Solvophobic versus Electrostatic Interactions Drive Spontaneous Adsorption of Porphyrins onto Inorganic Surfaces: A Full Noncovalent Approach
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- 作者：Alessandro D鈥橴rso ; Alessandro Di Mauro ; Alessandra Cunsolo ; Roberto Purrello ; Maria Elena Fragal脿
- 刊名：Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：August 29, 2013
- 年：2013
- 卷：117
- 期：34
- 页码：17659-17665
- 全文大小：379K
- 年卷期：v.117,no.34(August 29, 2013)
- ISSN：1932-7455
文摘
The successful transferring of a porphyrin complex assembly from a solution to a solid surface is important for an economical development of functional materials, biomaterials, and sensing devices. The understanding of the mechanisms and factors that drive spontaneous and stable deposition, in water, of porphyrins (and their complex species) onto inorganic surfaces paves the way for a straightforward and environmentally friendly noncovalent functionalization of solid surfaces. Here, we show that surface charge considerations need to be carefully considered if water-soluble porphyrin derivatives have to be successfully immobilized onto zinc oxide (ZnO) layers deposited on glass. In particular, it will be demonstrated that the electrostatics of the glass support has a central role in driving the layering of charged (anionic and cationic) porphyrin derivatives. Finally, our results underline the robustness and versatility of the noncovalently driven deposition鈥攊n terms of both reproducibility and stability of the porphyrin assemblies鈥攁nd shed light on the crucial role played by dispersion interactions, which (in our experimental conditions) prevent the more specific covalent interactions.