Synthesis, structure and characterization of new stibocanes substituted with dithiophosphate ligands
作者:Patricia García y García、Patricia Martínez-Salas、Simón Hernández-Ortega、Perla Román-Bravo、Marcela López-Cardoso、María del Carmen Pérez-Redondo、Gabriela Vargas-Pineda、Ave María Cotero-Villegas、Raymundo Cea-Olivares
DOI:10.1016/j.poly.2012.02.001
日期:2012.4
Four new stibocanes substituted with cyclic dithiophosphate ligands O(CH2CH2S)(2)SbS2P(OCH2)(2)CEt2 (1), O(CH2CH2S)(2)SbS2P(OCH2)(2)C(Me)Pr (2), S(CH2CH2S)(2)SbS2P(OCH2)(2)CEt2 (3) and S(CH2CH2S)(2)SbS2P(OCH2)(2) C(Me)Pr (4) were prepared from the corresponding chloro oxa- and thia-stibocanes and the sodium salt of the dithiophosphoric acids 5,5-diethyl-(2-mercapto-2-thiono-1,3,2-dioxaphosphinane) and 5-methyl-5-propyl-(2-mercapto-2-thiono-1,3,2-dioxaphosphinane) in ethanol. The compounds obtained were characterized by IR, EI-MS and multinuclear NMR (H-1, C-13, P-31) spectroscopies. The single-crystal structures of 1 and 2 were determined which show the presence of three types of secondary bonding: i.e. strong Sb---O transannular interactions of 2.607(4) and 2.600(4) angstrom, respectively, anisobidentate coordination of the ligand (exocyclic chelation) average Sb---S distance 3.355 angstrom and intermolecular interactions that lead to supramolecular associations. The coordination geometry around antimony atom in both 1 and 2 can be described as Psi tricapped trigonal bipyramidal AB(4)CD(2)E. The eight membered ring presents a boat-chair conformation in both compounds and the 1,3,2-dioxaphosphinane ring has the chair conformation, with the stibocane in the axial position. (C) 2012 Elsevier Ltd. All rights reserved.