A general method for the synthesis of hitherto unreported pentadentate fluorinated Schiff base ligands is presented. Two new five-coordinate metal complexes, Ni(tfacDPT) and Cu(tfacDPT), where H2(tfacDPT) is the pentadentate Schiff base derived from trifluoroacetylacetone and bis(3,3'-aminopropyl)amine, have been prepared and characterized by various physical techniques. Data for the Cu(II) complex indicate that it is square pyramidal while electronic spectra for the high spin Ni(II) complex suggest that it may possess a geometry intermediate between square pyramidal and trigonal bipyramidal. Ni(tfacDPT) coordinates with pyridine to produce a pseudooctahedral adduct, Ni(py)(tfacDPT), which releases pyridine in vacuo or on gentle heating of the complex.
Die sauren Salze des einseitig kondensierten Schiffschen‐Basen‐Liganden, dargestellt aus äquimolaren Mengen Acetylaceton und Äthylendiamin unter Zugabe von NaJ oder Ammoniumhexafluorophosphat bei pH 5, bildet mit Ni(II)‐ oder Cu(II)‐hydroxid die quadratisch‐planaren Komplexe (Ia).
Die aus Trifluoracetylaceton und Bis‐[3,3′‐aminopropyl]‐amin synthetisierte Schiffsche Base (Ausbeute 30%) bildet bei der Umsetzung mit′Ni(II)‐ bzw. Cu(II)‐acetat in DMF 1:1‐Komplexe, die durch elektronen‐ und IR‐spektroskopische sowie magnetische Untersuchungen, Leitfähigkeitsmessungen und Molgewichtsbestimmungen charakterisiert werden.
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