التفاصيل البيبلوغرافية
| العنوان: |
Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O |
| المؤلفون: |
Gerard, Matias Fernando, Aiassa, C., Casado, Nieves Maria Claudia, Santana, R. C., Perec, Mireille, Rapp, R. E., Calvo, Rafael |
| بيانات النشر: |
Elsevier |
| المجموعة: |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
| مصطلحات موضوعية: |
Magnetic Properties, Electron Paramagnetic Resonance, https://purl.org/becyt/ford/1.3, https://purl.org/becyt/ford/1 |
| الوصف: |
Magnetic and EPR data have been collected for complex [Cu(L-Arg)2](NO3)2-3H2O (Arg ¼ arginine). Magnetic susceptibility w in the temperature range 2–160 K, and a magnetization isotherm at T ¼ 2.29(1)K with magnetic fields between 0 and 9 T were measured. The observed variation of wT with T indicates predominant antiferromagnetic interactions between Cu(II) ions coupled in 1D chains along the b axis. Fitting a molecular field model to the susceptibility data allows to evaluate g ¼ 2.10(1) for the average g-factor and J ¼ -0.42(6) cm-1 for the nearest neighbor exchange coupling (defined as Hex ¼ -PJijSi- Sj). This coupling is assigned to syn–anti equatorial–apical carboxylate bridges connecting Cu(II) ion neighbors at 5.682A ° , with a total bond length of 6.989A ° and is consistent with the magnetization isotherm results. It is discussed and compared with couplings observed in other compounds with similar exchange bridges. EPR spectra at 9.77 were obtained in powder samples and at 9.77 and at 34.1GHz in the three orthogonal planes of single crystals. At both microwave frequencies, and for all magnetic field orientations a single signal arising from the collapse due to exchange interaction of resonances corresponding to two rotated Cu(II) sites is observed. From the EPR results the molecular g-tensors corresponding to the two copper sites in the unit cell were evaluated, allowing an estimated lower limit |J |40.1 cm-1 for the exchange interaction between Cu(II) neighbors, consistent with the magnetic measurements. ; Fil: Gerard, Matias Fernando. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina ; Fil: Aiassa, C. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| تدمد: |
0022-3697 |
| Relation: |
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0022369707001564; http://hdl.handle.net/11336/22819; Gerard, Matias Fernando; Aiassa, C.; Casado, Nieves Maria Claudia; Santana, R. C.; Perec, Mireille; et al.; Magnetic properties and EPR spectra of [Cu(L-arginine)2](NO3)2.3H2O; Elsevier; Journal of Physics and Chemistry of Solids; 68; 8; 6-2007; 1533-1539; CONICET Digital; CONICET |
| الاتاحة: |
http://hdl.handle.net/11336/22819 |
| Rights: |
info:eu-repo/semantics/openAccess ; https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
| رقم الانضمام: |
edsbas.75F1B19A |
| قاعدة البيانات: |
BASE |