| abstract |
Use of a charge transfer complex of at least two different size metallic atomic quantum clusters (AQC), Mn and M'n ', of general formula (I): Mn + M'n‾ - (I), where the metals M and M ', of the metallic AQCs are the same or different metals, Mn, is the minor AQC that is present in its oxidized form, Mn +, M'n', is the highest AQC that is present in its reduced form, M'n‾ -, Mn + and M'n‾ - are linked by electrostatic interactions, n and n 'are respectively the numbers of metal atoms of M and M', and n is less than n 'as a marker for a document, article or element of security. |