Preparation and structural studies on the tBu2 Sn(IV) complexes with aromatic mono- and dicarboxylic acids containing hetero {N} donor atom

Attila Szorcsik, László Nagy, Andrea Deák, Michelangelo Scopelliti, Zoltán A. Fekete, Ágota Császár, Claudia Pellerito, Lorenzo Pellerito

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37 Citations (Scopus)

Abstract

Nine complexes of t Bu2 Sn(IV)2+ were obtained in the solid state with ligands containing -COOH group(s) and aromatic {N} donor atom. The binding sites of the ligands were identified by FT-IR spectroscopic measurements. It was found that in most cases the -COO- groups are co-ordinated in monodentate manner. Nevertheless, in some of our complexes, the -COO- group forms bridges between two central {Sn} atoms resulting in the formation of an oligomeric structure, a motif that is characteristic only to the nicotinate compound. These pieces of information and the rationalisation of the experimental 119Sn Mössbauer nuclear quadrupole splittings, Δ, - according to the point charge model formalism - support the formation of octahedral (O h ) or trigonal bipyramidal (TBP) molecular structures. The X-ray diffraction analysis of one complex obtained as single crystal revealed the distortion of the TBP geometry towards square pyramidal (SP) one. This was rationalised by PM3 molecular modelling of the tBu2 Sn(pdc) complex. In the asymmetric unit, the two chemically similar but symmetry independent molecules form pseudo-dimers, in which the Sn...Sn separation amounts to ca. 6.4 Å. The crystal lattice is stabilised by C-H...O hydrogen bonding between individual molecules.

Original languageEnglish
Pages (from-to)2762-2769
Number of pages8
JournalJournal of Organometallic Chemistry
Volume689
Issue number17
DOIs
Publication statusPublished - Sep 1 2004

Keywords

  • FT-IR
  • Molecular modelling
  • Mössbauer spectroscopy
  • Organotin(IV)
  • X-ray diffraction

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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