Introduction to Single‐Molecule Magnets

An Exchange Mechanism for the Magnetic Behavior of Er3+ Complexes

“…From a theoretical perspective, the quest for adequate methods and models to predict the magnetic behavior of these compounds has generated lively debates and a fruitful exchange of ideas in recent years [ 4 , 5 , 6 , 7 , 8 , 9 ]. By virtue of their intrinsically large magnetic anisotropy, lanthanide series possess a great potential for application in magnetic memory storage nanounits [ 10 , 11 , 12 , 13 ] and stand as promising candidates for the realization of quantum logical devices. On the other hand, some lanthanide complexes, such as dysprosium and gadolinium based compounds, are ideal for implementation in magnetic resonance imaging [ 14 , 15 , 16 ].…”

Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study

“…Molecular magnets constitute a highly interesting class of modern magnetic materials [1,2], the rapid development of which over the last decades [3][4][5][6][7] required concerted effort of theoreticians and experimentalists. Zero-dimensional molecular nanomagnets [8,9] offer the possibility of exploring a plethora of intriguing fundamental physical phenomena due to the underlying quantum physics [10]. On the other hand, the possible multifunctionality of molecular magnets [11] opens the way towards numerous applications.…”

Magnetic materials based on heterometallic CrII/III–LnIII complexes

“…1,2 This example launched an entirely new research direction in the molecular magnetism field, which soon turned from a solely coordination chemistry context into the centrepiece theme of a multidisciplinary research field. 3–5 The SMM can be defined as a discrete coordination or organometallic molecular entity that can retain its magnetization even in the absence of an external dc magnetic field below a certain temperature. Unlike conventional bulk magnets, they behave as quantized systems, and their magnetization dynamics are solely of molecular origin instead of a collective phenomenon.…”

“…This is because the uniaxial magneto-anisotropy parameter (D) usually shares an inverse relationship with S 2 , making U eff virtually invariant to S. [53][54][55] As a proof of principle, a Mn 19 complex [Mn III 12 Mn II 7 (μ 4 -O) 8 (μ 3 ,η 1 -N 3 ) 8 (HL 1 ) 12 (MeCN) 6 ]Cl 2 (2) possesses a remarkably large ground state spin of 83/2, but surprisingly did not show any SMM behaviour due to its overall negligible anisotropy. 56 On the contrary, interesting SMM behaviour can be retrieved successfully just by invoking a highly anisotropic Dy III ion through the replacement of the central isotropic Mn II centre in the resultant complex [Mn III 12 Mn II 6 Dy III (μ 4 -O) 8 (μ 3 -Cl) 6.5 (μ 3 -N 3 ) 1.5 (HL 1 ) 12 (MeOH) 6 ]Cl 3 (3) [L 1 H 3 = 2,6-bis(hydroxymethyl)-4methylphenol]. 57 Subsequently, the Ln III -based SMM field has started blooming since the seminal discovery of double-decker mononuclear phthalocyanine (Pc) lanthanide complexes [Ln III Pc 2 ] n (Ln III = Tb, Dy, Ho; H 2 Pc = phthalocyanine; n = −1, 0, +1) (4), by the Ishikawa group, portraying interesting SMM behaviour.…”