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Supramolecular Assembly Formation in Monolayers of tert-Butyl Substituted Copper Phthalocyanine and Tetrabenzotriazaporphin |
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| Authors: | L A Valkova L S Shabyshev N Yu Borovkov L A Feigin F Rustichelli |
| Institution: | (1) Problem Laboratory of Liquid Crystals, Ivanovo State University, Ivanovo, Russia, Ermaka str., 39, Ivanovo, 153025, Russia;(2) Institute of Solutions Chemistry, Russian Academy of Sciences, Ivanovo, Russia;(3) Istituto di Scienze Fisiche Universitá degli Studi di, Ancona, Ancona, Italy |
| Abstract: | The effect is studied of the layer formation conditions on the molecular arrangement of copper tetra- tert-butyl phthalocyanine (CuPctBu4) and copper tetra- tert-butyl tetrabenzotriazaporphin (CuThptBu4) at the air–water interface. The decrease in initial surface concentration of these compounds is shown to affect the molecular orientation, as indicated by the increase in the area per molecule. The data are interpreted in terms of formation of CuPctBu4 and CuThptBu4 monolayers with a  face-on molecular arrangement when the initial surface concentration is sufficiently small (N less than 1.6 × 10–7 mole/m2 for CuPctBu4 and N less than 4 × 10–7 mole/m2 for CuThptBu4) and changes in the molecular orientation to edge-on when the N values are higher. It is emphasized that the edge-on orientation on the water surface is not only a molecular but a collective property of the azaporphyrine supramolecular assembly. |
| Keywords: | azaporphyrins monolayers supramolecular assembly Langmuir– Blodgett films |
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