01992nas a2200193   4500008004100000245012700041210006900168260000800237300001600245490000600261520127800267100001701545700001901562700002701581700002601608700001901634700001701653856012801670       2017                        eng d00aLn(8) (Ln = Gd, Ho, Er, Yb) Butterfly core-exhibiting magnetocaloric effect and field-induced SMM behavior for Er analouge0 aLn8 Ln Gd Ho Er Yb Butterfly coreexhibiting magnetocaloric effec  cDEC  a11341-113450 v23 a<p>In this article, we report four pyridyl-pyrazolyl based poly-nuclear cluster complexes with Ln(8) {Ln = [Gd-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](DMF)(2)(MeOH)(1), [Ho-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](2), [Er-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](DMF)(MeOH)(H2O)(3), [Yb-8(III)(mu(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 (-Delta S-m ) of 31.4 J kg(-1) K-1 for Delta H = 9 T at T = 3 K whereas Er analogue complex 3 displayed SMM behavior.</p>1 aBala, Sukhen1 aAdhikary, Amit1 aBhattacharya, Sudeshna1 aBishwas, Mousumi, Sen1 aPoddar, Pankaj1 aMondal, Raju  uhttps://library.ncl.res.in/content/ln8-ln-gd-ho-er-yb-butterfly-core-exhibiting-magnetocaloric-effect-and-field-induced-smm