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Open AccessArticle

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

Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
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;
Received: 11 May 2018 / Revised: 12 September 2018 / Accepted: 25 September 2018 / Published: 1 October 2018
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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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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