Acid and alkali-resistant Dy₄coordination clusters: synthesis, structure and slow magnetic relaxation behaviors

Abstract

Two new [Dy4]-based coordination clusters [Dy4(L1)2(L2)4(NO3)2(EtOH)4]·2MeOH (1) (H3L1 = 2-(β-naphthalideneamino)-2-(hydroxylmethyl)-1-propanol, HL2 = 2-hydroxy-1-naphthaldehyde) and [Dy4(µ4-O)(HL3)4(H2L3)2]·3H2O·EtOH·CH3CN (2) (H3L3 = 3-(((2-hydroxynaphthaen-1-yl)methylene)amino)-propane-1,2-diol) with planar and butterfly-like skeleton, respectively, were synthesized and characterized. It...

Slow magnetic relaxation in a Dy3 triangle and a bistriangular Dy6 cluster

“…Specifically, the toroidal moment, responsible for single-molecule toroics (SMTs), has been found in certain Dy III 3 triangles, which show SMM behavior even in an almost diamagnetic ground state. [18][19][20][21][22][23][24][25][26][27][28][29][30] This discovery has sparked particular attention in the construction of other polynuclear lanthanide clusters, such as Dy 3 , 22,24,[31][32][33][34][35][36][37] Dy 4 , 27,30,[38][39][40] Dy 5 [41][42][43][44][45][46] and Dy 6 . 28,32,47,48 It should be mentioned that besides the high symmetry of Ln III ions, complex factors such as the intermetallic magnetic interactions, inherent anisotropies and the spatial arrangement of the local Ln III ions within the polynuclear systems play a vital role in realizing good SMM performance.…”

Superb Alkali-Resistant DyIII2NiII4 Single-Molecule Magnet

“…Additionally, their corresponding PXRD patterns are consistent with the simulated patterns, which is indicative of the extreme alkaline stability of 1 (Figure and Figure S6). Importantly, such superb alkali-resistant stability is better than that of our recently reported 0D [Dy 4 (μ 4 -O)­(HL 3 ) 4 (H 2 L 3 ) 2 ] (H 3 L 3 = 3-(((2-hydroxynaphthaen-1-yl)­methylene)­amino)­propane-1,2-diol) with slow magnetic relaxation behavior and is even better than those of many 0D, 1D, 2D and 3D coordination polymers. − Some typical coordination compounds with excellent alkali resistance are given in Table S2. Unfortunately, after compound 1 was immersed in aqueous solutions with different pH values and organic bases, analyses could not be performed on the single-crystal X-ray diffractometer; thus, their PXRD patterns were checked (Figure S6).…”

“…According to the classic hard–soft acid–base (HSAB) theory, 4f metal ions are hard acids and easily coordinate with O atoms, while 3d metal ions such as Ni 2+ ions and Fe 2+ ions are borderline acids and exhibit strong affinity with both N and O atoms . Thus, to obtain 3d–4f heterometallic compounds, the choice of appropriate polydentate ligands (e.g., Schiff base, Mannich base, oxime and 8-hydroxyquinoline) possessing N and O atoms is viewed as the most effective synthetic strategy in all of the explored methods. − …”

Self-assembly of octanuclear Ln(iii)-based clusters: their large magnetocaloric effects and highly efficient conversion of CO2

“…The τ 0 value of 2 is consistent with the reported values of 10 −6 -10 −12 s for polynuclear or high-nuclear Dy(III)-based SMMs. [79][80][81][82][83][84][85][86][87][88][89][90][91] In addition, the Cole-Cole diagram of cluster 2 was plotted via χ″ vs. χ′ from 2.0 to 14.0 K under the optimum field (H dc = 3000…”