Synthesis, crystal structure, and properties of copper(II) complexes with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane
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MIKURIYA, Masahiro, HAMAGAWA, Mayu, TOMIOKA, Natsuki, YOSHIOKA, Daisuke, UEHARA, Naoko, FUJIMORI, Rikai, YAMAMOTO, Hiroki, ANDO, Yoshinari, HORI, Shoichi, KURIYAMA, Taro, MITSUHASHI, Ryoji, HANDA, Makoto. Synthesis, crystal structure, and properties of copper(II) complexes with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane. In: Chemistry Journal of Moldova, 2015, nr. 2(10), pp. 40-47. ISSN 1857-1727. DOI: https://doi.org/10.19261/cjm.2015.10(2).04
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Chemistry Journal of Moldova
Numărul 2(10) / 2015 / ISSN 1857-1727 /ISSNe 2345-1688

Synthesis, crystal structure, and properties of copper(II) complexes with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane
DOI: https://doi.org/10.19261/cjm.2015.10(2).04
CZU: 548.7

Pag. 40-47

Mikuriya Masahiro1, Hamagawa Mayu1, Tomioka Natsuki1, Yoshioka Daisuke1, Uehara Naoko1, Fujimori Rikai1, Yamamoto Hiroki1, Ando Yoshinari1, Hori Shoichi1, Kuriyama Taro1, Mitsuhashi Ryoji1, Handa Makoto2
 
1 Kwansei Gakuin University,
2 Shimane University
 
Disponibil în IBN: 28 decembrie 2015


Rezumat

Three kinds of copper(II) complexes with 1,4,7-tris(2-aminoethyl)-1,4,7-triazacyclononane (taetacn), [Cu(taetacn)](ClO4)2 (1), [Cu(Htaetacn)](ClO4)3 (2), and [Cu(Htaetacn)](BF4)3 (3) were synthesized and characterized by elemental analyses, IR and UV-Vis spectroscopies. The spectral features are in harmony with an octahedral geometry for 1 and a square-pyramidal coordination for 2 and 3. The crystal structure of 2 was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the orthorhombic space group Pnma with a = 20.605(3) Å, b = 12.7944(18) Å, c = 9.8972(14) Å, V = 2609.2(6) Å3, Dx = 1.582 g/cm3, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0723 and 0.2389, respectively, for all 3253 independent reflections. The compound consists of squarepyramidal copper(II) cation with protonated Htaetacn and tetrahedral ClO4 – anions. The temperature dependence of magnetic susceptibilities obeyed the Curie-Weiss law with Ɵ = –2.4, –5.2 and –7.2 K for 1, 2, and 3, respectively. Cyclic voltammetry of 2 in DMF showed two quasi-reversible reduction waves (Epc = –0.98, Epc = –0.92; Epc = –1.30, Epc = –1.22 V versus Fc/Fc ).

Cuvinte-cheie
copper(II) complex, magnetic properties, 1,

macrocyclic ligand, 7-triazacyclononane,

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