| 초록 |
Protoporphyrin (PP) is an organic compound which is responsible for transporting O2 and CO2 by complexation with ferrous iron in the biological system. Besides its intrinsic function, PP composes a π rich conjugated system with a planar ring structure. Due to the physico-chemical properties of PP, it shows a specific molecular interaction at the interface of the planar ring, such as the metal coordination. These molecular interactions are based on the π-interactions. PP has been utilized as a building block of surface modification, catalysis, and supramolecular assembly. Thus, in-depth study in the π-interactions of the PP will give a new insight to its further applications. In this study, we directly measured the adhesion force between the PP with and without the bound Fe2+ using a surface forces apparatus (SFA). The measured adhesion force showed the strongest without Fe2+ due to the π-π stacking (Fad~4.6 mN/m) and decreased as increase of Fe2+ by the metal coordination complex. |
