Abstract
The new adducts MI3·L (M = Sb or Bi; L = N,N -dimethylthioacetamide (dmta) or N,N-dimethylthioformamide (dmtf), were isolated, characterized, and studied through reaction-solution calorimetry at the temperature 298.15 K: MI3(cr)+L(l, cr) = MI3·L(cr); ΔrHom(kJ·mol-1): SbI3·dmta, -10.58±0.14; SbI3·dmtf, -14.90±0.14; BiI3·dmta, -9.96±0.29; and BiI3·dmtf, -15.19±0.41. Using ΔrHom and the standard molar enthalpies of formation of ligands and triiodides, the standard molar enthalpies of formation of the crystalline thioamide adducts were calculated; their values for this sequence are: (-177.6, -131.3, -226.6, and -181.2) kJ·mol-1. The mean metal-sulphur bond enthalpies for the same sequence: (112, 117, 144, and 150) kJ·mol-1, were also calculated.
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