TY - JOUR
T1 - Synthesis, structures, and magnetic properties of a series of new heterometallic hexanuclear Co2Ln4 (Ln = Eu, Gd, Tb and Dy) clusters
AU - Tian, Chong Bin
AU - Yuan, Da Qiang
AU - Han, Yun Hu
AU - Li, Zhi Hua
AU - Lin, Ping
AU - Du, Shao Wu
N1 - Publisher Copyright:
© the Partner Organisations 2014.
PY - 2014/11
Y1 - 2014/11
N2 - A series of new Co-Ln heterometallic clusters formulated as [Co2Ln4(μ3-OH)2(piv)4(hmmp)4(ae)2]·(NO3)2·2H2O (Ln = Eu (1), Gd (2), Tb (3), Dy (4), H2hmmp = 2-[(2-hydroxyethylimino)methyl]-6-methoxyphenol, Hae = 2-aminoethanol, Hpiv = pivalic acid) were synthesized and characterized. X-ray crystallography reveals that each of them contains a heterometallic {Ln4Co2} core, which is supported by two μ3-hydroxide, four piv-, four hmmp2- and two ae- ligands. The magnetic investigation indicates that 2 exhibits weak antiferromagnetic interactions between GdIII ions, and a large MCE value of 24.9 J kg-1 K-1, while 4 shows a fast relaxation of magnetization. The TGA and VT-PXRD measurements suggest that all the compounds show good thermal stability and can be stable up to about 220 °C. In addition, to address the influence of the Gd-O-Gd angles on the magnetic properties, compound 2 was compared with a series of compounds involving different bridges between GdIII ions. The comparison reveals that the tiny difference in the Gd-O-Gd angles favors different magnetic coupling.
AB - A series of new Co-Ln heterometallic clusters formulated as [Co2Ln4(μ3-OH)2(piv)4(hmmp)4(ae)2]·(NO3)2·2H2O (Ln = Eu (1), Gd (2), Tb (3), Dy (4), H2hmmp = 2-[(2-hydroxyethylimino)methyl]-6-methoxyphenol, Hae = 2-aminoethanol, Hpiv = pivalic acid) were synthesized and characterized. X-ray crystallography reveals that each of them contains a heterometallic {Ln4Co2} core, which is supported by two μ3-hydroxide, four piv-, four hmmp2- and two ae- ligands. The magnetic investigation indicates that 2 exhibits weak antiferromagnetic interactions between GdIII ions, and a large MCE value of 24.9 J kg-1 K-1, while 4 shows a fast relaxation of magnetization. The TGA and VT-PXRD measurements suggest that all the compounds show good thermal stability and can be stable up to about 220 °C. In addition, to address the influence of the Gd-O-Gd angles on the magnetic properties, compound 2 was compared with a series of compounds involving different bridges between GdIII ions. The comparison reveals that the tiny difference in the Gd-O-Gd angles favors different magnetic coupling.
UR - http://www.scopus.com/inward/record.url?scp=84942420396&partnerID=8YFLogxK
U2 - 10.1039/c4qi00116h
DO - 10.1039/c4qi00116h
M3 - 文章
AN - SCOPUS:84942420396
SN - 2052-1553
VL - 1
SP - 695
EP - 704
JO - Inorganic Chemistry Frontiers
JF - Inorganic Chemistry Frontiers
IS - 9
ER -