Tese
Análise estrutural de complexos derivados de telúrio
Fecha
2011-03-18Registro en:
SANTOS, Sailer Santos dos. Structural analysis of tellurium based complexes. 2011. 153 f. Tese (Doutorado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2011.
Autor
Santos, Sailer Santos dos
Institución
Resumen
This work describes the synthesis and structural analysis of different kinds of
tellurium based compounds, depicting the preparation of zwitterions, coordination
polymers and also heteronuclear complexes, using 4-ditellurobispyridine (4) and N ,
N , N , N -tetraethyl-N,N -pyridine-2,6-dicarbonyl-bis(thiourea) (12) as starting
materials. These ligands are able to form complexes with tellurium allowing the
simultaneous coordination of transition metals, producing novel compounds. The
materials were characterized by single crystal X-ray diffraction, vibrational
spectroscopy and 1H and 125Te nuclear magnetic resonance (when applicable). The
methodology using the ligand 12 provided the preparation of three different classes
of compounds: complexes with inorganic tellurium, complexes with organic
derivatives of tellurium and tellurium based complexes with transition metals. The
later ones are the most interesting owing the selectivity of the ligand, that coordinates
to tellurium just with the softer site (sulfur atom), leaving the other donor atoms free
to coordinate to another metallic center.