Details

Autor(en) / Beteiligte

• Mikuriya, Masahiro
• Hamagawa, Mayu
• Tomioka, Natsuki
• Fujimori, Rika
• Yoshioka, Daisuke
• Hori, Shoichi
• Kuriyama, Taro
• Sakiyama, Hiroshi
• Handa, Makoto
• Mitsuhashi, Ryoji

Titel

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 + ).