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The red chem iluminescence (CL) of coordinatively unsaturated surface chromium(II) compounds in their reaction with O 2  has been studied at various reactivities of the products and various reaction temperatures. With compounds of high reactivity, two CL’s were observed: the first - spectrally unstructured - appears at T ≧ -130 °C, the second - being more intense and spectrally well structure - at T ≧ -90 °C. In course of both these CL’s O 2  is released. - Below -130 °C, oxidation takes place without any luminescence. On heating of the reaction product in

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Oberflächenverbindungen von Übergangsmetallen, XXVII [1] Lumineszenzerscheinungen an Oberflächenverbindungen des Chroms auf Silicagel/Surface Compounds of Transition Metals, XXVII [1] Luminescence Phenomena of Chromium Surface Compounds on Silicagel Supports