The present paper studies the UV-VIS adsorption spectra of the M(X)HgI
(4)(M(n+) = Ag+, Cu+, Tl+, Pb2+, Cd2+ and X = 1.2) complex combination
s, specifying the electronic transition types. There is an agreement b
etween the absorption bands of some combinations of this type, known f
rom the literature, and those of the complex combinations prepared und
er this paper.