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Magnetic Materials 2018
Materials Science and Nanotechnology
|
Volume 2
MAGNETISM AND
MAGNETIC MATERIALS
2
nd
International Conference on
Lomjanský D et al., Mater Sci Nanotechnol 2018, Volume 2
DIFFERENT MAGNETIC PROPERTIES OF
NI(II) COMPLEXES WITH (PSEUDO)HALIDE
LIGANDS DEPENDING ON THEIR GEOMETRY
Lomjanský D, Rajnák C, Titiš J, Moncoľ J, Smolko L
and
Boča R
University of SS Cyril and Methodius, Slovakia
F
our tetracoordinate Ni(II) complexes have been prepared, structurally
characterized, and subjected to magnetometric studies. The complexes
[Ni(
PPh
3
)
2
(NCS)
2
], [Ni(
dppp
)(NCS)
2
], and [Ni(
dppm
)Br
2
] are planar and thus
diamagnetic.The complex [Ni(
biqu
)Br
2
] is quasi-tetrahedral, with the geometry
close to C
2v
symmetry, and paramagnetic. While on one side it resembles a
prolate bisphenoid (the angle N-Ni-N=83 deg), on the second side it mimics
an oblate bisphenoid (Br-Ni-Br=126 deg). It exhibits a zero-field splitting of
the ground term
3
A
2
into three crystal-field multiplets that can be described
by D and E parameters within the spin Hamiltonian formalism. The ab initio
calculations confirm this interpretation; however, the evaluation of the spin-
Hamiltonian parameters meets difficulties owing to the quasi-degeneracy of
the electronic terms.
lomjanskyd@gmail.com