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Chiral bipyrimidine-bridged dinuclear Ln III  complexes of general formula [(μ-bipym){((+)-tfacam) 3 Ln} 2 ] and [(μ-bipym){((-)-tfacam) 3 Ln} 2 ], have been prepared from the assembly of Ln(AcO) 3 ·nH 2 O (Ln III  = Dy, Gd), (+)/(−)-3-(trifluoroacetyl)camphor enantiopure ligands ((+)/(-)-Htfacam) and bipyrimidine (bipym). The structure and chirality of these complexes have been supported by single-crystal X-Ray diffraction and circular dichroism. The study of the magnetic properties of the Gd III  complexes revealed a very weak antiferromagnetic interaction between the Gd III  ions through the bipyrimidine bridging ligand.  Ab initio  CASSCF calculations indicated that the ground Kramers doublet (KD) of both Dy III  centers is almost purely axial with the anisotropy axis located close to the two tfacam − ligands at opposite sides of each Dy III atom, which create an axial crystal field. In keeping with this,  ac  dynamic measurements indicated slow relaxation of the magnetization at zero field with  U  eff  = 55.1 K, a pre-exponential factor of τ o  = 2.17·10 −6  s and τ QTM  = 8 μs. When an optimal dc field of 0.1 T is applied, QTM is quenched and  U  eff  increases to 75.9 K with τ o  = 6.16 × 10 −7  s. The DyN 2 O 8  coordination spheres and SMM properties of [(μ-bipym){((+)-tfacam) 3 Ln} 2 ] and their achiral [(Dy(β-diketonate) 3 ) 2 (μ-bpym)]analogous have been compared and a magneto-structural correlation has been established, which has been supported by theoretical calculations. In contrast to the Gd III  compounds, the magnetic exchange interaction between the Dy III  ions has been calculated to be very weak and, generally, ferromagnetic in nature. Relaxation mechanisms for [(μ-bipym){((+)-tfacam) 3 Ln} 2 ] and previously reported analogous have been proposed from  ab initio  calculations. As the magnetic exchange interaction found to be very weak, the observed magnetization blockade in these systems are primarily dictated by the single ion anisotropy of Dy III  ions.

frontiers in chemistry

A Chiral Bipyrimidine-Bridged Dy2 SMM: A Comparative Experimental and Theoretical Study of the Correlation Between the Distortion of the DyO6N2 Coordination Sphere and the Anisotropy Barrier