Hepta-coordinated Ni(ii) assemblies – structure and magnetic studies

2021 ◽  
Vol 50 (15) ◽  
pp. 5251-5261
Author(s):  
Mateusz Reczyński ◽  
Mitsuru Akaki ◽  
Takamitsu Fukuda ◽  
Yuya Sawada ◽  
Kengo Nishii ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Pentagonal Bipyramid ◽  
Coordination Geometry ◽  
Magnetic Studies

HF-EPR and magnetometric studies show high magnetic anisotropy of Ni(ii) ions imposed by pentagonal bipyramid coordination geometry.

Probing the Effects of Ligand Field and Coordination Geometry on Magnetic Anisotropy of Pentacoordinate Cobalt(II) Single-Ion Magnets

2017 ◽  
Vol 56 (12) ◽  
pp. 6870-6878 ◽  
Author(s):  
Amit Kumar Mondal ◽  
Tamal Goswami ◽  
Anirban Misra ◽  
Sanjit Konar
Keyword(s):  
Magnetic Anisotropy ◽  
Ligand Field ◽  
Coordination Geometry

scholarly journals Magnetic anisotropy of a CoII single ion magnet with distorted trigonal prismatic coordination: theory and experiment

2016 ◽  
Vol 18 (43) ◽  
pp. 30135-30143 ◽  
Author(s):  
Yan Peng ◽  
Tilmann Bodenstein ◽  
Karin Fink ◽  
Valeriu Mereacre ◽  
Christopher E. Anson ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Quantum Chemical ◽  
Coordination Geometry ◽  
Coordination Theory ◽  
Trigonal Prismatic Coordination ◽  
Trigonal Prismatic ◽  
Theory And Experiment

The single-ion magnetic properties of a trigonal-prismatic Co(ii) complex (left) are explored experimentally as well as analysed with respect to the coordination geometry by quantum chemical ab initio methods.

Synthesis and magnetic studies of pentagonal bipyramidal metal complexes of Fe, Co and Ni

2019 ◽  
Vol 48 (10) ◽  
pp. 3243-3248 ◽  
Author(s):  
Yi-Fei Deng ◽  
Binling Yao ◽  
Peng-Zhi Zhan ◽  
Dexuan Gan ◽  
Yuan-Zhu Zhang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Metal Complexes ◽  
Easy Plane ◽  
Magnetic Studies ◽  
Model Complexes

Three mononuclear model complexes with pentagonal bipyramidal geometry, [MII(L-N3O2)(MeCN)2][BPh4]2 (M = Fe, 1; Co, 2; Ni, 3) were isolated and found to exhibit large uniaxial (1 and 3) and easy-plane (2) magnetic anisotropy, respectively.

Carboxylate-Bridged Dinuclear Dy2 Single-Molecule Magnets: Synthesis, Structure, and Magnetic Studies

2013 ◽  
Vol 66 (1) ◽  
pp. 98 ◽  
Author(s):  
Yu-mei Song ◽  
Feng Luo ◽  
Yan Zhu ◽  
Xiao-zhao Tian ◽  
Gong-ming Sun
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Coordination Geometry ◽  
Magnetic Studies ◽  
Single Molecule Magnets ◽  
Chlorobenzoic Acid ◽  
Ferromagnetic Interaction ◽  
Single Molecule Magnet ◽  
The Difference

In this work, the synthesis, structure, and magnetic studies of three dinuclear Dy2 compounds, namely Dy2(bpy)2(L)6 (1), Dy2(phen)2(L)6 (2), Dy2(μ-H2O)2(bpy)2(L)6 (3) are reported in detail, where HL, phen, and bpy are 4-chlorobenzoic acid, 1,10-phenanthroline, and 2,2′-bipyridine. Magnetic studies reveal the intramolecular ferromagnetic interaction and single-molecule magnetic properties of these compounds. The fine-tuned single-molecule magnet properties of compounds 1–3, mainly due to the difference of the coordination geometry of DyIII ions, are highlighted.

High local coordination symmetry around the spin center and the alignment between magnetic and symmetric axes together play a crucial role in single-molecule magnet performance

2019 ◽  
Vol 48 (15) ◽  
pp. 4931-4940 ◽  
Author(s):  
Zhao-Fu Yang ◽  
Yong-Mei Tian ◽  
Wan-Ying Zhang ◽  
Peng Chen ◽  
Hong-Feng Li ◽  
...  
Keyword(s):  
Single Molecule ◽  
Crucial Role ◽  
Pentagonal Bipyramid ◽  
Coordination Geometry ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Local Coordination ◽  
Spin Center

A tetradentate 8-hydroxyquinoline-based acyl hydrazine ligand was used to construct a series of mono/di-nuclear dysprosium single-molecule magnets (SMMs) with nearly ideal pentagonal bipyramid coordination geometry (D5h).

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.

Two New One-Dimensional Homospin Dy(III) Compounds Showing Slow Magnetic Relaxation

2012 ◽  
Vol 65 (10) ◽  
pp. 1436 ◽  
Author(s):  
Feng Luo ◽  
Yu-Mei Song ◽  
Hai-Xiao Huang ◽  
Xiao-Zhao Tian ◽  
Gong-Ming Sun ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Chain Structure ◽  
Helical Chain ◽  
Pentagonal Bipyramid ◽  
Magnetic Studies ◽  
Coordination Polyhedra ◽  
One Dimensional ◽  
Nitrobenzoic Acid ◽  
Slow Magnetic Relaxation ◽  
Ferromagnetic Interactions

In this work, we present two new one-dimensional Dy(iii) compounds, namely [Dy3(L1)9]n (1, HL1 = benzoic acid) and {[Dy4(L2)14][Fe(phen)3]}n (2, HL2 = 3-nitrobenzoic acid, phen = 1,10-phenanthroline). In 1, three distinct coordination polyhedra for Dy(iii) sites including a six-coordinated DyO6 octahedron, a seven-coordinated DyO7 pentagonal bipyramid, and eight-coordinated DyO8 dodecahedron, are observed. These Dy(iii) ions are in turn bridged by L1––carboxylate to give rise to the 1D helical chain structure. Within 2, there are two crystallography-independent Dy(iii) ions that take the mono-capped trigonal bipyramidal geometry. Through L2-carboxylate bridges the Dy(iii) ions are associated together, resulting in the 1D chain structure. Direct current magnetic susceptibilities reveal ferromagnetic interactions, whilst dynamic magnetic studies via alternating current measurements disclose slow magnetic relaxation of these structures.

scholarly journals Pushing the limits of magnetic anisotropy in trigonal bipyramidal Ni(ii)

2015 ◽  
Vol 6 (12) ◽  
pp. 6823-6828 ◽  
Author(s):  
Katie E. R. Marriott ◽  
Lakshmi Bhaskaran ◽  
Claire Wilson ◽  
Marisa Medarde ◽  
Stefan T. Ochsenbein ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
High Spin ◽  
Magnetic Relaxation ◽  
High Field ◽  
Magnetic Studies ◽  
Trigonal Bipyramidal ◽  
Slow Magnetic Relaxation

High-field EPR and magnetic studies of a high-spin Ni(ii) trigonal bipyramidal complex reveal a giant axial magnetic anisotropy and a rare field-induced slow magnetic relaxation.

scholarly journals Crystal structure of a CoIIcoordination polymer with a dipyridyl ligand:catena-poly[[bis(nitrato-κ2O,O′)cobalt(II)]-μ-N-(pyridin-2-ylmethyl)pyridine-3-amine-κ3N,N′:N′′]

2017 ◽  
Vol 73 (11) ◽  
pp. 1696-1699
Author(s):  
Suk-Hee Moon ◽  
Youngjin Kang ◽  
Ki-Min Park
Keyword(s):  
Hydrogen Bonds ◽  
Basal Plane ◽  
Cobalt Atom ◽  
Pentagonal Bipyramid ◽  
Zigzag Chain ◽  
Stacking Interactions ◽  
Coordination Geometry ◽  
Asymmetric Unit ◽  
Centroid Distance ◽  
Nitrate Anions

The asymmetric unit of the title compound, [Co(NO3)2L]n,L=N-(pyridine-2-ylmethyl)pyridine-3-amine (C11H11N3), contains one CoIIcentre, two nitrate anions and oneLligand in which the Cpy—C—N—Cpymoiety adopts atransconformation with a torsion angle of −173.1 (3) Å. The coordination geometry of the CoIIatom is a distorted pentagonal bipyramid. One amine N atom from theLligand and four O atoms from two η2-nitrato ligands form the basal plane and two pyridyl N atoms from two symmetry-relatedLligands occupy the apical positions [N—Co—N = 171.86 (11)°]. The displacement of the central CoIIatom from the basal plane (r.m.s. deviation = 0.085 Å) is 0.1491 (12) Å. Each bidentate nitrate group is bonded asymmetrically to the cobalt atom in an chelating fashion. The CoIIions are linked by theLligands to form a zigzag chain propagating along thec-axis direction. Within the zigzag chain, C—H...O hydrogen bonds between the ligands and the nitrate anions are observed. Adjacent zigzag chains are connectedviaintermolecular π–π stacking interactions [centroid-to-centroid distance = 3.844 (2) Å] between the pyridine rings together with N/C—H...O hydrogen bonds.

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