Crystal and molecular structure of chloroglycyl-dl-methioninatopalladium(II) monohydrate and its interaction with guanosine, cytidine and cytosine
摘要:
The crystal and molecular structure of the parent complex, chloroglycol-DL-methionatopalladium(II) monohydrate has been determined by X-ray diffraction analysis. Palladium has a square planar disposition in the complex and the deprotonated peptide moiety acts as a terdentate ligand and binds through N, O and S. The fourth coordination position on the metal ion is occupied by the chloride ion. The structure involves an extensive network of hydrogen bonds. Mixed ligand complexes of chloroglycl-DL-methionatopalladium(II) monohydrate with guanosine, cytosine and cytidine were synthesized and characterized by elemental analysis, conductivity measurements. IR and H-1 NMR spectral studies. In the case of guanosine, the metal coordinating site is N(7) whereas in cytosine and cytidine it is N(3).
two-fold excess of amines and ultrasonic influence increased yield of target products and reduced reaction time. The structures of the products were proved by two-dimensional correlation spectra of HSQC, HMBC, COSY, NOESY. A new efficient method for the synthesis of a large group of hybrid potentially biologically active compounds by condensation of methyl maleopimarate with various amines (glycine, β-alanine
Oxidation of methionine residue in Gly-Met dipeptide induced by [Au(en)Cl2]+ and influence of the chelated ligand on the rate of this redox process
作者:Biljana Đ. Glišić、Miloš I. Djuran、Zorka D. Stanić、Snežana Rajković
DOI:10.1007/s13404-013-0108-7
日期:2014.5
same process with previously investigated [AuCl4]− complex. Difference in the oxidation rate of Gly-Met between these two complexes was attributed to the presence of chelated ethylenediamine ligand in [Au(en)Cl2]+. The finding that the oxidation of sulfur-containing peptides and proteins can be inhibited by structural modifications of gold(III) complexes introducing polydentate nitrogen-containing ligands
A golf ball comprises a core, an outer cover layer, and, optionally, an intermediate layer disposed between the core and the outer cover layer. The outer cover layer may comprise a polyurethane or polyurea composition. At least one portion of the golf ball comprises a composition that enhances physical properties and/or performance characteristics (e.g., coefficient of restitution) of the golf ball. Preferably, the coefficient of restitution of the core is 0.8 or greater.
A golf ball comprises a core, an outer cover layer, and, optionally, an intermediate layer disposed between the core and the outer cover layer. The outer cover layer may comprise a polyurethane or polyurea composition. At least one portion of the golf ball comprises a composition that enhances physical properties and/or performance characteristics (e.g., coefficient of restitution) of the golf ball. Preferably, the coefficient of restitution of the core is 0.8 or greater.
A golf ball comprising a core and at least one layer disposed about the core, wherein at least one of the core or the layer is formed from a composition comprising a base polymer, a crosslink initiator, and an additive comprising an aromatic iodonium compound or an aromatic iodonium salt.