Slow magnetic relaxation in a {EuCu5} metallacrown. Issue 5 (8th January 2019)

• Record Type: Journal Article
• Authors: Wang, Jin; Ruan, Ze-Yu; Li, Quan-Wen; Chen, Yan-Cong; Huang, Guo-Zhang; Liu, Jun-Liang; Reta, Daniel; Chilton, Nicholas F.; Wang, Zhen-Xing; Tong, Ming-Liang
• Is Part Of: Dalton transactions. Volume 48:Issue 5(2019)
• Page Start: 1686
• Page End: 1692
• Publication Date: 2019-01-08
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04814b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A {Eu III Cu5 } metallacrown displays field-induced slow magnetic relaxation, in which the Eu III with diamagnetic ground state enhances the relaxation rates. Abstract : A 3d–4f heterometallic metallacrown with formula of [EuCu5 (quinha)5 (sal)2 (py)5 ]CF3 SO3 ·py·3H2 O (1 ) (H2 quinha = quinaldichydroxamic acid; Hsal = salicylaldehyde) has been synthesized. This complex shows field-induced slow magnetic relaxation via a Raman-like process, where studies of the isostructural {LuCu5 } (2 ) and {YCu5 } (3 ) complexes show that the slow dynamics mainly arise from the {Cu5 } S = 1/2 ground state rather than the Eu III ion. However, the Eu III ion enhances the relaxation rates of the {Cu5 } unit which likely arises from second-order effects in the formally diamagnetic 7 F0 ground state of Eu III .