Lanthanide dinuclear complexes constructed from mixed oxygen-donor ligands: the effect of substituent positions of the neutral ligand on the magnetic dynamics in Dy analogues.

Content Provider	Semantic Scholar
Author	Zhu, Wen-Hua Li, Shan Gao, Chen Xiong, Xia Zhang, Yan Powell, Annie K. Gao, Song
Copyright Year	2016
Abstract	Two series of lanthanide dinuclear complexes with the general formulae, [Ln(n-PNO)(Bza)3(H2O)] {Bza = benzoic acid; n = 3, n-PNO = 3-picoline N-oxide, Dy(1) and Er(2); and n = 4, n-PNO = 4-picoline N-oxide, Nd(3), Eu(4), Gd(5), Tb(6), Dy(7), Er(8) and Y(9)} have been successfully synthesized by the hydrothermal method. Single-crystal X-ray diffraction experiments illustrate that the two series of compounds possess similar carboxylic ligand-bridged dinuclear structure and coordination geometry around the lanthanide ions despite the different methyl-substituent positions on the neutral ligand. Comparative studies of the Dy analogues in the static-field measurements reveal only a little difference with a small butterfly-shaped opening for complex 1 and a close hysteresis loop for 7 at 2.0 K. However, systematic investigations of the alternating-current (ac) measurements indicate that the different substituent positions of the picoline N-oxide ligand have a significant effect on the magnetic relaxation dynamics. A more substantial suppression of the quantum tunnelling of magnetization (QTM) effect and pronounced slow magnetic relaxation were observed in complex 7 as compared to 1 under both zero and a 1 kOe static field.
File Format	PDF HTM / HTML
DOI	10.1039/c5dt04850h
PubMed reference number	26847996
Journal	Medline
Volume Number	45
Issue Number	11
Alternate Webpage(s)	http://www.rsc.org/suppdata/c5/dt/c5dt04850h/c5dt04850h1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/c5dt04850h
Journal	Dalton transactions
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article