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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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