Long before molecular magnetism started, the advent of magnetic
molecular rings was announce in a prophetic publication (Björn
Benny & Agnetha Frida, Ring, Ring, Polar Music, 1973).
In the early days only even-membered rings could be synthesized,
odd rings were covered by strange theoretical prophecies (JMMM
220 (2000) 227; Phys. Rev. B 68 (2003) 054422).|
Ring, ring, why don't you give me a call?
Ring, ring, the happiest sound of them all
Ring, ring, I stare at the phone on the wall
And I sit all alone impatiently
Won't you please understand the need in me
So, ring, ring, why don't you make an odd ring?
2016: here we go - an odd homometallic chromium ring is
reported, which is the first regular Cr9
antiferromagnetic ring. Its electronic relaxation dynamics was
probed by 1H-NMR, which allows to determine the spin-phonon
coupling strength. At very low temperatures, the relaxation is
characterized by a single dominating Arrhenius-type relaxation
process, whereas several relevant processes emerge at higher
E. Garlatti, S. Bordignon, S. Carretta, G. Allodi, G. Amoretti,
R. De Renzi, A. Lascialfari, Y. Furukawa, G. A. Timco,
R. Woolfson, R. E. P. Winpenny, and P. Santini,
Relaxation dynamics in the frustrated Cr9 antiferromagnetic ring probed by NMR,
Phys. Rev. B 93, 024424 (2016)
More stories on rings (Tell me, are we really through?):
McInnes, E. J. L., Timco, G. A., Whitehead, G. F. S. and
Winpenny, R. E. P.
Heterometallic Rings: Their Physics and use as Supramolecular Building Blocks,
Angew. Chem. Int. Ed., 54, 14244-14269 (2015)
Alternative interpretation (R.W.: The ring was made by Alberich?!):