The reaction heats and PM5 semiempirical studies of complexes formed between silicon podand and LiC cations

The complexation reaction of LiC cations by silicon podands (1–12) was studied by calorimetric and PM5 semiempirical methods. Both methods provide evidence for formation of the respective complexes with LiC cations of different stoichiometry. For compounds 1, 2, 4, 6 and 10 only formation of 1:1 complexes were observed whereas for compounds with longer oxaalkyl chains the formation of 1:x (xO1) complexes have been found. The structures of the complexes are visualised and discussed. q 2005 Elsevier B.V. All rights reserved