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Stacking Control by Molecular Symmetry of Sterically Protected Phthalocyanines.


ABSTRACT: The synthesis and characterization of two phthalocyanine (Pc) structural isomers, 1 and 2, in which four 2,6-di(hexyloxy)phenyl units were attached directly to the 1,8,15,22- or 1,4,15,18-positions of the Pc rings, are described. Both Pcs 1 and 2 exhibited low melting points, i.e., 120 and 130 °C respectively, due to the reduction in intermolecular ?-? interaction among the Pc rings caused by the steric hindrance of 2,6-dihexyloxybenzene units. The thermal behaviors were investigated with temperature-controlled polarizing optical microscopy, differential scanning calorimetry, powder X-ray diffraction, and absorption spectral analyses. Pc 1, having C4h molecular symmetry, organized into a lamellar structure containing lateral assemblies of Pc rings. In contrast, the other Pc 2 revealed the formation of metastable crystalline phases, including disordered stacks of Pcs due to rapid cooling from a melted liquid.

SUBMITTER: Kudo R 

PROVIDER: S-EPMC7730234 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Stacking Control by Molecular Symmetry of Sterically Protected Phthalocyanines.

Kudo Ryota R   Sonobe Masahiro M   Chino Yoshiaki Y   Kitazawa Yu Y   Kimura Mutsumi M  

Molecules (Basel, Switzerland) 20201126 23


The synthesis and characterization of two phthalocyanine (Pc) structural isomers, <b>1</b> and <b>2</b>, in which four 2,6-di(hexyloxy)phenyl units were attached directly to the 1,8,15,22- or 1,4,15,18-positions of the Pc rings, are described. Both Pcs <b>1</b> and <b>2</b> exhibited low melting points, i.e., 120 and 130 °C respectively, due to the reduction in intermolecular π-π interaction among the Pc rings caused by the steric hindrance of 2,6-dihexyloxybenzene units. The thermal behaviors w  ...[more]

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