Interwoven
Molecular Chains Obtained by Ionic Self-Assembly of Two Iron(III)
Porphyrins with Opposite and Mismatched Charges
Posted on 2019-09-08 - 17:03
We
report ionic self-assembly of positively charged FeIII meso-tetra(N-methyl-4-pyridyl) porphyrin
(FeIIINMePyP) with negatively charged FeIII meso-tetra(4-sulfonatophenyl) porphyrin (FeIIITPPS4), leading to the formation of flower-like nanostructures
composed of unprecedented three-dimensional (3D) entangled chains
of porphyrin dimers. Molecular dynamics (MD) simulations show that
the 3D entanglement of porphyrin chains closely correlates to mismatched
charges present in porphyrin dimers like [FeIII(H2O)2NMePyP]5+/[FeIII(H2O)2TPPS4]3– that requires
extra interactions or entanglement with neighboring ones to achieve
electric neutrality. Interestingly, the interwoven chains bring in
excellent thermal stability as evidenced by well maintenance of the
flower-like morphology after pyrolysis at 775 °C in argon, which
is in good agreement of high-temperature MD simulations. Meanwhile,
heat treatment of the flower-like porphyrin nanostructure leads to
the formation of a non-noble metal electrocatalyst (NNME) with largely
inherited morphology. This exemplifies a new approach by combining
ionic self-assembly with subsequent pyrolysis for the synthesis of
NNMEs with desired control over the morphology of template-free NNMEs
that has rarely been achieved prior to this study. Furthermore, our
electrocatalyst exhibits excellent activity and durability toward
oxygen reduction reaction as well as much better methanol tolerance
compared with commercial Pt/C in alkaline solutions.
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Xie, Yan; Zhong, Qinglu; Lv, Yang; Li, Jia; Hao, Zhiqiang; Tang, Chizhou; et al. (2019). Interwoven
Molecular Chains Obtained by Ionic Self-Assembly of Two Iron(III)
Porphyrins with Opposite and Mismatched Charges. ACS Publications. Collection. https://doi.org/10.1021/acsami.9b07460
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AUTHORS (14)
YX
Yan Xie
QZ
Qinglu Zhong
YL
Yang Lv
JL
Jia Li
ZH
Zhiqiang Hao
CT
Chizhou Tang
XW
Xuming Wei
YS
Yang Su
JH
Jiahui Huang
AW
Anjie Wang
XG
Xinwen Guo
JW
Junhu Wang
GL
Guohui Li
YS
Yujiang Song