Recent advances in 3d-4f magnetic complexes with several types of non-carboxylate organic ligands

Role of the Templating Heteroatom on Both Structural and Magnetic Properties of POM‐Based SIM Lanthanoid Complexes

“…Therefore, the above could induce subtle modifications on Ligand Field affecting the relaxation dynamics, which are sensitive to these variables. [14,73] As was mentioned above, when describing the relaxation dynamics of Dy III and Er III complexes with [XW 11 O 39 ] nÀ ligands, where X=Ge IV , Si IV and P V , it is possible to infer that for the inorganic Dy III ) 2 ] 11À do not have any signal at zero dc field. In the case of the [Er III (PW 11 O 39 ) 2 (phen) 2 ] 4À complex, the system present SIM behaviour, but the QTM is dominant even at high fields, and when we compare the Orbach relaxation mechanism of this system with other inorganic analogues, [Er III (SiW 11 O 39 ) 2 ] 13À and [Er III (GeW 11 O 39 ) 2 ] 13À , it is possible to observed that both complexes show SIMs properties, however, only for the second one the U eff and τ 0 values are reported under an applied dc field.…”

Co3Gd4 Cage as Magnetic Refrigerant and Co3Dy3 Cage Showing Slow Relaxation of Magnetisation

“…Polymetallic 3d-4f systems have developed as a fascinating sub-area of research in magnetism [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Accordingly, a large number of multinuclear 3d-4f cages have been reported in the literature, mainly with carboxylate, tripodal alkoxides and related ligands [31,[35][36][37][38][39][40].…”

“…Gd 3+ ions are suitable for the MCE, as they have a high isotropic spin, quenched orbital momentum and weak superexchange interactions. Therefore, 3d-Ln cages comprised of Gd III ions are suitable as magnetic refrigerants [11][12][13][14][15][46][47][48], and those with Dy III ions (anisotropic) are ideal for SMM behaviour [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Nickel Complexes of 2,3,5,6‐tetra‐(2‐pyridyl)pyrazine Containing [Ln(NO3)5]2− [Ln(III)=Nd, Eu, Gd, Tb, Dy, Er] as Counterions‐Syntheses, Structures and Luminescent Properties

“…Choosing an appropriate organic ligand with ligating atoms linked with 3d and 4f ions simultaneously is a key to synthesize 3d-4f coordination complexes. [2] One of our current research interests has focused on the construction of luminescent polynuclear 4f and 3d-4f complexes by using the π-conjugated N-heterocyclic ligand 2,3,5,6-tetra(2-pyridyl) pyrazine (tppz). [3] Tppz is a remarkably versatile electron donor that displays a wide variety of binding modes.…”

“…Therefore, [Ni(tppz) 2 ](NO 3 ) 2 was used as the building block to react with Ln(NO 3 ) 3 • 6H 2 O under solvothermal condition to construct heterometallic 3d-4f coordination complexes. As a result, a new 3d-4f heterometallic coordination complexes [Ni(tppz) 2 ][Ln(NO 3 ) 5 ] ((where tppz = 2,3,5,6-tetra(2pyridyl) pyrazine and Ln(III) = Nd (1), Eu (2), Gd (3), Tb (4), Dy (5), Er (6)) were obtained. Complexes 1-6 were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction, and powder X-ray diffraction.…”