Facile Synthesis and Relaxation Properties of Novel Bispolyazamacrocyclic Gd3+ Complexes: An Attempt towards Calcium-Sensitive MRI Contrast Agents

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• 作者：Anurag Mishra ; Petra Fousková ; Goran Angelovski ; Edina Balogh ; Anil K. Mishra ; Nikos K. Logothetis ; &#xc9 ; va Tó ; th
• 刊名：Inorganic Chemistry
• 出版年：2008
• 出版时间：April 21, 2008
• 年：2008
• 卷：47
• 期：8
• 页码：3460 - 3460
• 全文大小：96K
• 年卷期：v.47,no.8(April 21, 2008)
• ISSN：1520-510X

文摘

A π-extended, redox-active tetradentate tetrathiafulvalene-fused salphen [salphen = N,N′-phenylenebis(salicylideneimine)] compound (L) was prepared via a direct Schiff-base condensation of the corresponding diamine-tetrathiafulvalene (TTF) precursor with salicylaldehyde. Its chelating coordination ability has been demonstrated by the formation of the corresponding transition metal complexes in the presence of M(OAc)₂·nH₂O (M = Co(II), Ni(II), Cu(II)) and FeCl₃·6H₂O. Three complexes have been characterized by single-crystal X-ray diffraction analysis showing that the TTF-salphen ligand coordinates to the metal ions in a planar mode through the nitrogen and oxygen atoms in a N₂O₂ cis-configuration. In the case of Fe(III), a dinuclear oxo-bridged Fe(III) complex is formed. These paramagnetic complexes are promising building blocks for the construction of dual functional materials due to their unique structural features (planarity and rigidity) as well as their inherent redox properties.