Atomic force microscopic observation of the molecular orientation in ultrathin films of alkanoic acid-derivatized porphyrins on a mica surface.
The observation of the molecular orientation of alkanoic acid-derivatized porphyrins in ultrathin films deposited on mica was carried out by atomic force microscopy. It was observed that the tetraacid derivative 5, 10, 15, 20-tetra(N-10-carboxydecyl-pyridinium-4-yl) porphyrin was arranged as a monolayer with the porphyrin macrocycle oriented coplanar to the mica surface. On the other hand, the diacid derivative protoporphyrin IX Zn(II) formed a bilayer with the hydrophobic part inside and the hydrophilic part in the periphery. Therefore, in this case, the porphyrin macrocycle is roughly perpendicular to the mica surface.
Imae
Toyoko
T
Research Center for Materials Science, Faculty of Science, Nagoya University, Nagoya 464-8602, Japan.
Niwa
Tohru
T
Zhang
Zhijun
Z
D000538:Aluminum Silicates / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis*; D003460:Crystallization / Q000379:methods; D003461:Crystallography / Q000379:methods; D008422:Materials Testing / Q000379:methods; D018625:Microscopy, Atomic Force / Q000379:methods*; D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D011166:Porphyrins / Q000737:chemistry*; D013499:Surface Properties
D000538:Aluminum Silicates; D020099:Coated Materials, Biocompatible; D011166:Porphyrins; C011934:mica