Ferromagnetic exchange coupling and magneto-structural correlations in mixed-bridged trinuclear copper(II) complexes. Magnetic data and theoretical investigations and crystal structures of two angled CuII3 complexes

1993 ◽  
Vol 32 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Stefan Gehring ◽  
Peter Fleischhauer ◽  
Helmut Paulus ◽  
Wolfgang Haase
Keyword(s):  
Crystal Structures ◽  
Exchange Coupling ◽  
Magnetic Data ◽  
Ferromagnetic Exchange ◽  
Theoretical Investigations

scholarly journals Nitronyl Nitroxide Biradical-Based Binuclear Lanthanide Complexes: Structure and Magnetic Properties

2020 ◽  
Vol 6 (4) ◽  
pp. 48
Author(s):  
Lu Xi ◽  
Jing Han ◽  
Xiaohui Huang ◽  
Licun Li
Keyword(s):  
Magnetic Properties ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Magnetic Data ◽  
Antiferromagnetic Coupling ◽  
Zero Field ◽  
Nitronyl Nitroxide ◽  
Ferromagnetic Exchange ◽  
Binuclear Structure ◽  
Slow Magnetic Relaxation

Employing a new nitronyl nitroxide biradical NITPhPzbis(NITPhPzbis = 5-(1-pyrazolyl)-1,3-bis(1’-oxyl-3’-oxido-4’,4’,5’,5’-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene), a series of 2p-4f complexes [Ln2(hfac)6(H2O)(NITPhPzbis)] (LnIII = Gd1, Tb2, Dy3; hfac = hexafluoroacetylacetonate) were successfully synthesized. In complexes 1–3, the designed biradical NITPhPzbis coordinates with two LnIII ions in chelating and bridging modes to form a four-spin binuclear structure. Direct-current magnetic study of Gd analogue indicates that ferromagnetic exchange exists between the Gd ion and the radical while antiferromagnetic coupling dominates between two mono-radicals. Dynamic magnetic data show that the χ” signals of complex 3 exhibit frequency dependence under zero field, demonstrating slow magnetic relaxation behavior in complex 3. And the estimated values of Ueff and τ0 are about 8.4 K and 9.1 × 10−8 s, respectively.

scholarly journals Coordination chemistry and photoswitching of dinuclear macrocyclic cadmium-, nickel-, and zinc complexes containing azobenzene carboxylato co-ligands

2019 ◽  
Vol 15 ◽  
pp. 840-851
Author(s):  
Jennifer Klose ◽  
Tobias Severin ◽  
Peter Hahn ◽  
Alexander Jeremies ◽  
Jens Bergmann ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Crystal Structure Analysis ◽  
Mixed Ligand ◽  
Ionization Mass ◽  
Coupling Constant ◽  
Magnetic Exchange ◽  
X Ray ◽  
Magnetic Exchange Coupling ◽  
Ferromagnetic Exchange ◽  
Single Crystal Structure Analysis

The synthesis of mixed-ligand complexes of the type [M2L(μ-L')]+, where L represents a 24-membered macrocyclic hexaaza-dithiophenolate ligand, L' is an azobenzene carboxylate co-ligand, and M = Cd(II), Ni(II) or Zn(II), is reported. A series of new complexes were synthesized, namely [M2L(μ-L')]+ (L' = azo-H, M = Cd (1), Ni (2); L' = azo-OH, M = Zn (3), Ni (4); L' = azo-NMe2, M = Zn (5), Cd (6), Ni (7); L' = azo-CO2Me, M = Cd (8), Ni (9)), and characterized by elemental analysis, electrospray ionization mass spectrometry (ESIMS), IR, UV–vis and NMR spectroscopy (for diamagnetic Zn and Cd complexes) and X-ray single crystal structure analysis. The crystal structures of 3' and 5–8 display an isostructural series of compounds with bridging azobenzene carboxylates in the trans form. The paramagnetic Ni complexes 2, 4 and 7 reveal a weak ferromagnetic exchange interaction with magnetic exchange coupling constant values between 21 and 23 cm−1 (H = −2JS1S2). Irradiation of 1 with λ = 365 nm reveals a photoisomerization of the co-ligand from the trans to the cis form.

Ferromagnetic exchange coupling in a new bis(μ-chloro)-bridged copper(II) Schiff base complex: Synthesis, structure, magnetic properties and catalytic oxidation of cycloalkanes

Polyhedron ◽  
2009 ◽  
Vol 28 (4) ◽  
pp. 695-702 ◽  
Author(s):  
Santarupa Thakurta ◽  
Partha Roy ◽  
Georgina Rosair ◽  
Carlos J. Gómez-García ◽  
Eugenio Garribba ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Catalytic Oxidation ◽  
Exchange Coupling ◽  
Schiff Base Complex ◽  
Base Complex ◽  
Ferromagnetic Exchange

A binuclear Ni(II) complex with 2,2′:6′,2″-terpyridine exhibiting ferromagnetic exchange coupling

1989 ◽  
Vol 162 (1) ◽  
pp. 11-13 ◽  
Author(s):  
Teófilo Rojo ◽  
Roberto Cortes ◽  
Luis Lezama ◽  
Jose Luis Mesa ◽  
Gérard Villeneuve
Keyword(s):  
Exchange Coupling ◽  
Ferromagnetic Exchange

Anti-ferromagnetic Exchange Coupling in L10-MnGa/Co Bilayer Films

2013 ◽  
Author(s):  
R. Ranjbar ◽  
S. Mizukami ◽  
A. Sugihara ◽  
Q.L. Ma ◽  
S. Iihama ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Bilayer Films ◽  
Ferromagnetic Exchange
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