Self-assembled Transition Metal Coordination Frameworks of ...

Chapter 5
The temperature dependence of 1,, and }l¢ff curves of complex 20 is given in Fig. 5.22.
-
It is found that the fit departs from the experimental data especially at lower
temperatures. This may be associated
I with presence of other ­interactions in the
compound 20. To fit and interpret the magnetic susceptibility data, first it is necessary
to find all
3.0possible
magnetic pathways in the complex structure, and in the absence of
X-ray structural result it is not possible to use any magnetic interacting models.
" |
0
' I I |
I
~ r
I
'
I-
. n ' I ' AI ' |
I I
. -
"
0.04
2.5- _ IQ . I I ‘T | ' _ '*
'
0-03 '7-' '
I
id
- .
nun
O-/
I
_ - . - 0.01
1.5- -Q
I ...
1.0- .."0O000ooo0o00 *
1 | I | I I I | I | I I I | I | I
0 50 100 150 200 250 300 350
T (K)
Fig. 5.22. Temperature dependence of molar magnetic susceptibility X,“ (0) and
effective magnetic moment |,l¢ff (u) of dimanganese(II) complex 20.
5.4. Concluding remarks
This chapter presents syntheses and physico-chemical characterizations of
five novel manganese coordination compounds. Four of them are assigned as
molecular square grids of Mn(II), of which three Mn(H) carbohydrazone complexes
are with a general formula [Mn2(H2L)HL]2(ClO4)6- nH;O. The Mn(II)
thiocarbohydrazone square complex is having a formula [Mn2(HL2)L2]2Cl;- CHCl3­
9H2(). Mn(II) square complexes of carbohydrazones and thiocarbohydrazones are
224