Structure prediction of neutral physiological copper(II) compounds with l-cysteine and l-histidine

Fabrication of a Reusable Carbon Dot/Gold Nanoparticle/Metal–Organic Framework Film for Fluorescence Detection of Lead Ions in Water

“…The response of HS-C/Au(1.4)/UiO-66 film to 10 ppb Pb 2+ in the presence of the co-ions may be explained in terms of the faster diffusion of Pb 2+ to the adsorption site compared to other ions due to the smaller hydration diameter of Pb 2+ and its higher ionic mobility based on the Stokes’ law. , Additionally, the high selectivity of HS-C/Au(1.4)/UiO-66 to Pb 2+ over Cu 2+ , Zn 2+ , and Ca 2+ is due to the stronger coordination bonding between Pb 2+ and thiol ligands. Theoretical studies have suggested that Pb 2+ demonstrates stronger orbital interactions with thiol ligands due to its accessible orbitals; Pb 2+ has accessible 6p orbitals for stronger coordination but Zn 2+ and Cu 2+ exhibit less covalent characteristics. − Besides, the emission of the HS-C/Au(1.4)/UiO-66 film was significantly quenched as shown in Figure S9d after dipping in tap water that contains a complex mixture of different metal ions that are indicated in Figure S9e. The concentrations of the ions in the tap water sample were determined using inductively coupled plasma-optical emission spectrometry.…”

Green Synthesis of Metal-Organic Biohybrid (Mob) Nanomaterials

“…However, the oxidation states of copper and cobalt used here were in the +2 state at the beginning of synthesis, and all metal salts were in the sulfate form. Copper, having possible oxidation states of +2 and +1, is known to bind to cystine and cysteine [31,32], and under the reducing conditions of sodium hydroxide used here [10], cystine or cysteine could bind to copper via deprotonated carboxylate groups [33]. This could lead to a Cu(Cys) 2 form, as suggested for cysteine [33].…”

“…Copper, having possible oxidation states of +2 and +1, is known to bind to cystine and cysteine [31,32], and under the reducing conditions of sodium hydroxide used here [10], cystine or cysteine could bind to copper via deprotonated carboxylate groups [33]. This could lead to a Cu(Cys) 2 form, as suggested for cysteine [33]. Here, since we utilized cystine, a Cu(Cys) 2 with Cys being the dimer cystine, could provide a mechanism whereby CuHARS are formed and generate the highly elongated (high-aspect ratio) structures we have shown.…”

“…Here, since we utilized cystine, a Cu(Cys) 2 with Cys being the dimer cystine, could provide a mechanism whereby CuHARS are formed and generate the highly elongated (high-aspect ratio) structures we have shown. However, since cystine also contains sulfur, if thiol groups are deprotonated as is suggested for cysteine [33], copper binding to sulfur may be preferred over carboxylate. Thus, we suggest here a mechanism for CuHARS formation whereby copper competes with both sulfur and carboxylate groups of cystine, and this provides length (elongation), and width (3-dimensionality) for the growing CuHARS.…”

What kind of interactions we may get moving from zwitter to “dritter” ions: C–O⋯Re(O4) and Re–O⋯Re(O4) anion⋯anion interactions make structural difference between l-histidinium perrhenate and pertechnetate

“…25 For this reason, the synthesis and study of the structural features of new compounds based on histidine are promising for the creation of new medical drugs, toxicological studies and many other areas of medicine. 26 Also, this study may bring new understanding of chemical bonding options. Thus, in the case of effective binding with ReO 4 − or TcO 4 − , they can be promising deliverers of rhenium to the cells of organs and tissues.…”