Double magnetic relaxation and magnetocaloric effect in the $\{Mn_9[W(CN)_8]_6(4,4'-dpds)_4\}$ cluster-based network
| Autor: | Szymon Chorazy, Robert Pełka, Tadeusz Wasiutyński, Robert Podgajny, Stanisław Baran, Piotr Konieczny, Klaudia Bednarek, Barbara Sieklucka |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Bridging (networking)
Condensed matter physics 010405 organic chemistry Chemistry Hydrogen bond Quantum Monte Carlo Supramolecular chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography Magnetic refrigeration Magnetic relaxation Physical and Theoretical Chemistry Ground state Cluster based |
| Popis: | Cyanide-bridged {MnII9[WV(CN)8]6} clusters with the ground state spin SSG = 39/2 were connected by a 4,4′-dipyridyl disulfide (4,4′-dpds) linker into 2-D double-connected coordination layers of the I0O2 type, {MnII9(4,4′-dpds)4(MeOH)16[WV(CN)8]6}·12MeOH (1). The intercluster contacts are controlled by the bridging MnII–(4,4′-dpds)–MnII coordination modes and direct hydrogen bonds W–CN···HOMeOH–Mn in three crystallographic directions, with the vertex-to-vertex contact unprecedented in {Mn9W6}-based networks dominating over the typical edge-to-edge contacts. The resulting 3D supramolecular network of high-spin clusters was subjected to a thorough magnetic characterization in context of two critical issues. First, the intracluster WV–CN–MnII exchange coupling and intercluster interaction were successfully modeled through the combination of dc measurements, Quantum Monte Carlo simulations, and mean-field calculations, yielding a reasonable Jap = −8.0 cm–1, Jeq = −19.2 cm–1 (related to apical and equatorial CN... |
| Databáze: | OpenAIRE |
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