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New Silver(I) Coordination Polymer with Fe4 Single-Molecule Magnets as Long Spacer

1
Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
2
Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche (ISTM-CNR), via C. Golgi 19, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Magnetochemistry 2018, 4(4), 43; https://doi.org/10.3390/magnetochemistry4040043
Received: 11 May 2018 / Revised: 12 September 2018 / Accepted: 25 September 2018 / Published: 1 October 2018
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Abstract

In continuation of our work on supramolecular architectures of single-molecule magnets (SMMs) as a promising strategy in developing their magnetic performance, in this paper we report the synthesis and single crystal X-ray structure of the centered triangular tetrairon(III) SMM, [Fe4(PhpPy)2(dpm)6], Fe4 (Hdpm = dipivaloylmethane, H3PhpPy = 2-(hydroxymethyl)-2-(4-(pyridine-4-yl)phenyl)propane-1,3-diol), and its assembly in the coordination polymer {[Fe4(PhpPy)2(dpm)6Ag](ClO4)}n, Fe4Ag, upon reaction with silver(I) perchlorate. Thanks to the presence of the pyridyl rings on the two tripodal ligands, Fe4 behaves as divergent ditopic linker, and due to the Fe4:AgClO4 1:1 ratio, Fe4Ag probably possesses a linear arrangement in which silver(I) ions are linearly coordinated by two nitrogen atoms, forming 1D chains whose positive charge is balanced by the perchlorate anions. The stabilization of such a polymeric structure can be ascribed to the long distance between the two donor nitrogen atoms (23.4 Å) and their donor power. Fe4Ag shows slow relaxation of the magnetization which follows a thermally activated process with Ueff/kB = 11.17(18) K, τ0 = 2.24(17) 10−7 s in zero field, and Ueff/kB = 14.49(5) K, τ0 = 3.88(8) 10−7 s in 1-kOe applied field, in line with what reported for tetrairon(III) SMMs acting as building blocks in polymeric structures. View Full-Text
Keywords: single-molecule magnets; iron; silver; magnetic properties; coordination polymer single-molecule magnets; iron; silver; magnetic properties; coordination polymer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Rigamonti, L.; Vaccari, M.; Roncaglia, F.; Baschieri, C.; Forni, A. New Silver(I) Coordination Polymer with Fe4 Single-Molecule Magnets as Long Spacer. Magnetochemistry 2018, 4, 43.

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