Valkova Larissa A, Valli Ludovico, Casilli Serena, Giancane Gabriele, Borovkov Nicholas Yu, Sibrina Galina V, Glibin Alexandr S, Koifman Oscar I, Pisani Michela, Rustichelli Franco
Ivanovo State University, Ermak St. 39, Ivanovo, 153025, Russia.
Langmuir. 2008 May 6;24(9):4857-64. doi: 10.1021/la703585p. Epub 2008 Apr 8.
Aggregation behavior of unsubstituted copper porphyrazine (CuPaz) on the water surface was studied by analysis of compression curves, Brewster angle microscopy (BAM), and optical spectroscopy. The structure and stability of the CuPaz aqua aggregates in the floating layers are determined by hydration degree that depends on initial surface concentration and surface pressure. Langmuir-Schaefer (LS) films of CuPaz were prepared by deposition of the variously structured floating layers and studied by X-ray scattering technique and optical spectroscopy. Stable and labile structures were detected and compared with the floating CuPaz aqua aggregates. Conditions of formation of the stable four-stacked nanoaggregates in LS films were determined. A model comprising both nucleation of CuPaz on the water surface and structural transformations in the solid films is proposed.
