In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2018, No. 47 ( 2018-12-19), p. 5075-5090
Abstract:
The reaction of VOSO 4 with K 2 cbdc (cbdc 2– is cyclobutane‐1,1‐dicarboxylate anion) and Ln(NO 3 ) 3 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Tm, Yb, Lu) yielded 17 novel heterometallic Ln III ‐V IV compounds comprising stable bis‐chelate units {V IV O(cbdc) 2 (H 2 O)}. Three structural types of compounds are formed depending on the nature of the rare‐earth metal: 1D polymers {[Ln(VO)(cbdc) 2 (H 2 O) 7 ] · 0.5[VO(cbdc) 2 ]} n (structural type I) [Ln = La ( 1 ), Ce ( 2 )], 3D polymers {[KLn(VO) 2 (cbdc) 4 (H 2 O) 9 ] · 3.5H 2 O} n (structural type II) [Ln = La ( 3 ), Ce ( 4 ), Pr ( 5 ), Nd ( 6 ), Sm ( 7 ), Eu ( 8 ), Gd ( 9 ), Tb ( 10 ), Dy ( 11 ), Ho ( 12 )] comprising trinuclear units {LnV 2 }, and octanuclear complexes {[KLn(VO) 2 (cbdc) 4 (H 2 O) 11 ] · 2H 2 O} 2 (structural type III) [Ln = Y ( 13 ), Er ( 14 ), Tm ( 15 ), Yb ( 16 ), Lu ( 17 )] containing dinuclear units {LnV}. Magnetic properties were investigated for all isolated compounds. The Gd III ‐V IV compound has ferromagnetic and antiferromagnetic exchange interactions between isotropic V IV and Gd III ions. Calculations using the DFT method at the UB3LYP/6‐31G(d,p)/SDD level of theory were performed in order to explain the different nature of exchange interactions in two Gd III ‐V IV pairs. The Yb III ‐V IV complex displays single‐molecule magnet properties; the effective energy barrier was estimated at Δ E eff /k B = 26 K. The magnetic properties of Ln III ‐V IV compounds with heavy lanthanide ions (Ln III = Er, Tm, Yb) were rationalized in terms of crystal‐field calculations for Ln III ions.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2018.47
DOI:
10.1002/ejic.201801034
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
1475009-0
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