Preparation and structural studies on the tBu2Sn(IV) complexes with aromatic mono- and dicarboxylic acids containing hetero {N} donor atom

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RESEARCH PRODUCT

Preparation and structural studies on the tBu2Sn(IV) complexes with aromatic mono- and dicarboxylic acids containing hetero {N} donor atom

Andrea Deák ÁGota Császár Claudia Pellerito Zoltan A. Fekete Michelangelo Scopelliti Attila Szorcsik László Nagy Lorenzo Pellerito

subject

Denticity geometry X ray diffraction Crystal structure Organotin(IV)nicotinic acid derivative Biochemistry Inorganic Chemistry complex formation Materials Chemistry Molecule organotin compound controlled study Physical and Theoretical Chemistry infrared spectroscopy chemical binding hydrogen bond Hydrogen bond Chemistry Mössbauer spectroscopy binding site Organic Chemistry article Square pyramidal molecular geometry X-ray diffraction FT-IR tin derivative Trigonal bipyramidal molecular geometry Crystallography Octahedron dicarboxylic acid Settore CHIM/03 - Chimica Generale E Inorganica chemical structure Molecular modelling carboxylic acid synthesi molecular model chemical analysi Single crystal

description

Nine complexes of 'Bu2Sn(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 Sn-119 Mossbauer nuclear quadrupole splittings, Delta, - 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 'Bu2Sn(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 Angstrom. The crystal lattice is stabilised by C-H... O hydrogen bonding between individual molecules. (C) 2004 Elsevier B.V. All rights reserved.

year	journal	country	edition	language
2004-09-01

10.1016/j.jorganchem.2004.05.045 https://hdl.handle.net/10447/2262