Mass-spectrometric study of (indium + chlorine)(g) Enthalpies of formation of InCl(g), In2Cl2(g), In2Cl4(g), InCl3(g), and In2Cl6(g)

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Abstract

The gaseous phase in equilibrium with InCl(s or l), InCl2(s or l), or InCl3(s) was analysed by the Knudsen-cell mass-spectrometric method. InCl3(g) and In2Cl6(g) are the main species vaporizing from InCl3(s); InCl(g), In2Cl2(g), In2Cl4(g), and InCl3(g) from InCl(s or l); and In2Cl4(g), InCl3(g), InCl(g), In2Cl6(g), and In2Cl2(g) from InCl2(s). The gas-phase analysis was performed by studying the ionization-efficiency curves and ionic-intensity ratios as a function of the temperature of vaporization and chemical composition in (indium + chlorine) for every InxCly+ ion (x = 1, 2 and y = 0 to 5). Enthalpies of formation were deduced from vaporization and gas-phase equilibria: ΔfHmo(InCl3, g, 298.15 K) = −(375.7 ± 5.0) kJ · mol−1, ΔfHmo(In2Cl6, g, 298.15 K) = −(883.7 ± 10.0) kJ · mol−1, ΔfHmo(InCl, g, 298.15 K) = −(68.2 ± 4.6) kJ · mol−1, ΔfHmo(In2Cl4, g, 298.15 K) = −(573.2 ± 12.6) kJ · mol−1. A lower bound was calculated for InCl2(g): ΔfHmo(InCl2, g, 298.15 K) ⩾ −201 kJ · mol−1.

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