Designing a Dy2 Single-Molecule Magnet with Two Well-Differentiated Relaxation Processes by Using a Nonsymmetric Bis-bidentate Bipyrimidine- N-Oxide Ligand: A Comparison with Mononuclear Counterparts

Inorganic Chemistry
Ismael F Díaz-OrtegaEnrique Colacio

Abstract

Herein we report a dinuclear [(μ-mbpymNO){(tmh)3Dy}2] (1) single-molecule magnet (SMM) showing two nonequivalent DyIII centers, which was rationally prepared from the reaction of Dy(tmh)3 moieties (tmh = 2,2,6,6-tetramethyl-3,5-heptanedionate) and the asymmetric bis-bidentate bridging ligand 4-methylbipyrimidine (mbpymNO). Depending on whether the DyIII ions coordinate to the N^O or N^N bidentate donor sets, the DyIII sites present a NO7 ( D2 d geometry) or N2O6 ( D4 d) coordination sphere. As a consequence, two different thermally activated magnetic relaxation processes are observed with anisotropy barriers of 47.8 and 54.7 K. Ab initio calculations confirm the existence of two different relaxation phenomena and allow one to assign the 47.8 and 54.7 K energy barriers to the Dy(N2O6) and Dy(NO7) sites, respectively. Two mononuclear complexes, [Dy(tta)3(mbpymNO)] (2) and [Dy(tmh)3(phenNO)] (3), have also been prepared for comparative purposes. In both cases, the DyIII center shows a NO7 coordination sphere and SMM behavior is observed with Ueff values of 71.5 K (2) and 120.7 K (3). In all three cases, ab initio calculations indicate that relaxation of the magnetization takes place mainly via the first excited-state Kramers doubl...Continue Reading

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Citations

Oct 16, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Yaru QinYi-Quan Zhang
Dec 1, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Leena MandalMasahiro Yamashita
May 31, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Sourav DeyGopalan Rajaraman
Nov 28, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jedrzej KobylarczykRobert Podgajny
Sep 16, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Joydev AcharyaVadapalli Chandrasekhar

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