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In-Depth Information
5
Model
Exponential
Equation
y = y0 + A*ex
p(R0*x)
Reduced Chi-
Sqr
0.00133
4
Adj. R-Square
0.9993
Value
Standard Error
A
y0
0.10763
0.02349
A
A
0.0187
0.00136
3
A
R0
0.06317
7.99595E-4
2
1
0
30
40
50
60
70
80
90
Temperature (°C)
Figure 23.
Electric conductivity as a function of temperature (T = 35
o
C - 88
o
C) for the ionic liquid
(Q
7
)
6
[
D
-SiW
11
O
39
Cu(H
2
O)] (black squares) and exponential fit (red line).
3.1.4.3 Melting ranges
All of the Keggin clusters synthesized yielded an ionic liquid with Q
7
or Q
8
as the
counterion and with d-elements having a two (e.g. Cu
II
, Mn
II
) or three times (e.g. Cr
III
,
Fe
III
) positive charge. With alkyl chains on the tetraalkylammonium ions shorter than
seven carbon atoms (Q
n
n < 7) the product was obtained as a solid at room
temperature. Table 5 gives a general overview of the charges and the products melting
ranges.
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