EPR and magnetic studies of a novel copper metal organic framework (STAM-I)

EPR and magnetic studies of a novel copper metal organic framework (STAM-I)

[Display omitted] ► New metal organic framework is synthesised. ► The copper paddle-wheel building unit of the MOF gives arise to an excited triplet state which is detectible by cw EPR. ► The copper in the dimer units are strongly coupled with an antiferromagnetic exchange coupling. The magnetic int...

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Bibliographic Details
Published in:Chemical physics letters 2012-08, Vol.544, p.17-21
Main Authors: EL Mkami, H., Mohideen, M.I.H., Pal, C., McKinlay, A., Scheimann, O., Morris, R.E.
Format: Article
Language:eng
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Summary:[Display omitted] ► New metal organic framework is synthesised. ► The copper paddle-wheel building unit of the MOF gives arise to an excited triplet state which is detectible by cw EPR. ► The copper in the dimer units are strongly coupled with an antiferromagnetic exchange coupling. The magnetic interaction between dinuclear copper (II) in a new copper carboxylate compound, STAM-1, has been investigated by means of EPR and SQUID measurements. The powder EPR spectra, measured at 9.80 and 34.5GHz and at different temperatures, show the typical lines of the triplet state (S=1), attributed to Cu2+–Cu2+ dimers, in addition of a temperature dependent central lines. The zero field splitting parameters obtained are |Dobs|=0.337cm−1 and E∼0. Magnetic susceptibility data, performed in the range 1.8–300K, shows a strong antiferromagnetic exchange coupling between the Cu2+ centers in the paddle-wheel units with the exchange coupling constant 2J=−334±4cm−1.
ISSN:0009-2614
1873-4448