| Publication Type |
Journal Article |
| Title |
Self-organization of a sulfonamido-porphyrin in Langmuir monolayers and Langmuir-Blodgett films |
| Authors |
DM Togashi RIS Romao Amélia Gonçalves da Silva AJFN Sobral Sílvia M. B. Costa |
| Groups |
MET |
| Journal |
PHYSICAL CHEMISTRY CHEMICAL PHYSICS |
| Year |
2005 |
| Month |
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|
| Volume |
7 |
| Number |
22 |
| Pages |
3874-3883 |
| Abstract |
Langmuir monolayers (LM) and Langmuir-Blodgett (LB) films of pure lipophilic meso-tetra (4-dodecylaminosulfophenyl) porphyrin (PC12) and mixed with the anionic surfactant sodium hexadecylsulfate (SHS) were studied. The molecular packing and structure of PC12 and PC12-4SHS with variable surface pressure were investigated by surface pressure-area measurements, steady-state absorption, fluorescence emission and anisotropy, as well as by fluorescence lifetime imaging microscopy (FLIM). At low surface pressure, the porphyrin molecules are organized with the rings tilted on the water surface whereas at high surface pressure the porphyrin rings achieve a more perpendicular arrangement. Using the FLIM images a gradual change of aggregates into large islands is observed. Different patterns are observed in the pure PC12 multilayer films (n = 3 and 5) with ordered patches superimposed which are not observed in the PC12-4SHS multilayer LB films. |
| DOI |
http://dx.doi.org/10.1039/b506442b |
| ISBN |
|
| Publisher |
ROYAL SOC CHEMISTRY |
| Book Title |
|
| ISSN |
1463-9076 |
| EISSN |
|
| Conference Name |
|
| Bibtex ID |
ISI:000232946700014 |
| Observations |
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