Abstract
Isostructural Ln(III) mononuclear complexes [Ln(NO3)2L]PF6·MeCN (Ln = Nd, Tb, or Dy; L denotes a helical hexa-dentate ligand) were synthesized, and their slow magnetic relaxation behavior was investigated. In these complexes, oblate-type Ln(III) ions are located in an axially stressed ligand field with two nitrate anions, and can exhibit single-molecule magnet (SMM) behavior. Field-induced SMM behavior was observed for Nd(III) and Dy(III) complexes under an applied bias DC field of 1000 Oe.
Highlights
Single-molecule magnets (SMMs) are fascinating molecule-based nanomaterials [1,2,3,4,5,6,7,8]
As the orbital angular momentum of 4f electrons are maintained and unquenched, each lanthanide(III) (Ln(III)) ion possesses a large magnetic moment correlated with the total angular momentum, J, which is defined by the length of the resultant vector of the spin angular momentum, S, and the orbital angular momentum, L
Each sub-level, which is characterized by magnetic quantum number Jz, has a distinguishable electronic distribution and interacts with the crystal field in a different manner
Summary
Single-molecule magnets (SMMs) are fascinating molecule-based nanomaterials [1,2,3,4,5,6,7,8]. We reported the syntheses and crystal structures of a series of Ln(III) complexes constructed from a single helical ligand (L, Figure 1) and two nitrate anions, [LnL(NO3)2]PF6·MeCN (Ln = Nd, Eu, Gd, and Tb) and [HoL(NO3)2]PF6·2MeCN, with the aim of highly efficient f-f luminescence by UV irradiation of aromatic bipyridine moieties in L [12]. TTeemmppeerraattuurree ddeeppeennddeennccee ooff tthhee χχMMTT pprroodduuccttss ooff 11 ((ooppeenn ttrriiaanngglleess)),, 22 ((cclloosseedd cciirrcclleess)),, aanndd 33 ((ooppeenn cciirrcclleess)) mmeeaassuurreedd uunnddeerr aann aapppplliieedd DDCC fifieellddooff11000000OOee
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