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Nickel(II) complex with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane
Ist Teil von
Chemical papers, 2016, Vol.70 (1), p.69-74
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2016
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A nickel(II) complex, [Ni(taetacn)](ClO
4
)
2
⋅ H
2
O, where taetacn = 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane was synthesized. The crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. The complex crystallizes in the orthorhombic space group
Pna
2
1
with
a
= 16.004(2) Å,
b
= 10.186(1) Å,
c
= 13.937(2) Å,
V
= 2271.9(5) Å
3
,
D
x
= 1.56 g cm
−3
, D
m
= 1.59 g cm
−3
(floatation method), and
Z
= 4. The
R
1
[
I
> 2
σ
(
I
)] and
wR
2
(all data) values are 0.0636 and 0.1672, respectively, for all 4845 independent reflections. The compound is composed of octahedral nickel(II) cation with three 2-aminoethyl pendant groups of taetacn, tetrahedral ClO
4
−
anion, and a water molecule of crystallization. Electronic spectra are consistent with the octahedral geometry. Temperature dependence of the magnetic susceptibility (4.5–300 K) can be interpreted considering the zero-field splitting of the nickel(II) ion (
g
= 2.14,
D
= 3.72 cm
−1
, and
Nα
= 300 × 10
−6
cm
3
mol
−1
). Cyclic voltammetry in DMF showed quasi-reversible and irreversible oxidation waves (
E
pa
= 0.54 V,
E
pc
= 0.45 V;
E
pa
= 1.16 V,
E
pc
= 0.71 V vs. Ag/Ag
+
).