2.Therefore, compared to its free form, [Ni(phen)(H2O)4]2+ cations presented a hyperchromism effect due to the decrease in π-π interactions between phen ligands, although these cations might be dimerized or oligomerized through π stacking in solution.
The phen ligand`s aromatic surface area with relatively small size could not meet the requirement of insertion into the base pairs of DNA, which might be the main reason.
Ssince the decrease in π-π interactions between phen ligands of [Ni(phen)(H2O)4]2+ cations with respective to its free form, which could be dimerized or oligomerized through π stacking in solution,a hyperchromism effect was found.
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