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Fig. 4.8 Phase diagram of [Pd(en)
2
Br](C
n
-Y)
H
2
O
Fig. 4.9 Crystal structures of (a) [Ni(chxn)
2
Br]Br
2
and (b) [Pd(chxn)
2
Br]Br
2
been extensively studied by optical [
8
] and ESR [
9
] spectroscopies, X-ray diffuse
scattering [
10
], scanning tunneling microscopy [
11
], etc. In this section, we intro-
duce their structure and physical properties.
4.3.1 Structure and Electronic States of [M(chxn)
2
Br]Br
2
(M
¼
Ni, Pd)
A crystal structure of [Ni(chxn)
2
Br]Br
2
is shown in Fig.
4.9a
[
12
]. In this structure,
the Ni(III) ions and Br
ions alternate with equivalent Ni-Br distances, and the four
N atoms of the two chxn ligands coordinating to each Ni(III) ion in the equatorial
positions producing a strong ligand field. Each Ni-Br-Ni 1D chain is hydrogen
bridged between the amino-protons of chxn and counter Br ions along the chains, as
well as over the chains, forming two-dimensional hydrogen-bond networks.
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