A Tetranuclear Dysprosium Schiff Base Complex Showing Slow Relaxation of Magnetization

Abstract

A tetranuclear dysprosium Schiff base complex was isolated by reacting dysprosium chloride with 2-hydroxy-3-methoxybenzaldehyde and 2-(aminomethyl)pyridine in-situ under basic conditions. The isolated Dy(III) complex was characterized by elemental analyses, single crystal X-ray diffraction and molecular spectroscopy. The complex crystallizes in the triclinic space group P-1 with unit cell parameters of a = 10.2003 (4), b = 13.8602 (5), c = 14.9542 (6), α = 94.523 (3), β = 109.362 (4), and γ = 99.861 (3). The magnetic properties of 1 have been investigated by DC and AC susceptibility measurements. The DC measurements reveal weak exchange coupling of antiferromagnetic nature. In the AC measurement, the complex shows a slow relaxation of magnetization in the absence of an external magnetic field.

A heptanuclear {Dy2Cu5} complex as a single-molecule magnet

“…Several publications confirm that the presence of multimode relaxation paths is quite common among Dy(III) complexes. [31][32][33][34] The relaxation times for the LF, IF and HF relaxation channels are plotted in Fig. 7 versus reciprocal temperature…”

A dinuclear dysprosium Schiff base complex showing slow magnetic relaxation in the absence of an external magnetic field

“…In this context, Schiff bases are ideal candidates because of their fine tunability for the ligand field by varying the substituents of both aldehydic and amine precursors. 31,42,43 This fact is supported by the large number of reports on constructing lanthanide-based SMMs [25][26][27][28][29][30][31][32][33][34][35][36][37] especially those based on dysprosium 19,31,34,44 and Schiff bases, which can be effectively employed in constructing SMMs with desired properties.…”

“…In this context, Schiff bases are ideal candidates because of their fine tunability for the ligand field by varying the substituents of both aldehydic and amine precursors. 31,42,43…”

Triangulo-{ErIII3} complex showing field supported slow magnetic relaxation

“…The reports on lanthanide based SIMs and SMMs increased recently, aer the report of Ishikawa's phthalocyanine mononuclear double decker SIMs 16 and Powell's exotic Dy 3 triangles showing SMM behavior in a thermally populated excited state with an almost nonmagnetic ground state. 17 In continuation of these reports, pure Dy(III) based SMMs have drawn the attention of many investigators as evident by the huge number of contributions to this particular eld of molecular magnetism, [18][19][20][21][22][23][24][25][26][27][28][29][30][31] generating a variety of SMM's with Dy(III). 4,[32][33][34][35][36][37] But their characteristics with respect to the blocking temperature and energy barrier need further improvement and advancement.…”

“…In continuation of these reports, pure Dy( iii ) based SMMs have drawn the attention of many investigators as evident by the huge number of contributions to this particular field of molecular magnetism, 18–31 generating a variety of SMM's with Dy( iii ). 4,32–37 But their characteristics with respect to the blocking temperature and energy barrier need further improvement and advancement.…”