Syntheses, structural modulation, and slow magnetic relaxation of three dysprosium(iii) complexes with mononuclear, dinuclear, and one-dimensional structures. Issue 39 (14th September 2021)

• Record Type: Journal Article
• Authors: Ye, Hua-Jian; Zhang, Tian; Huang, Shu-Yuan; Liu, Xiao-Ling; Chen, Wen-Bin; Zhang, Yi-Quan; Tang, Jinkui; Dong, Wen
• Is Part Of: Dalton transactions. Volume 50:Issue 39(2021)
• Page Start: 13728
• Page End: 13736
• Publication Date: 2021-09-14
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02532e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Three mononuclear, dinuclear and one-dimensional dysprosium(iii ) complexes based on 3-azotriazolyl-2, 6-dihydroxybenzoic acid displaying slow magnetic relaxation were synthesized and characterized. Abstract : Three mononuclear, dinuclear and one-dimensional dysprosium(iii ) complexes based on 3-azotriazolyl-2, 6-dihydroxybenzoic acid (H4 ATB) of [Dy(H3 ATB)3 ]·3H2 O (1 ), [Dy2 (H2 ATB)2 (H2 DHB)2 (H2 O)4 ]·2CH3 CN·5H2 O (2 ), and [Dy2 (H2 ATB)2 (DCB)(DMF)2 (H2 O)2 ]·4DMF (3 ) were synthesized and structurally characterized by X-ray single crystal diffraction (H3 DHB = 2, 6-dihydroxybenzoic acid, H2 DCB = 1, 4-dicarboxybenzene). Complex 1 was used as a precursor to synthesize complexes 2 and 3, and 2 was further used to synthesize 3 . Complex 1 is a mononuclear complex, in which the Dy(iii ) ion is in a nine-coordinated structure surrounded by three tridentate chelate H3 ATB − ligands. Complex 2 displays a dinuclear structure bridged by two μ2 carboxyl groups of two H2 DHB − ligands and two μ1, 1 -O atoms from the phenolic hydroxyl groups of two H2 ATB 2− ligands. Complex 3 shows a one-dimensional structure formed by two bridging DCB 2− ligands. The magnetic measurements were performed on three complexes 1–3, and they showed different magnetic behavior. Complex 1 shows a field-induced slow magnetic relaxation. Complexes 2 and 3 display distinct slow magnetic relaxation under zero dc field with energy barriers ( U eff ) of 26(2) cm −1 and 11(1) cm −1, respectively. The magnetic behavior of three complexes 1–3 was investigated by ab initio calculations.