The invention relates to half-sandwich transition metal complexes with general formula
(I), (wherein in Me is a transition metal ion selected from the group consisting of
Ru, Os, Rh, Ir, Pd and Pt, preferably selected from Ru, Os, Rh, Ir, X is a halogen
selected from the group consisting of Cl, Br and I, preferably Cl,Ar is a capping
mol. having a Cs or C6 aromatic ring substituted with one or more, preferably one
to five or one to six straight or branched chain C1-C6 alkyl, preferably C1-C3 alkyl,
resp.); and uses thereof, in particular in neo-plastic diseas or as antifungal agent.