Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 27, Pages 9763-9772Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5047445
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Funding
- EPSRC (UK)
- EPSRC [EP/J009377/1, EP/K039547/1]
- ILL
- Italian FIRB Project of the Italian MIUR New Challenges in Molecular Nanomagnetism: From Spin Dynamics to Quantum-Information Processing [RBFR12RPD1]
- EPSRC [EP/J009377/1, EP/D050782/1, EP/L018470/1, EP/K039547/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L018470/1, EP/D050782/1, EP/J009377/1, EP/K039547/1] Funding Source: researchfish
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Compounds of general formula [Cr7MF3(Etglu)-((O2CBu)-Bu-t)(15)(Phpy)] [H(5)Etglu = N-ethyl-n-glucamine; Phpy = 4-phenylpyridine; M = Zn (1), Mn (2), Ni (3)] have been prepared. The structures contain an irregular octagon of metal sites formed around the penta-deprotonated Etglu(5-) ligand; the chirality of N-ethyl-n-glucamine is retained in the final product. The seven Cr-III sites have a range of coordination environments, and the divalent metal site is crystallographically identified and has a Phpy ligand attached to it. By using complementary experimental techniques, including magnetization and specific heat measurements, inelastic neutron scattering, and electron paramagnetic resonance spectroscopy, we have investigated the magnetic features of this family of {Cr7M} rings. Microscopic parameters of the spin Hamiltonian have been determined as a result of best fits of the different experimental data, allowing a direct comparison with corresponding parameters found in the parent compounds. We examine whether these parameters can be transferred between compounds and compare them with those of an earlier family of heterometallic rings.
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