Self-assembled Transition Metal Coordination Frameworks of ...

Chapter 4
The field dependence of magnetic susceptibility for compounds 8 and 9 at 5
and 300 K were studied (Figs. 4. 52 and 4.53), however, do not show any indication of
ferromagnetic component and is in agreement with overall antifrromagnetism. For
complex ll, the susceptibility varies considerably between 55 to 85 K, and for 17 a
variation is seen in between 70 and 85 K. However, the general nature of the
susceptibility curves of all complexes are consistent with strong coupling interactions
between Cu(II) electrons through their connecting moiety. The rapid increase in Xm for
‘I I . . .
some compounds at low temperature is due to monomer impurity.
0.4-I T 0.3% ~ | - _ 0.20 ‘I ‘ . " 0.15 1 ‘ InI­
~ i _ .
I.’
-0.3 '0.15 .­
I|
'
I
'o.4'l'l"I'l'I*|"i‘i 'o'20i""""'i"'JH
oz
_30 _6Q 40 _20
il
Q 20 40 50 30 -80
_.
-60 -40 -20 O 20 40 60 B0
. =
Fig. 4.52. The field dependence of magnetization of Cu(II) complex 8 at 5 K (left)
and 300 K (right).
. l l'
l .
'
0.2- _-' i \.' \
<
-5-—
. -
55 N
--
___._i_i.-.- 1 _ _ ____ __,
II
I0
0.2 _
-0.3-1
-80 -60
*
-40
| +
-20
0 *
0
I
20
+ i
40
+
60
i *
B0
1
-so
- | *
-60
1
-40
; -
-20
, '5
0
| .
20
, .
40
| .
so
, .
so
0.3 , . 5 at
1
. . fl
Magnet“ F1¢]d(|0 Of?) Magnetic Field(l03Oe)
Fig. 4.53. The field dependence of magnetization of Cu(II) complex 9 at 5 K (left)
and 300 K (right).
178