Tag: 0-100

On October 18, 2021, Uzal-Varela, Rocio; Valencia, Laura; Lalli, Daniela; Maneiro, Marcelino; Esteban-Gomez, David; Platas-Iglesias, Carlos; Botta, Mauro; Rodriguez-Rodriguez, Aurora published an article.Application of 79-07-2 The title of the article was Understanding the Effect of the Electron Spin Relaxation on the Relaxivities of Mn(II) Complexes with Triazacyclononane Derivatives. And the article contained the following:

Investigating the relaxation of water 1H nuclei induced by paramagnetic Mn(II) complexes is important to understand the mechanisms that control the efficiency of contrast agents used in diagnostic magnetic resonance imaging (MRI). Herein, a series of potentially hexadentate triazacyclononane (TACN) derivatives containing different pendant arms were designed to explore the relaxation of the electron spin in the corresponding Mn(II) complexes using a combination of 1H NMR relaxometry and theor. calculations These ligands include 1,4,7-triazacyclononane-1,4,7-triacetic acid (H3NOTA) and three derivatives in which an acetate group is replaced by sulfonamide (H3NO2ASAm), amide (H2NO2AM) or pyridyl (H2NO2APy) pendants, resp. The analog of H3NOTA containing three propionate pendant arms (H3NOTPrA) was also investigated. The x-ray structure of the derivative containing two acetate groups and a sulfonamide pendant arm [Mn(NO2ASAm)]- evidenced six-coordination of the ligand to the metal ion, with the coordination polyhedron being close to a trigonal prism. The relaxivities of all complexes at 20 MHz and 25° (1.1-1.3 mM-1 s-1) are typical of systems that lack water mols. coordinated to the metal ion. The nuclear magnetic relaxation profiles evidence significant differences in the relaxivities of the complexes at low fields (<1 MHz), which are associated with different spin relaxation rates. The zero field splitting (ZFS) parameters calculated using DFT and CASSCF methods show that electronic relaxation is relatively insensitive to the nature of the donor atoms. However, the twist angle of the two tripodal faces that delineate the coordination polyhedron, defined by the N atoms of the TACN unit (lower face) and the donor atoms of the pendant arms (upper face), has an important effect in the ZFS parameters. A twist angle close to the ideal value for an octahedral coordination (60°), such as that in [Mn(NOTPrA)]-, leads to a small ZFS energy, whereas this value increases as the coordination polyhedron approaches to a trigonal prism. The experimental process involved the reaction of 2-Chloroacetamide(cas: 79-07-2).Application of 79-07-2

The Article related to amido pyridyl triazacyclononanetriacetate manganese complex preparation spin relaxation relaxivity, crystal mol structure manganese trifluoromethylphenylsulfonamido triazacyclononane complex, electrochem redox triazacyclononane manganese complex and other aspects.Application of 79-07-2

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics

Knippen, Katharina; Bredenkoetter, Bjoern; Kanschat, Lisa; Kraft, Maryana; Vermeyen, Tom; Herrebout, Wouter; Sugimoto, Kunihisa; Bultinck, Patrick; Volkmer, Dirk published an article in 2020, the title of the article was CFA-18: a homochiral metal-organic framework (MOF) constructed from rigid enantiopure bistriazolate linker molecules.COA of Formula: C2H4ClNO And the article contains the following content:

In this work, authors introduce the first enantiopure bistriazolate-based metal-organic framework, CFA-18 (Coordination Framework Augsburg-18), built from the R-enantiomer of 7,7,7′,7′-tetramethyl-6,6′,7,7′-tetrahydro-3H,3’H-5,5′-spirobi[indeno[5,6-d]-[1,2,3]triazole] (H2-spirta). The enantiopurity and absolute configuration of the new linker were confirmed by several chiroselective methods. Reacting H2-spirta in hot N,N-dimethylformamide (DMF) with manganese(II) chloride gave CFA-18 as colorless crystals. The crystal structure with the composition [Mn2Cl2(spirta)(DMF)2] was solved using synchrotron single-crystal x-ray diffraction. CFA-18 shows a framework topol. that is closely related to previously reported metal-azolate framework (MAF) structures in which the octahedrally coordinated manganese(II) ions are triazolate moieties, and the chloride anions form crosslinked one-dimensional helical chains, giving rise to hexagonal channels. In contrast to MAFs crystallizing in the centrosym. space group R3, the handedness of the helixes found in CFA-18 is strictly uniform, leading to a homochiral framework that crystallizes in the trigonal crystal system within the chiral space group P3121 (number 152). The experimental process involved the reaction of 2-Chloroacetamide(cas: 79-07-2).COA of Formula: C2H4ClNO

The Article related to tetramethyltetrahydrospiro biindenediol homochiral metal organic framework preparation crystal structure, mof rigid enantiopure bistriazolate linker mol preparation crystal structure, manganese tetramethyltetrahydrospiro biindenediol homochiral metal organic framework preparation structure and other aspects.COA of Formula: C2H4ClNO

Referemce:
Amide – Wikipedia,
Amide – an overview | ScienceDirect Topics