High-Frequency EPR Spectroscopy of Large Metal Ion Clusters: From Zero Field Splitting to Quantum Tunneling of the Magnetization

1998 ◽  
Vol 31 (8) ◽  
pp. 460-466 ◽  
Author(s):  
Anne-Laure Barra ◽  
Louis-Claude Brunel ◽  
Dante Gatteschi ◽  
Luca Pardi ◽  
Roberta Sessoli
Keyword(s):  
Epr Spectroscopy ◽  
High Frequency ◽  
Quantum Tunneling ◽  
Metal Ion ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Ion Clusters

scholarly journals Abnormal Magnetic Moment and Zero Field Splitting of Some Nickel (II) Complexes

2017 ◽  
Vol 7 (1) ◽  
pp. 34
Author(s):  
Rajeev Ranjan ◽  
Navneet Sinha ◽  
Sahdeo Kumar ◽  
Chandra Mauleshwar Chandra ◽  
Shivadhar Sharma
Keyword(s):  
Magnetic Moment ◽  
Metal Ion ◽  
Free Ligand ◽  
Tetragonal Distortion ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Absorption Bands ◽  
Field Splitting ◽  
Zero Field Splitting Parameter ◽  
Splitting Parameter

<em>Some complexes of Ni(II) have been prepared with 2-thio-3-acetyl hydantoin (TAHN) and 2-formyl pyridine thiosemicarbazone (FPTS). On the basis of elemental analysis and molar conductivity, the complexes have been formulated as NiL<sub>2</sub>X<sub>2</sub>, where L = TAHN or FPTS and X = Cl<sup>–</sup>, Br<sup>–</sup>, NCS<sup>–</sup>, ClO<sub>4</sub><sup>–</sup>. The infrared spectra of complexes and free ligand reveal that the ligand TAHN is co-ordinated through sulphur and acetyl oxygen, while FPTS ligand co-ordinates through heterocyclic nitrogen and sulphur to Ni(II) metal ion. The magnetic moment of these complexes are found to be 3.20-3.25 B.M. The values are greater than value (2.828 B.M) corresponding to two unpaired electrons of a d<sup>8</sup>-system. The appearance of four absorption bands in their electronic spectra reveal, the tetragonal distortion in the octahedral symmetry of complexes. The zero field splitting parameter(D) and the other crystal field parameters like Dq<sub>(xy)</sub>, Dq<sub>(z)</sub>, Dt have been calculated. The results show that, the tetragonal distortion parameter (Dt) increases in the order of NCS<sup>– </sup>&lt; Cl<sup>–</sup> &lt; Br<sup>–</sup> while the zero field splitting parameter (D) also increases in the same order for both the planer ligands.</em>

Zero-Field Splitting in Pseudotetrahedral Co(II) Complexes: a Magnetic, High-Frequency and -Field EPR, and Computational Study

2013 ◽  
Vol 52 (16) ◽  
pp. 9409-9417 ◽  
Author(s):  
Monika Idešicová ◽  
Ján Titiš ◽  
J. Krzystek ◽  
Roman Boča
Keyword(s):  
High Frequency ◽  
Computational Study ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

Magnetic and high-frequency EPR studies of an octahedral Fe(iii) compound with unusual zero-field splitting parameters

2009 ◽  
pp. 1668 ◽  
Author(s):  
Alejandro Solano-Peralta ◽  
Juan P. Saucedo-Vázquez ◽  
Roberto Escudero ◽  
Herbert Höpfl ◽  
Hassane El-Mkami ◽  
...  
Keyword(s):  
High Frequency ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting

Investigation of the Zero-Field Splitting of d8 Ions in Pseudo-tetragonal Ni(II) Compounds

1994 ◽  
Vol 49 (11) ◽  
pp. 1013-1015 ◽  
Author(s):  
Jia-Jun Chen ◽  
Mao-Lu Du ◽  
Zhao-Ming Li
Keyword(s):  
Metal Ion ◽  
Tetragonal Symmetry ◽  
Zero Field ◽  
Central Metal ◽  
Spin Orbit Coupling ◽  
Cluster Approach ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Central Transition ◽  
Ion Yields

Abstract This paper presents a cluster approach to the zero-field splitting (ZFS) of the ground state 3A2(F) of d8 ions with tetragonal symmetry, in which not only the spin-orbit coupling of the central transition-metal-ion but also that of ligands contributes. For some pseudo-tetragonal Ni(II) com­ pounds the calculated values of the ZFS parameter follow the order Cl-> Br-> I-. This agrees with the experimental finding, while the pure crystal field approach considering only the coupling of central metal ion yields the opposite trend.

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