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Ln 8 (Ln= Gd, Ho, Er, Yb) Butterfly Core‐Exhibiting Magnetocaloric Effect and Field‐Induced SMM Behavior for Er Analouge
Author(s) -
Bala Sukhen,
Adhikary Amit,
Bhattacharya Sudeshna,
Bishwas Mousumi Sen,
Poddar Pankaj,
Mondal Raju
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701905
Subject(s) - magnetic refrigeration , lanthanide , isostructural , crystallography , chemistry , metal ions in aqueous solution , ion , hexagonal prism , metal , coordination geometry , crystal structure , ligand (biochemistry) , magnetic field , hexagonal crystal system , molecule , magnetization , physics , hydrogen bond , receptor , biochemistry , organic chemistry , quantum mechanics
In this article, we report four pyridyl‐pyrazolyl based polynuclear cluster complexes with Ln 8 {Ln=[Gd III 8 (μ 3 ‐OH) 4 (L 1 ) 4 (DEA) 4 Cl 4 ](DMF) 2 (MeOH)( 1) , [Ho III 8 (μ 3 ‐OH) 4 (L 1 ) 4 (DEA) 4 Cl 4 ]( 2) , [Er III 8 (μ 3 ‐OH) 4 (L 1 ) 4 (DEA) 4 Cl 4 ](DMF)(MeOH)(H 2 O)( 3 ), [Yb III 8 (μ 3 ‐OH) 4 (L 1 ) 4 (DEA) 4 Cl 4 ](DMF)(MeOH)( 4 ) [DEA = Diethanolamine] cores. The impetus for this study was to explore the magnetic behaviour of lanthanide ions which are often ignored or overlooked. X‐ray crystal analysis show that these complexes are isostructural and exhibit an interesting butterfly like topology. The semi‐rigidity and asymmetric nature of the ligand led to different coordination environment around the metal centres. The lanthanide ions adopt two types of geometry, a bicapped trigonal prism and a distorted square antiprismatic geometry around the metal center. Such dissimilar coordination environments around the lanthanide centre can have profound effects on their magnetic behaviour. Indeed, the magnetic measurements revealed significant magnetocaloric effect for octanuclear gadolinium complex 1 with magnetic entropy change (−ΔS m ) of 31.4 J kg −1 K −1 for ΔH = 9 T at T = 3 K whereas Er analogue complex 3 displayed SMM behavior.