Issue 44, 2017

Synthesis, characterization and magnetic properties of head-to-head stacked vanadocenes

Abstract

In order to design magnetically active molecular materials, it is desirable to arrange paramagnetic molecules in one dimension, which may lead to a molecular bar magnet. For this purpose, vanadocenyl units with three unpaired electrons each can be stacked in a head-to-head fashion. The target compound in this work is 1,8-bisvanadocenyl naphthalene, where the naphthalene backbone serves as a clamp keeping two vanadocene units together. The target compound in this work is obtained through the reaction of the disodium salt of 1,8-biscyclopentadiendiylnaphthalene with the cyclopentadienyl vanadium (CpV) transfer reagent [V(μ2-Cl)(η5-Cp)(thf)]2. The 1,8-bisvanadocenyl naphthalene is fully characterized. In addition, variable temperature 1H NMR spectroscopy, X-ray structure analysis, magnetic measurements and DFT calculations have been performed. In both experiment and theory, a weak antiferromagnetic coupling between the spin centers is found, with the spin highly localized on the V(II) ions.

Graphical abstract: Synthesis, characterization and magnetic properties of head-to-head stacked vanadocenes

Supplementary files

Article information

Article type
Paper
Submitted
21 Aug 2017
Accepted
13 Oct 2017
First published
18 Oct 2017

Dalton Trans., 2017,46, 15494-15502

Synthesis, characterization and magnetic properties of head-to-head stacked vanadocenes

S. Puhl, T. Steenbock, R. Harms, C. Herrmann and J. Heck, Dalton Trans., 2017, 46, 15494 DOI: 10.1039/C7DT03101G

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