The influence of temperature on the oscillatory frequency of the hydrogen peroxide-iodate ion reaction is found to be two-sided: (i) the period length decreases with increasing temperature in most of the instances studied, (ii) or in some cases an opposite change is observed. A temperature-independent period length (temperature compensation) is also discovered experimentally in a rather wide temperature interval at a narrow concentration range of reactants both in a batch configuration and under flow conditions. A simple model was considered to simulate this behavior. Opposing effects of the composite reactions of the model on the calculated period length with changing temperature are shown to be responsible for temperature compensation or overcompensation.

Gallium(III) halides react with cerium(III), ytterbium(III), or dysprosium(III) halides in the presence of alkylated benzenes yielding mononuclear complexes of the general formula [Ln(η6‐arene)(GaX4)3]. The X‐ray structures of [Ce(C6H5Me)(GaCl4)3] (1), [Ce(p‐C6H4Me2)(GaCl4)3]·0.5(p‐C6H4Me2) (2), [Yb(C6H5Me)(GaCl4)3] (3), [Yb(p‐C6H4Me2)(GaCl4)3]·0.5(p‐C6H4Me2) (4), and [Dy(C6H5Me)(GaBr4)3] (5) were determined. Arene ligands in the cerium–toluene compound 1 can be substituted by polycyclic aromatic hydrocarbons (PAHs); the compounds [Ce(naphthalene)(GaCl4)3] (6) and [Ce(pyrene)(GaCl4)3]·0.5(pyrene) (7) have been isolated and structurally characterized. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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