The results reported below are based on CdSe QDs
with the first absorption maximum at 574 nm, and a maximum
emission peak at 603 nm with excitation at 350 nm, although
similar results were obtained with QDs of other sizes (colours).
The size of the nanocrystal was estimated to be 3.64 nm from
the 574 nm first absorption peak.13 The QDs were dissolved in
chloroform and mixed with 1:1 mixtures of bipy and MCl2
(M = Fe, Zn, Cu, Co and Ni) in chloroform.