Hydrogen Bond Engineering Visualized by Picometer-Level Distortion of Planar Porphyrin Isomers

Daiki Koga, Toshikazu Ono, Hyuga Shinjo, Yoshio Hisaeda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Directly investigating hydrogen bond (HB) dynamics in molecular materials is a challenging task. Here, we report a set of porphyrin isomers, porphycenes, that visualize slight changes on the order of picometers in the intramolecular HB dynamics. Intramolecular HBs of porphycenes were regulated by the systematic modification at meso positions with methyl (Me), cyclopentyl (Cy5), and cyclohexyl (Cy6) moieties. Notably, the quantum yields varied from 35 to 0.04% in chloroform, depending on a slight distortion in the porphycene framework. SC-XRD, XPS, and NMR clearly revealed that the Me and Cy6 moieties increased the nonradiative deactivation by strengthening the intramolecular NH⋯N HBs whereas Cy5 retained their photoluminescence properties. This is the first example of how the distortion of planar porphyrinoids at the picometer level along with the strength of the intramolecular NH⋯N HBs can drastically affect their optical properties. The results revealed new avenues of HB engineering based on porphyrinoids.

Original languageEnglish
Pages (from-to)10429-10436
Number of pages8
JournalJournal of Physical Chemistry Letters
Issue number42
Publication statusPublished - Oct 28 2021

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry


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