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

Daniela Gerlach, Jörg Wagler, Andreas W. Ehlers, Koop Lammertsma

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The tridentate (ONNN')-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 trigonal- bipyramidal 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-o- oxyphenylimine towards the imine moiety.

Original languageEnglish
Pages (from-to)1571-1579
Number of pages9
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Issue number11-12
Publication statusPublished - Dec 2009
Externally publishedYes


  • Chelate
  • Hypercoordination
  • Pyrrole
  • Schiff Base
  • Time-dependent DFT
  • UV/Vis

ASJC Scopus subject areas

  • General Chemistry


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