ISSN 10703284, Russian Journal of Coordination Chemistry, 2015, Vol. 41, No. 5, pp. 305–311. © Pleiades Publishing, Ltd., 2015.
In recent years, the rational design and construction
heterometallic coordination polymers have
provoked the interest of chemists not only due to their
potential applications in the fields of magnetism, lumi
gas adsorption, and bimetallic catalysis, but
also their fascinating architectures and arrays [1–3].
From the magnetic viewpoint, molecular magnetic
materials based on transition metal ions, such as Co
have been extensively studied because the high spin
ground state can be obtained from strong exchange in
teraction between 3
electrons. However, a high spin
ground state and significant magneto anisotropy can
not be simultaneously achieved easily in 3
due to the small spinflip.
The magnetic properties of
large magnetic anisotropy of lanthanides continue to
be an attractive research field because of their unique
and intriguing properties and potential applications in
molecular spintronics . Couplings between the lan
thanide and transition metallic ions (
) are much
interactions, and the combination of
such two kinds of spin carriers into a singular material
help to improve their magnetic properties in
erometallic materials .
However, no systematic in
vestigation of zeolitetype functional materials con
taining lanthanide metal atoms series along with the
transition metal atoms has been documented system
atically , and Ln–Co heteronuclear metal organic
frameworks (MOFs) with 3D framework structures
The article is published in the original.
have been seldom reported yet. This is due to the prac
tically challenging syntheses of 3
MOFs. One of the difficulties is how to control the vari
able coordination environment of the lanthanide ions .
As continuation of our previous research ,
we have ex
tended this idea by application of a simple H
ligand for construction of heterometallic MOFs
Mimda = 1
acid) with novel architectures and interesting properties.
and physical measurements.
thanide oxides were purchased from Jinan Henghua
Sci. & Tec. Co. Ltd. Erbium nitrate was prepared by
the reaction of erbium oxides and nitric acid (11 mol/L).
Elemental analyses (C, H, and N) were performed on
a PerkinElmer 2400 element analyzer. IR spectra
were recorded in the range 400–4000 cm
VECTOR22 spectrometer using KBr discs. Magnetic
data were obtained using a Quantum Design MPMS
SQUID 7S magnetometer at an applied field of 2000 Gs
using multicrystalline samples in the temperature
range of 1.8–300 K. The magnetic susceptibilities
were corrected using Pascal’s constant for all the con
stituent atoms and sample holders. Thermogravimet
ric (TG) and differential thermal analysis (DTA) ex
periments were performed using a TGA/NETZSCH
STA449C instrument heated from 25–900
rate of 10
C/min in nitrogen stream). The powder
through Substituted ImidazoleDicarboxylate: Synthesis,
Structure, and Characterization
*, C. L. Wang
, J. Zhao
, S. Y. Xie
, L. Y. Wang
and SeikWeng Ng
College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, 471022 P.R. China
School of Life Science and Technology, Nanyang Normal University, Nanyang, 473601 P.R. China
Department of chemistry, University of Malaya, Kuala Lumpur, 50603, Malaysia
Received September 27, 2014
A heteronuclear metal organic framework containing erbium(III) and cobalt(II) ion based on a rigid
ligand of substituted imidazoledicarboxylic acid has been synthesized and characterized by singlecrystal Xray dif
fraction analysis (CIF file CCDC no. 1019455). It’s formula is [Er
Mimda = 1
2methyl4,5imidazoledicarboxylic acid). The complex crystallizes in the monoclinic
system. It possesses an extended gridlike porous structure constructed from corrugated shaped 2D layer. Direct cur
rent magnetic susceptibility measurements for
indicated the depopulation of the Stark components at low temper
ature and possible very weak antiferromagnetic interactions within heteronuclear MOF.