Chemistry Reference
In-Depth Information
Fig. 2.31 The room temperature operational 1D polymeric mesogen [Fe(C
12
-tba)
3
](CF
3
SO
3
)
2
arranges in disk-like columns with the iron ions stacked on top of each other in the middle of the
columns. The spin state of the Fe
II
ions depends on the distance d between the disks. At room
temperature, d is relatively small and the LS state (singlet) is favored. On warming the distance d
increases which favors the HS state (doublet) [
53
]
Fig. 2.32 Effect of chain length on the spin state population of [Fe(Cn-tba)
3
](BF
4
)
2
H
2
O(n= 8,
10, 12) investigated by Mössbauer spectroscopy at 80 K [
53
]
