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Structures and Magnetostructural Correlation Analyses for Two Novel Hexanuclear Complexes Based on a Pentadentate Schiff Base Ligand
Author(s) -
Yang FengLei,
Shao Feng,
Zhu GuangZhou,
Shi YanHui,
Gao Feng,
Li XiuLing
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601698
Subject(s) - crystallography , intramolecular force , antiferromagnetism , chemistry , schiff base , magnetic relaxation , ligand (biochemistry) , ferromagnetism , relaxation (psychology) , ion , copper , stereochemistry , magnetic field , magnetization , condensed matter physics , physics , receptor , psychology , social psychology , biochemistry , organic chemistry , quantum mechanics
]have been synthesized, structurally characterized and magnetically studied. X‐ray diffraction analyses indicated that the potentially pentadentate symmetric ligand affords variable coordination conformations. The copper ions are bound into hexameric moieties with helix‐like arrangement whereas cobalts with four face‐sharing monovacant distorted cubanes. Magnetic investigations revealed that within the hexanuclear unit, compound 1 exhibits antiferromagnetic interactions with the best fit parameters of J 1 =‐17.96 cm −1 , J 2 =‐22.26 cm −1 , zJ =‐0.56 cm −1 and R =1.1 × 10 −5 , while compound 2 affords ferromagnetic intramolecular couplings with the best simulation parameters of J 1 =+0.10 cm −1 ; J 2 =+0.15 cm −1 ; J x = J y =0.1 cm −1 ; J z =0.02 cm −1 ; D 1 =‐0.50; D 2 =‐0.45; g 1 =2.67; g 2 =2.57. Furthermore, the compound 2 displays slow magnetic relaxation behaviour detected by ac magnetic measurement under a 600 Oe field.