EXPERIMENTAL OVERVIEW
The procedure was split into three sections: (i) preparation of
CuI, (ii) synthesis of the clusters (Scheme 1), and (iii)
demonstration of luminescence thermochromism. Hardt’s
prodcedure1 was readily scaled down and modified so that
students could prepare their own CuI, starting with inexpensive
copper(II) sulfate. Commercial CuI can be used for a shorter
version of the experiment, starting with the synthesis of the
clusters (see the Supporting Information)