Issue 45, 2008
From the journal:

Dalton Transactions

Supramolecular approach for solid state Brownian rotators

Tomoyuki Akutagawaab  and  Takayoshi Nakamura*ab  

* Corresponding authors

a Research Institute for Electronic Science, Hokkaido University, N20W10 kita-ku, Sapporo, Japan
E-mail: takuta@es.hokudai.ac.jp, tnaka@es.hokudai.ac.jp
Fax: +81 (0)11 706 9420
Tel: +81 (0)11 706 9417

b Graduate School of Environmental Science, Hokkaido University, N12W10 kita-ku, Sapporo, Japan

Abstract

Artificial molecular rotators were designed in an attempt to achieve unidirectional molecular rotation. Supramolecular assemblies of cations and crown ethers in the solid state were shown to form rotator structures, diverse in their rotational symmetry and frequency. The counter cation of [Ni(dmit)2]− anion, bearing one S = 1/2 spin, was used to couple molecular rotation to magnetic properties. Random rotation of [18]crown-6 molecules was first observed in the Cs+2([18]crown-6)3 supramolecule, where the rotational freedom of [18]crown-6 rotators was evidently coupled to the magnetic properties of [Ni(dmit)2]−π-dimer. In other cases, dual rotary motions of anilinium([18]crown-6) and rotator–stator assemblies of (adamantylammonium)(dibenzo[18]crown-6) were investigated as a means to control rotational symmetries and frequencies in the solid state. The supramolecular approach for construction of molecular rotator–stator assemblies in the solid state is a convenient approach to the design of molecular rotary functionality in [Ni(dmit)2]− salts.

Graphical abstract: Supramolecular approach for solid state Brownian rotators

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Article information

DOI
https://doi.org/10.1039/B808748B
Article type
Perspective
Submitted
23 May 2008
Accepted
29 Jul 2008
First published
09 Oct 2008

Dalton Trans., 2008, 6335-6345

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Supramolecular approach for solid state Brownian rotators

T. Akutagawa and T. Nakamura, Dalton Trans., 2008, 6335 DOI: 10.1039/B808748B

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