Huge splitting of dichroic absorption energies in ordered cyanine dye films

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Publication Date
DOI 10.1039/A808610I
Impact Factor 3.676
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Abstract

Molecular interactions in highly ordered films of the cyanine dye 1,7-bis(dimethylamino)heptamethine tetrafluoroborate were investigated by polarized UV/VIS spectroscopy. The films (80 nm) were prepared by a spherulitic crystallization process, in which both the arrangement of chromophores in the crystal lattice and the inclination of the crystal lattice in respect to the substrate could be varied. Seven different polymorphs were observed. The spectroscopic properties of the γ-form, having the largest splitting of the dichroic absorption energies of 12100 cm-1, were studied. This form exhibits three different crystal faces, showing quite different colors although the crystal structure is the same. The unusual absorption properties could be explained by way of superstructure–absorption relationships, derived from single crystals of this dye. The layer absorption is determined by strong excitonic interactions and by the directional dispersion of polaritons. The excitonic character of the absorption was proved by photobleaching of the crystal transitions by light of selected wavelength and polarization.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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