Methyllead(IV) Derivatives Stabilized by DAPTSC 2– : Synthesis and Structures of New Diorganolead(IV) Complexes

Autor: María S. García-Tasende, Agustín Sánchez, José S. Casas, Eduardo E. Castellano, José Sordo, Javier Ellena, María J. Vidarte, Facundo Namor
Rok vydání: 2007
Předmět:
Zdroj: European Journal of Inorganic Chemistry. 2007:3742-3750
ISSN: 1099-0682
1434-1948
Popis: The reaction of the bis(thiosemicarbazone) of dimethyl pyridine-2,6-diyl diketone, H 2 DAPTSC, with PbMe 2 (OAC) 2 , PbMePh(OAc) 2 or PbPh 2 (OAc) 2 in MeOH afforded the complexes [PbMe 2 (DAPTSC)], [PbMePh(DAPTSC)] or [PbPh 2 -(DAPTSC)] (in the first two cases together with [Pb(DAPTSC)]). X-ray crystallography of the Pb(IV) complexes showed that the metal has a pentagonal bipyramidal coordination sphere. The N 3 ,S 2 -bound DAPTSC 2- anion occupied the equatorial plane and the organic groups were in the apical positions. These compounds retain the same coordination mode in DMSO solution. DAPTSC 2- is also N 3 ,S 2 -bound in [Pb(DAPTSC)], a complex with a stereochemically active Pb II lone pair. The reaction of PbPh 2 Cl 2 with H 2 DAPTSC, also in methanol at room temperature, afforded [PbPh2(H2DAPTSC)]2[PbPh2Cl 4 ]Cl 2 ·6CH 3 OH. X-ray crystallography of this centrosymmetric complex showed it to consist of two [PbPh 2 (H 2 DAPTSC)] 2+ cations of similar structure to the neutral [PbR 2 (DAPTSC)] complexes, together with a trans-octahedral [PbPh 2 Cl 4 ] 2- anion and two Cl - anions. This compound decomposes in DMSO solution, probably evolving to H 2 DAPTSC and PbPh 2 Cl 2 (DMSO) n . In order to evaluate the changes undergone by H 2 DAPTSC under metallation, the X-ray structure of the free molecule was also determined.
Databáze: OpenAIRE
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