Diorganotin(IV) and triorganotin(IV complexes of meso tetra (4 sulfonatophenyl) porphine: do they bind DNA?

It was observed that organometallic porphyrin systems, where the Sn(IV) residue is in side chains, coordinated via sulphonatophenyl groups of porphyrin, show interesting and peculiar in vitro activity, in agreement with the anti-tumour activity of organotin complexes.