Solid state synthesis, characterization and thermogravimetric study of theadducts CoCl2 center dot 6L (L = ethyleneurea, propyleneurea and ethylenethiourea)

The title compounds were synthesized by using an alternative solid state ro ute, and characterized by elemental analysis, infrared spectroscopy and the rmogravimetry, The IR data are in agreement with a coordination through oxy gen for ethyleneurea (EU) and propyleneurea (PU) and through nitrogen for e thylenethiourea (ETU). EU, PU and ETU adducts exhibit two mass loss steps, suggesting that the coordination positions are not equivalent for all adduc ts, and that there are two ligand molecules closer to the metal cation. Thi s hypothesis is supported by quantum chemical (density functional, DF) calc ulations. The observed thermal stability sequence is ETU > PU > EU. (C) 200 1 Elsevier Science B.V. All rights reserved.