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Two new Ni(II) Schiff base complexes: X-ray absolute structure determination, synthesis of a 15N-labelled complex and full assignment of its 1H NMR and 13C NMR spektra.
Authors: Langer Vratislav | Popkov Alexandr | Nádvorník Milan | Lyčka Antonín
Year: 2007
Type of publication: článek v odborném periodiku
Name of source: Polyhedron
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 911-917
Titles:
Language Name Abstract Keywords
cze Two new Ni(II) Schiff base complexes: X-ray absolute structure determination, synthesis of a 15N-labelled complex and full assignment of its 1H NMR and 13C NMR spektra. The Ni(II) complex of the Schiff base of (S)-N-(2-benzoyl-4-chlorophenyl)-1-benzylpyrrolidine-2-carboxamide and glycine (1) [GKCl] and the hemihydrate of the Ni(II) complex of the Schiff base of (S)-N-(2-benzoylphenyl)-1-benzylpyrrolidine-2-carboxamide and 2-aminoisobutiric acid (2) [Me2GK] were prepared and their absolute structures determined. The conformations of the complexes and their hydrogen bonding are discussed in detail. In complex 2, the repulsion between the benzyl group and an equatorial methyl group should affect the conformation of the benzyl group, distribution of the p-electron density in this group and distortion of the internal coordination sphere, while for complex 1, only minor conformational changes were expected. 1H and 13C NMR data for the 15N-labelled complex 2 were acquired and fully assigned in order to study the influence of p-electron density of the benzyl group to the long-range 13C?15N and 13C?13C spin?spin interactions.
eng Two new Ni(II) Schiff base complexes: X-ray absolute structure determination, synthesis of a 15N-labelled complex and full assignment of its 1H NMR and 13C NMR spektra. The Ni(II) complex of the Schiff base of (S)-N-(2-benzoyl-4-chlorophenyl)-1-benzylpyrrolidine-2-carboxamide and glycine (1) [GKCl] and the hemihydrate of the Ni(II) complex of the Schiff base of (S)-N-(2-benzoylphenyl)-1-benzylpyrrolidine-2-carboxamide and 2-aminoisobutiric acid (2) [Me2GK] were prepared and their absolute structures determined. The conformations of the complexes and their hydrogen bonding are discussed in detail. In complex 2, the repulsion between the benzyl group and an equatorial methyl group should affect the conformation of the benzyl group, distribution of the p-electron density in this group and distortion of the internal coordination sphere, while for complex 1, only minor conformational changes were expected. 1H and 13C NMR data for the 15N-labelled complex 2 were acquired and fully assigned in order to study the influence of p-electron density of the benzyl group to the long-range 13C?15N and 13C?13C spin?spin interactions. Complexes; Crystal structure; NMR spectra; Spin?spin interactions

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