Intramolecularly coordinated organoantimony(III) carboxylates

The reactions of organoantimony chlorides (LSbCl2)-Sb-1,2 1 and 2 ([2,6-(ROCH2)(2)C6H3](-), R = Me; L-1 and R = t-Bu; L-2) with silver salts of selected carboxylic acids resulted to corresponding organoantimony carboxylates L-1,L-2 Sb(OOCR')(2), 1a-c (for L-1) and 2a-c (for L-2), where R'= CH3 for la, 2a; R' = CH=CH2 for 1b, 2b and R'= CF3 for 1c, 2c. All compounds were characterized by the help of elemental analysis, ESI-MS, H-1 and C-13 NMR spectroscopy. The solid state structure investigation using single crystal X-ray diffraction techniques (2a, c) and IR spectroscopy revealed significant differences in coordination mode of both O,C,O chelating ligand and carboxylic groups in this set of compounds. The structure of all compounds in solution of non-coordinating solvent (CDCl3) was determined by means of variable temperature H-1, C-13, F-19 NMR spectroscopy and IR spectroscopy. (c) 2007 Elsevier B.V. All rights reserved.