Standard heats of formation and M–C bond energy terms for some homoleptic transition metal alkyls MRn

Abstract

The heats of alcoholysis in isopropyl alcohol of the d⁰ Ti or Zr compounds MR₄(R = Me₃SiCH₂, Me₃CCH₂, or PhCH₂), M(NR′₂)₄(R′= Me or Et), and MCl₄(and some Hf analogues) have been measured, as well as the heats of solution in Pr¹OH of M(OPrⁱ)₄, RH, R′₂NH, or HCl; from these and subsidiary data standard heats of formation and thermochemical mean bond energy terms have been derived [M–X in kcal mol^–1: Ti–C_neopentyl,44; Ti–C,63; Ti–N, 81; Ti–O, 115; Zr–C_neopentyl, 54; Zr–C, 74; Zr–N, 90; Zr–O, 132; Hf–C_neopentyl, 58; Hf–N, 95; Hf–O, 137].