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Pentanuclear Spirocyclic Ni 4 Ln Derivatives: Field Induced Slow Magnetic Relaxation in the Dysprosium and Erbium Analogues
Author(s) -
Shukla Pooja,
Roy Soumalya,
Dolui Dependu,
CañónMancisidor Walter,
Das Sourav
Publication year - 2020
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.201901350
Subject(s) - chemistry , dysprosium , crystallography , isostructural , octahedron , dodecahedron , antiferromagnetism , lanthanide , ion , stereochemistry , crystal structure , inorganic chemistry , physics , organic chemistry , condensed matter physics
Five pentanuclear heterometallic isostructural complexes, [Ni 4 Ln(L) 2 (LH) 2 (CH 3 CN) 3 Cl] · x H 2 O · y CH 3 OH {Ln = Y III ( 1 ), Gd III ( 2 ), Tb III ( 3 ), Dy III ( 4 ) and Er III ( 5 )} [for 1 and 2 , x = 2, y = 1; for 3 , x = 6, y = 2; for 4 , x = 5, y = 1; for 5 , x = 2, y = 2] were prepared by the reaction of ( E )‐2‐(hydroxymethyl)‐6‐{[(2‐hydroxyphenyl)imino]methyl}‐4‐methylphenol (LH 3 ) with LnCl 3 · 6H 2 O and Ni(OAc) 2 · 4H 2 O in the presence of tetrabutylammonium hydroxide (TBA‐OH) base. The structural characterization reveals that compounds 1 – 5 contain a spirocyclic pentanuclear core [Ni 4 Ln(µ 3 ‐O) 4 (µ 2 ‐O) 4 ] 3+ where two triangular motifs [Ni 2 Ln(µ 3 ‐O) 2 (µ 2 ‐O) 2 ] 3+ are fused together through a common vertex of the Ln III ion. The central Ln III ion forms an eight‐coordinated distorted triangular dodecahedron geometry, while the nickel(II) ions form a distorted octahedron geometry. Comprehensive dc magnetic studies reveal that antiferromagnetic exchange interaction exists between the Ni II centres. The ac susceptibility measurement revels that dysprosium and erbium analogue shows field induced slow magnetic relaxation with an anisotropic barrier ( U eff ) of 25.12 cm –1 and 22.13 cm –1 respectively.