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Broad Hexagonal Columnar Mesophases Formation in Bioinspired Transition‐Metal Complexes of Simple Fatty Acid meta ‐Octaester Derivatives of meso ‐Tetraphenyl Porphyrins
Author(s) -
Wu Bin,
Chen Keyang,
Deng Yuchen,
Chen Jian,
Liu Chengjie,
Cheng Rongshi,
Chen Dongzhong
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404708
Subject(s) - mesophase , thermotropic crystal , small angle x ray scattering , crystallography , differential scanning calorimetry , columnar phase , porphyrin , hexagonal phase , materials science , phase (matter) , chemistry , organic chemistry , scattering , hexagonal crystal system , liquid crystalline , optics , thermodynamics , physics
Abstract A series of meta ‐substituted fatty acid octaester derivatives and their transition‐metal complexes of meso ‐ tetraphenyl porphyrins (TPP‐8OOCR, with R=C n −1 H 2 n −1 , n =8, 12, or 16) have been prepared through very simple synthesis protocols. The thermotropic phase behavior and the liquid crystalline (LC) organization structures of the synthesized porphyrin derivatives were systematically investigated by a combination of differential scanning calorimetry (DSC), polarized optical microscopy (POM), and variable‐temperature small‐angle X‐ray scattering/wide‐angle X‐ray scattering (SAXS/WAXS) techniques. The shorter octanoic acid ester substituted porphyrin (C8‐TPP) did not show liquid crystallinity and its metal porphyrins exhibited an uncommon columnar mesophase. The lauric acid octaester (C12‐TPP) and the palmitic acid octaester (C16‐TPP) series porphyrins generated hexagonal columnar mesophase Col h . Moreover, the metal porphyrins C12‐TPPM and C16‐TPPM with M=Zn, Cu, or Ni, exhibited well‐organized Col h mesophases of broad LC temperature ranges increasing in the order of TPPNi