scholarly journals Syntheses, Structures and Magnetic Properties of M2 (M = Fe, Co) Complexes with N6 Coordination Environment: Field-Induced Slow Magnetic Relaxation in Co2

2021 ◽  
Vol 7 (12) ◽  
pp. 153
Author(s):  
Qianqian Yang ◽  
Xiao-Lei Li ◽  
Jinkui Tang

Two dinuclear complexes [M2(H2L)2](ClO4)4·2MeCN (M = Co for Co2 and Fe for Fe2) were synthesized using a symmetric hydrazone ligand with the metal ions in an N6 coordination environment. The crystal structures and magnetic properties were determined by single-crystal X-ray diffraction and magnetic susceptibility measurements. The crystal structure study revealed that the spin centers were all in the high-spin state with a distorted octahedron (Oh) geometry. Dynamic magnetic properties measurements revealed that complex Co2 exhibited field-induced single-molecule magnet properties with two-step relaxation in which the fast relaxation path was from QTM and the slow relaxation path from the thermal relaxation under an applied field.

2019 ◽  
Vol 43 (33) ◽  
pp. 12941-12949 ◽  
Author(s):  
Wen-Min Wang ◽  
Li Zhang ◽  
Xian-Zhen Li ◽  
Li-Yuan He ◽  
Xin-Xin Wang ◽  
...  

A family LnIII4 clusters were successfully synthesized and structurally characterized. Magnetic studies show that Gd4 cluster displays magnetic refrigeration, while Dy4 cluster demonstrates two distinct slow magnetic relaxation processes.


RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23444-23449 ◽  
Author(s):  
Kunal Kumar ◽  
Daisuke Abe ◽  
Keiko Komori-Orisaku ◽  
Olaf Stefańczyk ◽  
Koji Nakabayashi ◽  
...  

In this work, we investigated thermally-induced Nd-based one centred ratiometric thermometer which also exhibit single molecule magnetic properties.


2017 ◽  
Vol 53 (14) ◽  
pp. 2283-2286 ◽  
Author(s):  
Brian S. Dolinar ◽  
Silvia Gómez-Coca ◽  
Dimitris I. Alexandropoulos ◽  
Kim R. Dunbar

Addition of a radical to the bridging tetrazine ligand of a Dy2 complex dramatically alters the magnetic properties. The radical complex undergoes magnetic relaxation via a thermal relaxation pathway, whereas the neutral compound relaxes via quantum tunneling of the magnetization.


2016 ◽  
Vol 45 (22) ◽  
pp. 9320-9327 ◽  
Author(s):  
Rebecca J. Holmberg ◽  
Marina A. Polovkova ◽  
Alexander G. Martynov ◽  
Yulia G. Gorbunova ◽  
Muralee Murugesu

Homonuclear and novel heteronuclear TbIII/YIII triple-decker heteroleptic crownphthalocyaninate complexes have been synthesized and studied for their SMM properties.


2021 ◽  
Author(s):  
Denis V. Korchagin ◽  
Yaroslav E. Gureev ◽  
Elena A. Yureva ◽  
Gennady V. Shilov ◽  
Alexander V. Akimov ◽  
...  

Synthesis and characterization of structure and magnetic properties of the quasi-octahedral complex (pipH2)[Co(TDA)2] 2H2O (I), (pipH22+ = piperazine dication, TDA2-= thiodiacetic anion) are described. X-ray diffraction studies reveal the first...


2013 ◽  
Vol 66 (1) ◽  
pp. 75 ◽  
Author(s):  
Yan Zhu ◽  
Feng Luo ◽  
Xue-Feng Feng ◽  
Zhen-Wei Liao ◽  
Yu-Mei Song ◽  
...  

In this work, based on mixed N-, O-donor ligands, a series of Co(ii)-Dy(iii) compounds are synthesised and characterised by single crystal X-ray diffraction and magnetic studies. These compounds include Co2(phen)2Dy(PhCOO)7 (1), Co2(phen)2Dy2(PhCOO)10 (2), Co(bpy)Dy(H2O)(CH3-PhCOO)5 (3), Co(phen)Dy(H2O)(CH3-PhCOO)5 (4), Co2(phen)2Dy(NO2-PhCOO)7 (5), Co2(phen)2Dy2(NO2-PhCOO)10 (6), and Co2(bpy)2Dy2(NO2-PhCOO)10 (7), where phen, bpy, CH3-PhCOOH, and NO2-PhCOOH are 1,10-phenanthroline, 2,2′-bipyridine, 3-methylbenzoic acid, and 3-nitrobenzoic acid, respectively. In these cases, di-, tri-, and tetranuclear Co-Dy clusters are observed. Direct current (DC) magnetic susceptibility reveals ferromagnetic or antiferromagnetic behaviour, whilst dynamic magnetic studies disclose single molecule magnet (SMM)-like slow magnetic relaxation for most of these compounds.


2018 ◽  
Author(s):  
Guillermo Minguez Espallargas ◽  
Javier Castells-Gil ◽  
Carlos Marti-Gastaldo ◽  
Jose J. Baldovi

<p>Here we report the structural flexibility of a Dy-based Single-Ion Magnet MOF in which its magnetic properties can be modified through a ligand substitution process involving an increase of the charge density of the coordination environment.</p>


2019 ◽  
Vol 5 (2) ◽  
pp. 30 ◽  
Author(s):  
Ryuta Ishikawa ◽  
Shoichi Michiwaki ◽  
Takeshi Noda ◽  
Keiichi Katoh ◽  
Masahiro Yamashita ◽  
...  

A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd (1), Tb (2), Ho (3), Er (4), and Yb (5) was synthesized. All five complexes were characterized by an elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, and SQUID measurements. The complexes 1–5 in the series were all isostructural. A comparison of the temperature dependence of the dc magnetic susceptibility data of these complexes revealed clear differences depending on the lanthanide center. Ac magnetic susceptibility measurements revealed that none of the five complexes exhibited a slow magnetic relaxation under a zero applied dc field. On the other hand, the Kramers systems (complexes 4 and 5) clearly displayed a slow magnetic relaxation under applied dc fields, suggesting field-induced single-molecule magnets that occur through Orbach and Raman relaxation processes.


2021 ◽  
Vol 13 (7) ◽  
pp. 1253-1258
Author(s):  
Cai-Wen Zhang ◽  
You-Juan Zhang ◽  
Jing Chen ◽  
Qing-Lun Wang

ABSTRACTAn 1D Cu(II) complex, which formula is [Cu(hfac)2NITpPy]n (1) (NITpPy = 2-(4-pyridyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide, hfac = hexafluoroacetylacetonate) has been synthesized and characterized by single crystal X-ray diffraction. The complex 1 crystallizes in the triclinic pī space group. Two adjacent Cu(II) ions with different coordination modes are bridged by NITpPy to form a magnetic zig-zag chain. In the built chains, the Cu(II) ions located in the CuO4N2 coordination environment and the >N–O–Cu(II)- O–N< hetero-spin clusters of the CuO6 units are alternately arranged, which lead to two different Cu-NITpPy magnetic interactions. The fit parameters (J1 = −3.56 cm−1 and J2 = 0.46 cm−1) indicate an antiferromagnetic and ferromagnetic interactions in the complex 1.


2015 ◽  
Vol 44 (11) ◽  
pp. 5086-5094 ◽  
Author(s):  
Amit Kumar Mondal ◽  
Soumyabrata Goswami ◽  
Sanjit Konar

Two luminescent mononuclear Dy(iii) based complexes with SMM behaviour have been reported. The SMM behaviours differ due to the slight variation of local symmetry around the Dy(iii) centers and photoluminescence study showed quantum yields of 0.98 and 1.44%.


Sign in / Sign up

Export Citation Format

Share Document