Five-coordinate β-ketoiminate derivatives of the (N3-macrocycle)nickel(II) fragment (N3-macrocycle = 2,4,4-trimethyl-1,5,9-triazacyclododec-1-ene and its 9-methyl derivative)

M. Dolores Santana, Antonio Rufete, Gabriel García, Gregorio López, Jaume Casabó, Araceli Cabrero, Elies Molins, Carles Miravitlles

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Abstract

The hydroxo complexes [{Ni(N3-macrocycle)(μ-OH)}2](ClO4)2 (N3-macrocycle = 2,4,4-trimethyl1,5,9-triazacyclododec-1-ene (N3-mc) and 2,4,4,9-tetramethyl-1,5,9-triazacyclododec-1-ene (9-Me-N3-mc)) react with the appropriate β-ketoimine to give five-coordinate nickel(II) complexes of the type [Ni(N3-macrocycle) (C6H5COCHC(NR)CH3)](ClO4). The complexes have been studied by spectroscopic (IR, UV-vis, 1H NMR and NOE) and thermal methods. An X-ray diffraction study carried out with the complex [Ni(9-Me-N3-mc){C6H5COCHC(NC6H 5)CH3}](ClO4) has established that the Ni atom presents a square pyramidal coordination and is displaced 0.325(1) Å out of the basal plane towards the apical N1 atom. © 1997 Elsevier Science Ltd.
Original languageEnglish
Pages (from-to)3713-3721
JournalPolyhedron
Volume16
Issue number21
DOIs
Publication statusPublished - 1 Jan 1997

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