Uzal-Varela, Rocio; Valencia, Laura; Lalli, Daniela; Maneiro, Marcelino; Esteban-Gomez, David; Platas-Iglesias, Carlos; Botta, Mauro; Rodriguez-Rodriguez, Aurora published an article about the compound: Methyl 3-bromopropanoate( cas:3395-91-3,SMILESS:O=C(OC)CCBr ).Product Details of 3395-91-3. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3395-91-3) through the article.
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. When you point to this article, it is believed that you are also very interested in this compound(3395-91-3)Product Details of 3395-91-3 and due to space limitations, I can only present the most important information.
Reference:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem