Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations
A new lanthanide citrate motif of general formula [Ln(Hcit)(H 2O)2·H2O]n, where Ln = Gd (1) and Nd (2) and Hcit3-= C(OH)(COO-)(CH2COO -)2, has been synthesized hydrothermally from Ln 2O3 and citric acid at 100°C and characterized by elemental analysis, IR, TG-DTA, single-crystal X-ray diffraction, a...
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paper:paper_00201669_v44_n24_p8979_Baggio2023-06-08T14:40:33Z Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations Perec, Mireille cation citric acid gadolinium neodymium article chemical structure chemistry electron spin resonance inorganic chemistry magnetism methodology X ray crystallography Cations Chemistry, Inorganic Citrates Crystallography, X-Ray Electron Spin Resonance Spectroscopy Gadolinium Magnetics Models, Molecular Molecular Structure Neodymium A new lanthanide citrate motif of general formula [Ln(Hcit)(H 2O)2·H2O]n, where Ln = Gd (1) and Nd (2) and Hcit3-= C(OH)(COO-)(CH2COO -)2, has been synthesized hydrothermally from Ln 2O3 and citric acid at 100°C and characterized by elemental analysis, IR, TG-DTA, single-crystal X-ray diffraction, and magnetic measurements. The structures can be seen as "ladder chains" along the a axis, with dinuclear Ln2O2 units serving as "steps" and R-COO groups as "uprights", which are connected by H bonds. The magnetic susceptibility between 2 and 300 K and the magnetization at 2 K, as a function of magnetic field between 0 and 5 T, were measured for both compounds. By modeling the magnetic behavior of the Gd compound with a dinuclear Hamiltonian script KS = gμB(SA + SB)Bo - J oSASB (SA = SB = 7/2), a ferromagnetic exchange interaction Jo = 0.039 cm-1 was evaluated between Gd ions situated at do = 4.321 Å in dinuclear units bridged by two symmetry-related tridentate carboxylate oxygens. The EPR spectrum of the Gd compound is discussed. The temperature dependence of the susceptibility of the Nd compound is caused by the depopulation of the excited crystal-field levels when the temperature decreases. The magnetic-field dependence of the magnetization of 2 is attributed to the ground-state Kramers' doublet populated at 2 K. The g factor of this ground-state doublet is calculated from the data and compared with values for other compounds reported in the literature. © 2005 American Chemical Society. Fil:Perec, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v44_n24_p8979_Baggio http://hdl.handle.net/20.500.12110/paper_00201669_v44_n24_p8979_Baggio |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
cation citric acid gadolinium neodymium article chemical structure chemistry electron spin resonance inorganic chemistry magnetism methodology X ray crystallography Cations Chemistry, Inorganic Citrates Crystallography, X-Ray Electron Spin Resonance Spectroscopy Gadolinium Magnetics Models, Molecular Molecular Structure Neodymium |
| spellingShingle |
cation citric acid gadolinium neodymium article chemical structure chemistry electron spin resonance inorganic chemistry magnetism methodology X ray crystallography Cations Chemistry, Inorganic Citrates Crystallography, X-Ray Electron Spin Resonance Spectroscopy Gadolinium Magnetics Models, Molecular Molecular Structure Neodymium Perec, Mireille Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| topic_facet |
cation citric acid gadolinium neodymium article chemical structure chemistry electron spin resonance inorganic chemistry magnetism methodology X ray crystallography Cations Chemistry, Inorganic Citrates Crystallography, X-Ray Electron Spin Resonance Spectroscopy Gadolinium Magnetics Models, Molecular Molecular Structure Neodymium |
| description |
A new lanthanide citrate motif of general formula [Ln(Hcit)(H 2O)2·H2O]n, where Ln = Gd (1) and Nd (2) and Hcit3-= C(OH)(COO-)(CH2COO -)2, has been synthesized hydrothermally from Ln 2O3 and citric acid at 100°C and characterized by elemental analysis, IR, TG-DTA, single-crystal X-ray diffraction, and magnetic measurements. The structures can be seen as "ladder chains" along the a axis, with dinuclear Ln2O2 units serving as "steps" and R-COO groups as "uprights", which are connected by H bonds. The magnetic susceptibility between 2 and 300 K and the magnetization at 2 K, as a function of magnetic field between 0 and 5 T, were measured for both compounds. By modeling the magnetic behavior of the Gd compound with a dinuclear Hamiltonian script KS = gμB(SA + SB)Bo - J oSASB (SA = SB = 7/2), a ferromagnetic exchange interaction Jo = 0.039 cm-1 was evaluated between Gd ions situated at do = 4.321 Å in dinuclear units bridged by two symmetry-related tridentate carboxylate oxygens. The EPR spectrum of the Gd compound is discussed. The temperature dependence of the susceptibility of the Nd compound is caused by the depopulation of the excited crystal-field levels when the temperature decreases. The magnetic-field dependence of the magnetization of 2 is attributed to the ground-state Kramers' doublet populated at 2 K. The g factor of this ground-state doublet is calculated from the data and compared with values for other compounds reported in the literature. © 2005 American Chemical Society. |
| author |
Perec, Mireille |
| author_facet |
Perec, Mireille |
| author_sort |
Perec, Mireille |
| title |
Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| title_short |
Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| title_full |
Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| title_fullStr |
Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| title_full_unstemmed |
Gadolinium and neodymium citrates: Evidence for weak ferromagnetic exchange between gadolinium(III) cations |
| title_sort |
gadolinium and neodymium citrates: evidence for weak ferromagnetic exchange between gadolinium(iii) cations |
| publishDate |
2005 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v44_n24_p8979_Baggio http://hdl.handle.net/20.500.12110/paper_00201669_v44_n24_p8979_Baggio |
| work_keys_str_mv |
AT perecmireille gadoliniumandneodymiumcitratesevidenceforweakferromagneticexchangebetweengadoliniumiiications |
| _version_ |
1768544761525829632 |