“…There is in fact a small increase in the relative viscosity of DNA by increasing the concentration of the Fe(Salen) þ complex. It has been reported [38][39][40][41][42][43] that a compound binding to DNA without intercalation, induces only small changes in the viscosity of DNA, while drastic increments of the viscosity were observed in cases of ascertained DNA intercalation by chemicals. Moreover, the results obtained show that the observed small linear increase of the relative viscosity of the solution, with the increase of the Fe(Salen)Cl concentration, is essentially attributable to the addition of the methanol solvent [44] in which Fe(Salen)Cl is dissolved.…”