zero field splitting parameter
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2021 ◽  
Vol 50 (10) ◽  
pp. 3468-3472
Author(s):  
Roman Boča ◽  
Ján Titiš ◽  
Cyril Rajnák ◽  
J. Krzystek

Magnetochemical standard HgCo(NCS)4 with positive zero-field splitting parameter D displays a slow magnetic relaxation strongly dependent upon the external magnetic field.


2019 ◽  
Vol 48 (41) ◽  
pp. 15419-15426 ◽  
Author(s):  
Tao Wu ◽  
Yuan-Qi Zhai ◽  
Yi-Fei Deng ◽  
Wei-Peng Chen ◽  
Tao Zhang ◽  
...  

The distortion degree from the ideal tetrahedral geometry has been correlated with the zero-field splitting parameter in a series of mononuclear cobalt(ii)-sulfonamide complexes with a CoN4 coordination environment.


2018 ◽  
Vol 122 (27) ◽  
pp. 6880-6887 ◽  
Author(s):  
Tsubasa Okamoto ◽  
Eiji Ohmichi ◽  
Yu Saito ◽  
Takahiro Sakurai ◽  
Hitoshi Ohta

2018 ◽  
Vol 11 (1) ◽  
pp. 26-30
Author(s):  
Veronika Chrenková ◽  
Dušan Valigura

Abstract Pincer type ligand 2,6-pyridinedimethanol was used as a useful tool in the preparation of the Co(II) pseudoctahedral complex together with 3,5-dinitrobenzoate counteranion. New complex of the composition [Co(pydm)2](3,5-dnbz)2(pydm = 2,6-pyridinedimethanol, and 3,5-dnbz = 3,5-dinitrobenzoate anion) has been prepared and characterized. Its XRD structure revealed pseudooctahedral {CoN2O4} chromophore around the cobalt atom with Co-N distances significantly shorter (Co-Nav = 2.038 Ǻ) in comparison to the Co-O ones (Co-Oav = 2.142 Ǻ), which was probably the reason of its relatively high zero-field splitting parameter (D/hc = 43.6 cm-1). Positive value of the D parameter causes slow relaxation process typical for Co(II) SMM behavior. The 3,5-dinitrobenzoate counteranions are strongly bonded to the [Co(pydm)2] cation via rather strong hydrogen bonds (O∙∙∙Oav = 2.568 Ǻ) forming “quasi molecular” units. Solid state structure allowed different π-π stacking interactions of neighboring “molecular” unit aromatic rings probally leading to observation of the additional relaxation mode.


2018 ◽  
Vol 20 (15) ◽  
pp. 10470-10492 ◽  
Author(s):  
Jessica A. Clayton ◽  
Katharina Keller ◽  
Mian Qi ◽  
Julia Wegner ◽  
Vanessa Koch ◽  
...  

The Zero-Field Splitting (ZFS) distributions in Gd(iii) centers are accurately analyzed, with detailed discussion of error bars, and compared to the calculations with superposition model.


Author(s):  
Rajeev Ranjan ◽  
Navneet Sinha ◽  
Sahdeo Kumar ◽  
Chandra Mauleshwar Chandra ◽  
Shivadhar Sharma

<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>


2017 ◽  
Vol 4 (11) ◽  
pp. 1909-1916 ◽  
Author(s):  
Zhong-Yu Ding ◽  
Yin-Shan Meng ◽  
Yi Xiao ◽  
Yi-Quan Zhang ◽  
Yuan-Yuan Zhu ◽  
...  

A series of field-induced cobalt(ii) SIMs exhibit varying axial zero-field splitting parameter D values from positive to negative with the increased distortion of the octahedral geometry.


2016 ◽  
Vol 15 (2) ◽  
pp. 200-211 ◽  
Author(s):  
Dominik Lomjanský ◽  
Filip Varga ◽  
Cyril Rajnák ◽  
Ján Moncoľ ◽  
Roman Boča ◽  
...  

AbstractA mononuclear CoII complex, [Co(qu)2Br2], and NiII complex, [Ni(PPh3)2Cl2], (qu = quinoline, PPh3 = triphenylphosphine) have been reinvestigated. Their crystal and molecular structures are reported along with IR and UV-Vis spectra. Magnetism of both complexes has been studied by using the DC SQUID magnetometry. These complexes exhibit a moderate magnetic anisotropy expressed by zero-field splitting parameter D. The D-value is positive for both complexes with D/hc = +5.94 cm−1 and D/hc = +12.76 cm−1, that is also confirmed by ab initio calculations.


2016 ◽  
Vol 52 (4) ◽  
pp. 753-756 ◽  
Author(s):  
Mamon Dey ◽  
Snigdha Dutta ◽  
Bipul Sarma ◽  
Ramesh Ch. Deka ◽  
Nayanmoni Gogoi

Subtle modulation of the coordination environment in seven coordinate Co(ii) complexes leads to a remarkable deviation in the axial zero field splitting parameter (D) in a predictable fashion.


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