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Supramolecular orientation of conjugated porphyrin oligomers in stretched polymers
Author(s) -
Anderson Harry L.
Publication year - 1994
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19940061104
Subject(s) - porphyrin , materials science , supramolecular chemistry , conjugated system , polymer , dimer , supramolecular polymers , perpendicular , dichroism , circular dichroism , crystallography , polymer chemistry , photochemistry , optics , organic chemistry , chemistry , composite material , crystal structure , geometry , mathematics , physics
Conjugated porphyrin oligomers show strong optical dichroism when oriented in a stretched polymer matrix. It is shown that the zinc porphyrin polymer (∼10 repeat units) aligns, as expected, with its backbone in the stretch direction, whereas the dimer orients with its molecular plane perpendicular to the stretch. This anomalous behavior is explained as being due to the formation of supramolecular stacks that orient as single units.