Abstract
Organometallic materials have become subject of intensive research on distinct technological applications. The Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) techniques have proven to be suitable to address challenges inherent to organic devices, in which the film properties can be tuned at molecular level. Here, we report on the supramolecular arrangement of zinc(II)-protoporphyrin(IX) dimethyl ester (ZnPPIX-DME) using the Langmuir, LB and LS techniques, leading to nanostructured films. The π-A isotherms showed that π-π stacking interaction among ZnPPIX-DME molecules takes place at the air/water interface, favoring the formation of Langmuir films closely packed. The controlled growth of the LB and LS films was monitored via UV-Vis absorption spectroscopy, with the thickness per monolayer within 1.3 and 1.7 nm. The homogeneous topography found at microscale is no longer preserved at nanoscale, which is found rougher according to AFM data. The FTIR indicated that the ZnPPIX-DME is isotropically arranged on both LB and LS films.
Highlights
Porphyrins are a widely investigated class of high conjugated heterocycles[1] in which four pyrrole rings are linked to each other in cyclic form through meso-methine bridges
We have demonstrated the possibility of growing LB and LS multilayer films containing ZnPPIX-DME
Borovkov et al.[9] and Valli et al.[6] observed the same phase transition working with Langmuir films of bis(zinc porphyrin) and zinc porphyrin, respectively
Summary
Porphyrins are a widely investigated class of high conjugated heterocycles[1] in which four pyrrole rings are linked to each other in cyclic form through meso-methine bridges When these molecules contain metals linked to their core structure, they are called metalloporphyrins and form complexes such as heme and chlorophylls[2]. Most applications involving porphyrins and their derivatives are related to devices such as catalysts[16,17,18] and sensors[19,20,21,22,23,24] It is essential the improvement and the development of techniques to obtain porphyrin forming supramolecular structures[25]. Fourier transform infrared (FTIR) absorption spectroscopy in reflection and transmission modes was applied to verify a possible anisotropy in terms of molecular organization of ZnPPIX-DME forming LB and LS films
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