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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences


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1865-7117
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Volume 64, Issue 11-12

Issues

Silicon(IV) Chelates of an (ONN')-Tridentate Pyrrole-2-Carbaldimine Ligand: Syntheses, Structures and UV/Vis Properties

Daniela Gerlach
  • Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Straße 29, 09596 Freiberg, Germany
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/ Andreas W. Ehlers
  • Department of Chemistry, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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/ Koop Lammertsma
  • Department of Chemistry, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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/ Jörg Wagler
  • Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Straße 29, 09596 Freiberg, Germany
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-2009-11-1242

The tridentate (ONN_)-chelator properties of the pyrrole-2-(o-hydroxyphenyl)carbaldimine dianion (L2−) were explored for the neutral penta-coordinate diorganosilicon complexes LSiRR' (R,R' = Ph, Ph; Ph, Me; Ph, tBu) where the ligand L occupies the ax-eq-ax sites in a distorted trigonalbipyramidal arrangement arround the silicon atom, and for the neutral hexa-coordinate L2Si, that has a mer-coordination. Single-crystal X-ray diffraction analyses show an almost planar ligand backbone with a Si-N bond to the imine group that is shorter in hexa-coordinate L2Si than in pentacoordinate LSiRR'. In sharp contrast to the almost colorless neutral ligand LH2, both complexes show pronounced UV/Vis absorptions in the red-brown region that originate from HOMO- LUMO and HOMO-1 -LUMO transitions, and that are due to intra-ligand π-π transitions from the N-ooxyphenylimine towards the imine moiety

Graphical Abstract

Silicon(IV) Chelates of an (ONN')-Tridentate Pyrrole-2-Carbaldimine Ligand: Syntheses, Structures and UV/Vis Properties

Silicon(IV) Chelates of an (ONN')-Tridentate Pyrrole-2-Carbaldimine Ligand: Syntheses, Structures and UV/Vis Properties

Keywords : Chelate; Time-dependent DFT; Hypercoordination; Pyrrole; Schiff Base; UV/Vis

About the article

Published Online: 2014-06-02

Published in Print: 2009-12-01


Citation Information: Zeitschrift für Naturforschung B, Volume 64, Issue 11-12, Pages 1571–1579, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2009-11-1242.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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