Category: esters-buliding-blocksIn 2019 ,《Slow magnetic relaxation in mononuclear gadolinium(III) and dysprosium(III) oxamate complexes》 appeared in Polyhedron. The author of the article were da Cunha, Tamyris T.; Barbosa, Vitor M. M.; Oliveira, Willian X. C.; Pinheiro, Carlos B.; Pedroso, Emerson F.; Nunes, Wallace C.; Pereira, Cynthia L. M.. The article conveys some information:
A series of lanthanide(III) oxamate complexes of formula Na[Eu(4-HOpa)4(H2O)]•2H2O (1), Na[Gd(4-HOpa)4(H2O)]•2H2O (2), Na[Dy(4-HOpa)4(H2O)]•2H2O (3), and Na[Ho(4-HOpa)4(H2O)]•2H2O (4) (4-HOpa = N-4-hydroxyphenyloxamate) were synthesized and characterized. The crystal structures of complexes 1-4, as well as the oxamate ligand in the Et ester acid form (Et[4-HOpa]), were elucidated by single crystal X-ray diffraction. 1-4 are isostructural, and they crystallize in the P21/n space group of the monoclinic system. The crystal structures of 1-4 consist of mononuclear lanthanide(III) complex anions, [Ln(4-HOpa)4(H2O)]- (Ln = Eu3+, Gd3+, Dy3+, and Ho3+), coordinated sodium countercations, and crystallization water mols., resulting in a 2D NaILnIII supramol. coordination network. The coordination sphere of Ln3+ ions consists of square-face capped square antiprism (SAPRS-9). Magnetic properties were investigated for 1-4 in the 2-300 K temperature range using polycrystalline samples. Complex 2 exhibits an unusual and rare slow-relaxation of the magnetization for Gd3+ ions under DC applied field of 1.0 kOe, behaving as a field-induced single-ion magnet as occurs for the Dy3+ complex 3. The Eu3+ complex 1 has a nonmagnetic ground state, while the Ho3+ compound 4 behave as a paramagnet, and do not exhibit relaxation of the magnetization with or without an applied field. In the part of experimental materials, we found many familiar compounds, such as Ethyl oxalyl monochloride(cas: 4755-77-5Category: esters-buliding-blocks)
Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. Lacking the ability to form hydrogen bonds, acyl chlorides have lower boiling and melting points than similar carboxylic acids. For example, acetic acid boils at 118 °C, whereas acetyl chloride boils at 51 °C. Like most carbonyl compounds, infrared spectroscopy reveals a band near 1750 cm−1.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics