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Spectroscopic and electrochemical studies on dinuclear mixed Ni(II)-chelates

Spektrokopische und elektrochemische Untersuchungen an zweikernigen gemischten Ni(II)-Chelaten

  • Anorganische Und Physikalische Chemie
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

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Summary

Solvatochromic dinuclear mixed Ni(II)-complexes with one 1,2-diacetyl-1,2-dibenzoyl-ethanate (dadb 2−) and two tetramethylethylenediamine (tmen) ligands have been prepared and characterized. The tetraphenylborate is orange with molecules in bis-square-planar configuration and the nitrate is green with molecules in a bis-octahedral form. They have been investigated by UV, Vis, IR, and Far-IR spectroscopy as well as by electrochemical and magnetochemical methods. In strong donor solvents the nitrate ligands are replaced by solvent molecules. In weak donor solvents the anion-dependent equilibrium between the bis-planar, the bis-octahedral and an intermediate planar-octahedral form was investigated.

Zusammenfassung

Solvatochrome zweikernige Ni(II)-Komplexe mit einem 1,2-Diacetyl-1,2-dibenzoylethanate (dadb 2−) und zwei Tetramethylethylendiamin (tmen)-Liganden wurden hergestellt und charakterisiert. Das Tetraphenylborat ist orangegelb und enthält Komplexionen in bis-quadratisch-planarer Anordnung. Das Nitrat ist grün mit Molekülen in bis-oktaedrischer Form. Die Untersuchungen erfolgten mit Hilfe der Spektroskopie im UV-, im sichtbaren, im IR- und im Far-IR-Bereich sowie elektrochemischer und magnetischer Methoden. In starken Donor-Lösungsmitteln sind die Nitratliganden durch Solvens-Moleküle ersetzt. In schwachen Donor-Lösungsmitteln wurde das von den Anionen abhängige Gleichgewicht zwischen der bis-planaren, der bis-oktaedrischen sowie der intermediären planar-oktaedrischen Form untersucht.

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Dedicated to Professor Dr. Edwin Hengge on occasion of his 60th birthday

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Linert, W., Pouresmaeil, B., Gutmann, V. et al. Spectroscopic and electrochemical studies on dinuclear mixed Ni(II)-chelates. Monatsh Chem 121, 765–780 (1990). https://doi.org/10.1007/BF00808369

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  • DOI: https://doi.org/10.1007/BF00808369

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