84804-33-1Relevant academic research and scientific papers
Synthesis and Crystal Structure of Some Tetramethylstibonium Hydrogendicarboxylates
Milewski-Mahrla, Beatrix,Schmidtbaur, Hubert
, p. 1393 - 1401 (2007/10/02)
Reactions of pentamethylantimony (CH3)5Sb with carboxylic acids in the molar ratio 1:2 afford one equivalent of methane and essentially quantitative yields of crystalline tetramethylstibonium hydrogendicarboxylates.Six new compounds of this series have been synthesized using benzoic, o-phthalic, salicylic, 4-ethoxy-salicylic, oxalic, and malic acid, and characterized by analytical and spectroscopic data.An ionic structure with strong hydrogen bonds in the anionic components is proposed.The crystal structures of the hydrogen-dibenzoate (1), hydrogen-ortho-phthalate (2) and 4-ethoxy-hydrogen-salicylate (3) were determined by single crystal X-ray diffraction.The compounds can be described as having ionic lattice with some donor-acceptor interactions between the stibonium centers and the carboxylates oxygen atoms.The anions are characterized by strong hydrogen bonds O***H***O.Thus, the (CH3)4Sb-tetrahedron in 1 is distorted by two benzoate oxygen atoms (at 304(2) and 340(2) pm).The cation in 2 is largely undistorted and the anion has a hydrogenphthalate hydrogen bond of d(O***H***O) = 232 pm.The cation-anion contact in 3 is as short as d(Sb-O) = 289 pm rendering the Sb atom pentacoordinate. - Key words: Pentamethylantimony, Tetramethylstibonium Salts, Hydrogendicaboxylates, Hydrogen Bonding, X-ray
