Enthalpies of formation of complexes [Ti(η-C5H5)2(N3)2] and [Ti(η-C5H5)2(NC8H6)2]

Abstract

The standard enthalpies of formation of the title crystalline solids at 298.15 K have been determined by reaction–solution calorimetry as ΔH_f^⊖{[Ti(η-C₅H₅)₂(N₃)₂], c}= 436.4 ± 10.4 kJ mol^–1 and ΔH_f^⊖{[Ti(η-C₅H₅)₂(NC₈H₆)₂], c}= 219.9 ± 12.0 kJ mol^–1. The titanium–nitrogen mean bond-enthalpy terms have been derived from the thermochemical data obtained, used together with extended-Hückel molecular-orbital calculations.