Synthesis and supramolecular features of hybrid POM/onium solid-state assemblies
摘要:
Polyoxomolybdate-based organic-inorganic hybrid architectures were synthesised and characterised by X-ray crystallography. The supramolecular assemblies present rows of metallic clusters H-bonded by ammonium cations, with a 1:2 molybdate/ammonium ratio. The organic moieties of the ammonium cations establish hydrophobic contact among them such as van der Waals, C-HMIDLINE HORIZONTAL ELLIPSIS pi and pi MIDLINE HORIZONTAL ELLIPSIS pi interactions that stabilise the supramolecular architectures. In particular, for compound 5 the n-alkyl tails pack closely together giving a lipid-like bilayer. In compound 6, the aromatic phenyl rings of the organic cation allow the stabilisation of the supramolecular architecture by C-HMIDLINE HORIZONTAL ELLIPSIS pi and pi MIDLINE HORIZONTAL ELLIPSIS pi interactions. Regarding the X-ray structure of the compound 11, the tetraanionic octa-molybdate [Mo8O26](4-) cluster is surrounded by four ethyl-triphenyl-phosphonium cations. Running along the b-axis open channels are occupied by DMF solvent molecules. Interestingly, a soaking experiment in n-pentane with the corresponding crystals of compound 11 afforded to a crystal structure very different from the native one.
Rapid Thermodynamically Stable Complex Formation of [<sup>nat/111</sup>In]In<sup>3+</sup>, [<sup>nat/90</sup>Y]Y<sup>3+</sup>, and [<sup>nat/177</sup>Lu]Lu<sup>3+</sup> with H<sub>6</sub>dappa
作者:Thomas I. Kostelnik、Xiaozhu Wang、Lily Southcott、Hannah K. Wagner、Manja Kubeil、Holger Stephan、María de Guadalupe Jaraquemada-Peláez、Chris Orvig
DOI:10.1021/acs.inorgchem.0c00671
日期:2020.5.18
radiopharmaceuticals. Nuclear magnetic resonance (NMR) spectroscopy was employed to investigate the chelator coordination chemistry with a variety of nonradioactive trivalent metal ions (In3+, Lu3+, Y3+, Sc3+, La3+, Bi3+). Density functional theory (DFT) calculations explored the coordination environments of aforementioned metal complexes. The thermodynamic stability of H6dappa with four metal ions
[EN] PROCESS FOR PREPARING TRIENTINE DIHYDROCHLORIDE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DICHLORHYDRATE DE TRIENTINE
申请人:JOHNSON MATTHEY PLC
公开号:WO2021195671A1
公开(公告)日:2021-09-30
The present invention relates to a process for preparing trientine dihydrochloride as an active pharmaceutical ingredient (API). The present invention relates to a process for the preparation of trientine dihydrochloride with a pharmaceutical grade of purity. The invention also relates to novel intermediates used in the preparation of trientine dihydrochloride.
Process for preparing cephalosporins with salified intermediate
申请人:Monguzzi Riccardo
公开号:US20050119244A1
公开(公告)日:2005-06-02
Cephalosporins may be conveniently prepared by a process in which 7-ACA is silylated, acylated, desilylated and then salified to give an intermediate which is eventually cyclized with thiourea.