کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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171084 | 458432 | 2007 | 12 صفحه PDF | دانلود رایگان |
New dicopper(II) complexes with pyrazolate-derived compartmental ligands that bear pyridyl or triazacyclononane chelate arms have been prepared and fully characterized, including several single-crystal X-ray analyses. These complexes complement a series of dicopper compounds with related pyrazolate ligands reported earlier. Modifications of the ligand scaffold are shown to control molecular features such as the Cu⋯Cu separation and electronic and spectroscopic properties. Catecholase activity of the new complexes has been probed using 3,5-di-tert-butylcatechol (DTBC) as the test substrate, revealing Michaelis–Menten-type kinetics with drastic differences in activity for the assortment of complexes. Their common skeletal motif based on the pyrazolate bridge allowed us to deduce some relationship between activity and Cu⋯Cu separation as well as CuII/CuI redox potentials. A dramatic effect of the buffer medium on reactivity has been observed.
Journal: Comptes Rendus Chimie - Volume 10, Issues 4–5, April–May 2007, Pages 421–432