Slow magnetic relaxation in mononuclear gadolinium(III) and dysprosium(III) oxamato complexes

Europium(III), Terbium(III), and Gadolinium(III) Oxamato-Based Coordination Polymers: Visible Luminescence and Slow Magnetic Relaxation

“…On the other hand, there are a few examples of hydrogen-bonded polymers based on mononuclear complexes with 4f ions and oxamato ligands exhibiting magnetic and optical properties. − One of them, namely, Me 4 N­[Dy III (HL) 4 ]·2CH 3 CN [HL = N -(2,6-dimethylphenyl)­oxamate; Me 4 N + = tetramethylammonium cation], featuring a 2D hydrogen-bonded herringbone net topology, exhibits a single-ion magnet (SIM) behavior . The magnetic and luminescent properties of a variety of isoreticular metal–organic framework-3 (IRMOF-3) Ln III ions (Eu III , Tb III , Nd III ) with ethyl oxalyl monochloride and ethyl acetoacetate were reported by Abdelhameed et al They show that these complexes are efficient near-infrared and visible light emitters, with a quantum yield less than 1% and 1–2% for Eu III and Tb III compounds, respectively.…”

“…The magnetic and luminescent properties of a variety of isoreticular metal–organic framework-3 (IRMOF-3) Ln III ions (Eu III , Tb III , Nd III ) with ethyl oxalyl monochloride and ethyl acetoacetate were reported by Abdelhameed et al They show that these complexes are efficient near-infrared and visible light emitters, with a quantum yield less than 1% and 1–2% for Eu III and Tb III compounds, respectively. The Gd III derivative in the series of lanthanide­(III)-oxamate complexes of general formula Na­[Ln­(4-HOpa) 4 (H 2 O)]·2H 2 O [Ln = Eu, Gd, Dy, and Ho and 4-HOpa = N -(4-hydroxyphenyl)­oxamate] exhibits a rare slow magnetic relaxation . More recently, Vaz et al reported magnetic and optical studies for the oxamate-containing Gd III , Eu III , Dy III , and Tb III complexes of formula Bu 4 N­[Eu III (HL) 4 (dmso)]· n H 2 O [H 2 L = N -(4- X phenyl)­oxamic acid with X = F or Cl; Bu 4 N + = tetra- n -butylammonium cation].…”

Solvothermal synthesis, structure and magnetic properties of heterometallic coordination polymers based on a phenolato-oxamato co-bidentate-tridentate ligand

“…11,12 Similar issues have been observed with the para-substitued phenyloxamate ligands, with either carboxylato or hydroxido additional groups where the oxamate and the additional coordinating groups are only partially or not at all binding (Scheme 1, b-e). [13][14][15][16] On the other hand, the ortho-substituted carboxylato-phenyloxamate ligand has been reported entirely coordinating in homometallic copper-based polymers (Scheme 1g). 17 These observations led us to recently investigate the reactivity of the ortho-subsituted N-(2-hydoxyphenyl)oxamic acid (H3ohpma).…”

Synthesis, structure and magnetic properties of an oxamate-based 1D coordination polymer built on pentametallic links

“…[1][2][3][4][5][6][7] While phenyl-based oxamate ligands, [8][9][10][11] and amino-acid-based oxamate ligands now represent the bulk of the investigations, [12][13][14][15][16][17][18][19][20][21][22][23] a sub-class of aromatic oxamate ligands that are substituted with additional -non-oxamic-coordinating groups starts to gain attention. [24][25][26][27][28][29][30][31][32][33] Like the amino-acid-based oxamate ligands, such multi-polydentate ligands bearing additional carboxylato, hydroxido or N-donor groups offer diverse coordination modes with metal ions, which give access to new structural types. Recently, this led us to investigate the reactivity of the 2-hydroyphenyloxamate ligand and we have observed the formation of two atypical structures for phenyloxamate-related chemistry: a hexametallic macrocyclic coordination ring and of a chiral coordination polymer.…”