Adjusting Rotational Behavior of Molecular Rotors by a Rational Tuning of Molecular Structure

Hui Miao Li, Gui Ming Zhong, Shuqi Wu, Osamu Sato, Xiao Yan Zheng, Zi Shuo Yao, Jun Tao

Research output: Contribution to journalArticlepeer-review

Abstract

Many crystalline molecular rotors have been developed in the past decades. However, manipulating the rotational gesture that intrinsically controls the physical performance of materials remains a challenge. Herein, we report a series of crystalline rotors whose rotational gestures can be modulated by modifying the structures of molecular stators. In these dynamic crystals, the ox2- (ox2- = oxalate anion) behave as molecular rotators performing axial-free rotation in cavities composed of five complex cations, [MII(en)3]2+ (en = ethylenediamine). The structure of [MII(en)3]2+ that serves as a molecular stator can be tuned by varying the metal center with different ionic radii, consequently altering the chemical environment around the molecular rotator. Owing to the quasi-transverse isotropy of ox2- and multiple hydrogen-bond interactions around it, the molecular rotator exhibits unusual motional malleability, i.e., it can rotate either longitudinally in the compound of ZnII, or with a tilt angle of 42° in the compound of FeII, or even laterally in the compound of CdII. The atypical dynamic behavior demonstrated here provides a new chance for the development of exquisite crystalline molecular rotors with advanced tunable functionalities.

Original languageEnglish
Pages (from-to)8042-8048
Number of pages7
JournalInorganic chemistry
Volume60
Issue number11
DOIs
Publication statusPublished - Jun 7 2021

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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