Na+-15-crown-5-ether derivative of nitronylnitroxide monoradical (2), 2,5-Bis(1 -oxyl-3-oxido-dihydroxy-4,4,5,5-tetramethyl imidazolin-2-yl)phenol-Sodium(4-(1 -oxyl-3-oxido-dihydroxy-4,4,5,5-tetramethyl imidazolin-2-yl)-15-crown-5) Salt, [Na2]+1â. Possible occurrence of the exotic ferrimagnetic spin alignment in the complex salt [Na2]+1â is discussed from magnetic susceptibility measurements. A novel 18-crown-6-ether substituted nitronyl nitroxide monoradical 3 has also been synthesized as a building block for organic ferrimagnet. The intermolecular interaction of 3 was found to be antiferromagnetic from magnetic susceptibility measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 154, Issues 1â3, 22 September 2005, Pages 293-296
Journal: Synthetic Metals - Volume 154, Issues 1â3, 22 September 2005, Pages 293-296
نویسندگان
Y. Kanzaki, T. Ise, D. Shiomi, K. Sato, T. Takui,