Modulation of the coordination environment: a convenient approach to tailor magnetic anisotropy in seven coordinate Co(ii) complexes

2016 ◽  
Vol 52 (4) ◽  
pp. 753-756 ◽  
Author(s):  
Mamon Dey ◽  
Snigdha Dutta ◽  
Bipul Sarma ◽  
Ramesh Ch. Deka ◽  
Nayanmoni Gogoi
Keyword(s):  
Magnetic Anisotropy ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Coordination Environment ◽  
Zero Field Splitting Parameter ◽  
Convenient Approach ◽  
Splitting Parameter ◽  
Remarkable Deviation

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.

Correlating magnetic anisotropy with the subtle coordination geometry variation of a series of cobalt(ii)-sulfonamide complexes

2019 ◽  
Vol 48 (41) ◽  
pp. 15419-15426 ◽  
Author(s):  
Tao Wu ◽  
Yuan-Qi Zhai ◽  
Yi-Fei Deng ◽  
Wei-Peng Chen ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Zero Field ◽  
Coordination Geometry ◽  
Zero Field Splitting ◽  
Tetrahedral Geometry ◽  
Coordination Environment ◽  
Zero Field Splitting Parameter ◽  
Mononuclear Cobalt ◽  
Splitting Parameter ◽  
The Ideal

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.

scholarly journals Redetermination of Zero-Field Splitting in [Co(qu)2Br2] and [Ni(PPh3)2Cl2] Complexes

2016 ◽  
Vol 15 (2) ◽  
pp. 200-211 ◽  
Author(s):  
Dominik Lomjanský ◽  
Filip Varga ◽  
Cyril Rajnák ◽  
Ján Moncoľ ◽  
Roman Boča ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Molecular Structures ◽  
Zero Field ◽  
Squid Magnetometry ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Crystal And Molecular Structures ◽  
Zero Field Splitting Parameter ◽  
Splitting Parameter

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.

Probing the influence of molecular symmetry on the magnetic anisotropy of octahedral cobalt(ii) complexes

2017 ◽  
Vol 4 (11) ◽  
pp. 1909-1916 ◽  
Author(s):  
Zhong-Yu Ding ◽  
Yin-Shan Meng ◽  
Yi Xiao ◽  
Yi-Quan Zhang ◽  
Yuan-Yuan Zhu ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Octahedral Geometry ◽  
Zero Field ◽  
Molecular Symmetry ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Zero Field Splitting Parameter ◽  
Splitting Parameter

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.

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>

SUPERPOSITION MODEL ANALYSIS FOR THE ZERO-FIELD SPLITTING OFMn2+IN SOME CRYSTALS

2006 ◽  
Vol 20 (30) ◽  
pp. 1917-1922 ◽  
Author(s):  
VIMAL KUMAR JAIN
Keyword(s):  
Lattice Relaxation ◽  
Zero Field ◽  
Superposition Model ◽  
Zero Field Splitting ◽  
Intrinsic Parameter ◽  
Order Zero ◽  
Field Splitting ◽  
Zero Field Splitting Parameter ◽  
Local Lattice ◽  
Splitting Parameter

The Newman superposition model has been applied to second-order zero-field splitting parameter [Formula: see text] taken from the literature for Mn2+in Hg(ClO4)2· 6 H2O , M ″ SiF6·6 H2O (M ″= Fe, Co, Zn ) and M ″ NbOF5·6 H2O (M ″= Co, Zn ). In the calculations, the local lattice relaxation has been taken into account. It is shown that nearly the same value of intrinsic parameter b2=-0.057(8) cm-1is obtained.

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