Abstract
The adducts [Zn(tmu)2X2](X = Cl, Br, or I), [Cd(tmu)2I2], and [M(tmu)X2](M = Cd or Hg and X = Cl or Br) have been characterized. The shift of the CO stretching vibration to low frequency indicated that tetramethylurea (tmu) is oxygen bonded to the metals. The standard enthalpy values (ΔHR⊖) for the reactions MX2(s)+n tmu(I)→[M(tmu)nX2](s) were determined by means of solution calorimetry. The values of standard enthalpy of formation (ΔHf⊖) of the above adducts in kJ mol–1 were: –1 006 (ZnCl2), –926 (ZnBr2), –844 (ZnI2), –690 (CdCl2), –602 (CdBr2), –775 (Cdl2), –515 (HgCl2), and –454 (HgBr2). The standard enthalpy of vaporization of tmu (ΔHv⊖= 51.12 ± 0.73 kJ mol–1) was obtained from vapour-pressure measurements. The values of the standard enthalpy of the reactions: MX2(s)+n tmu(g)→[M(tmu)nX2](s), MX2(g)+n tmu(g)→[M(tmu)nX2](s), and MX2(g)+n tmu(g)→[M(tmu)nX2](g) were also determined.
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