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Structure and characterization of non-cyclic tetraaza complexes of copper(II) and their reactions with nitric oxide |
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| Authors: | Chee-Hun Kwak Joo-Eun Jee Jinkwon Kim |
| Affiliation: | a Department of Chemistry, Sunchon National University, Sunchon 540-742, Republic of Korea b Department of Chemistry and National Research Laboratory of Nano Molecular Materials, Kongju National University, Kongju 314-701, Republic of Korea c Institute for Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany |
| Abstract: | [Cu(bapp)ClO4]+ (1) and [Cu(bapp)Cl]+ (2) were prepared by the reaction of 1,4-bis(3-aminopropyl)piperazine (bapp) with copper acetate and copper chloride in the presence of sodium perchlorate, respectively, and structurally characterized. Complex 1 has a square-pyramidal geometry, whereas [Cu(3,2,3-tet)(ClO4)]+ (A) has a polymeric octahedral geometry in its X-ray crystal structure. Complex 1 is stable against disproportionation, whereas complex A is unstable in the mono-valent Cu(I) state. An aqua ligand on complex 1 in aqueous solution is substituted by NO with kinetic constants of kf=43±2 M−1 s−1 and kb=(8.8±0.2)×10−2 s−1 at 25 °C, whereas there were no spectral changes observed for complex A in saturated NO solution. |
| Keywords: | Cu(II) complex 1,4-Bis(3-aminopropyl)piperazine (bapp) Square-pyramidal Aqua ligand Substitution NO |
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