《Two Octanuclear {Cu4Ln4} (Ln = Dy or Tb) Complexes with a Butterfly-Shaped Unit Exhibiting Zero-Field Single-Molecule Magnet Behavior》 was published in Inorganic Chemistry in 2020. These research results belong to Zhao, Xiaoxi; Li, Ge; Ma, Jingjing; Liu, Weisheng. Category: esters-buliding-blocks The article mentions the following:
One-pot reaction of an asym. acylhydrazone ligand H3L with Ln(ClO4)3 and CuCl2 in MeOH and MeCN solvents resulted in two novel octanuclear complexes, [Cu4Dy4L4Cl6(MeOH)8(H2O)4]·Cl2(MeOH)9(H2O)3 (1) and [Cu4Tb4L4Cl6(MeOH)2(H2O)10]·Cl2(H2O)x (2). Single-crystal x-ray diffraction studies revealed that these two complexes are isostructural and can be viewed as being built from two {Cu2Ln2L2} (Ln = Dy or Tb) butterfly-shaped units. D.c. magnetic susceptibilities and field-dependent magnetization measurements demonstrated the presence of strong ferromagnetic interaction between CuII and LnIII and magnetic anisotropy. Also, a.c. (a.c.) magnetic measurements illustrate that these two complexes show temperature- and frequency-dependent signals in the out-of-phase a.c. susceptibility under zero applied field, which are typical features of the slow relaxation of the magnetization for 1 and 2. The effective energy barrier (Ueff) for 1 was 54 K, which is one of the highest Ueff values yet reported for CuII/LnIII single-mol. magnets. An asym. acylhydrazone ligand H3L with two coordination pockets was synthesized to construct two novel 3d-4f octanuclear {Cu4Ln4L4} [Ln = Dy 1 or Tb 2 ] complexes with a butterfly-shaped unit. Meanwhile, 1 and 2 exhibited temperature- and frequency-dependent signals in the out-of-phase a.c. susceptibility under zero applied field, which indicated they exhibited typical single-mol. magnet behavior, resulting in an energy barrier (Ueff) for 1 of 54 K. 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. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics