Syntheses and Characterization by NMR Spectroscopy and X-ray Diffraction of Complexes Derived from Metals of Groups 2 and 13 and the Ligand Bis(3,5-di-tert-butyl-1-hydroxy-2-phenyl)amine
✍ Scribed by Carlos Camacho-Camacho; Gabriel Merino; Francisco Javier Martínez-Martínez; Heinrich Nöth; Rosalinda Contreras
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 303 KB
- Volume
- 1999
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
3,5-di-tert-butyl-1-hydroxy-2phenyl)amine ligand / Nonacoordinated strontium compound Reaction of 3,5-di-tert-butylcatechol and aqueous ammonia to the metal atoms. The ligands appear in two different oxidation states: one as the monoanion and another as a with boron, aluminum, gallium, or strontium chloride, or with calcium or barium acetate produce, under oxidizing radical dianion. Based on their X-ray diffraction molecular structures, it is deduced that both ligands have similar conditions, neutral complexes of stoichiometric formulae ML (M = BCl), ML 2 , [M = Al (2), Ga (3), Ca (4), and Ba ( )], and structures, confirming electronic delocalization and fast interconversion of their oxidation states. Ca and Ba ML 3 H [M = Sr ( )] [L = different oxidation states of bis(3,5di-tert-butyl-1-hydroxy-2-phenyl)amine]. The structures of 1 complexes are diamagnetic and hexacoordinated, both ligands being monoanions The strontium complex and 4-6 were established by 1 H-and 13 C-NMR spectroscopy and of 2, 3, and 6 by X-ray diffraction. The coordination crystallized in the monoclinic system, the metal atom is nonacoordinated, having two ligands as monoanions, and a compound ClBL (1) was obtained by transmetallation of ZnL 2 with BCl 3 . It is a tetracyclic compound with tetracoordinated third one is a neutral protonated diquinone. Its structure is a distorted helix with three paddles in a C 3 geometry and its boron and nitrogen atoms, the ligand being in the reduced form, bis(hydroxyphenyl)amine. The paramagnetic com-unexpected diamagnetic behaviour is due to the presence of a reduced protonated ligand. plexes 2 and 3 crystallized in the triclinic system and are hexacoordinated with two orthogonal planar ligands bonded atom. The complexes have two planar, tridentate ligands.
[a] Departamento de Sistemas Biolo ´gicos, Universidad Auto ´noma these compounds have been performed. [11Ϫ21] The magnetic Metropolitana-Xochimilco, Calzada del Hueso 1100, Col. Villa Quietud, Me ´xico 04960 D.F