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Homodinuclear {Ln III 2 } (Ln III = Gd III , Tb III , Ho III , and Dy III ) Complexes: Field‐Induced SMM Behavior of the Dy III and Tb III Analogues
Author(s) -
Kalita Pankaj,
Goura Joydeb,
Manuel Herrera Martínez Juan,
Colacio Enrique,
Chandrasekhar Vadapalli
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801049
Subject(s) - chemistry , isostructural , crystallography , denticity , lanthanide , ligand (biochemistry) , magnetization , crystal structure , stereochemistry , ion , physics , magnetic field , biochemistry , receptor , organic chemistry , quantum mechanics
A family of four dinuclear complexes, [NHEt 3 ] 2 [Ln 2 ( µ ‐NO 3 ) 2 (NO 3 ) 2 (HL) 2 ] [Ln = Gd III ( 1 ), Tb III ( 2 ), Ho III ( 3 ), Dy III ( 4 )], were synthesized by the reaction of an enolizable multidentate Schiff base ligand H 3 L (H 3 L = N′ ‐(2‐hydroxy‐3‐methoxy‐5‐nitrobenzylidene)‐2‐(hydroxyimino)propanehydrazide) with hydrated lanthanide nitrates in the presence of NEt 3 . The molecular structure of complexes 1 – 4 was confirmed by single‐crystal XRD analysis. All of the centrosymmetric complexes are dianionic, isostructural and each of the Ln III centers is nine‐coordinate and adopts a muffin like coordination geometry as indicated by SHAPE analysis. The dynamic magnetization studies revealed that the compounds 2 and 4 are field‐induced single‐molecule magnets with effective energy barriers, U eff = 34(2) K (for 2 ) and 80(3) K (for 4 ) and pre‐exponential factors, τ o = 1.1 × 10 –8 s (for 2 ) and 1.15 × 10 –7 s (for 4 ).