Coordination environment of copper (<scp>II</scp>) during the sol–gel process of an aminated alkoxide

Kłonkowski, Andrzej M.; Koehler, K.; Widernik, Teresa; Grobelna, Beata

doi:10.1039/jm9960600579

Cited by 16 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…22,23,31,32,43,44 Mono (1:1) and bis (1:2) complexes have been noted, with monocomplexes favored at low surface coverage. 22,23,31,32,43,44 Formation of tris from bis complexes is not likely given that log K 3 = −1, 31,45 while log K 1 = ∼11 and log K 2 = ∼10.…”

Section: ■ Experimental Sectionmentioning

confidence: 96%

Chelation Gradients for Investigation of Metal Ion Binding at Silica Surfaces

2014

View full text Add to dashboard Cite

Centimeter-long surface gradients in bi- and tridentate chelating agents have been formed via controlled rate infusion, and the coordination of Cu(2+) and Zn(2+) to these surfaces has been examined as a function of distance by X-ray photoelectron spectroscopy (XPS). 3-(Trimethoxysilylpropyl)ethylenediamine and 3-(trimethoxysilylpropyl)diethylenetriamine were used as precursor silanes to form the chelation gradients. When the gradients were exposed to a metal ion solution, a series of coordination complexes formed along the length of the substrate. For both chelating agents at the three different concentrations studied, the amine content gradually increased from top to bottom as expected for a surface chemical gradient. While the Cu 2p peak area had nearly the same profile as nitrogen, the Zn 2p peak area did not and exhibited a plateau along much of the gradient. The normalized nitrogen-to-metal peak area ratio (N/M) was found to be highly dependent on the type of ligand, its surface concentration, and the type of metal ion. For Cu(2+), the N/M ratio ranged from 8 to 11 on the diamine gradient and was ∼4 on the triamine gradient, while for Zn(2+), the N/M ratio was 4-8 on diamine and 5-7 on triamine gradients. The extent of protonation of amine groups was higher for the diamine gradients, which could lead to an increased N/M ratio. Both 1:1 and 1:2 ligand/metal complexes along with dinuclear complexes are proposed to form, with their relative amounts dependent on the ligand, ligand density, and metal ion. Collectively, the methods and results described herein represent a new approach to study metal ion binding and coordination on surfaces, which is especially important to the extraction, preconcentration, and separation of metal ions.

show abstract

Section: ■ Experimental Sectionmentioning

confidence: 96%

Chelation Gradients for Investigation of Metal Ion Binding at Silica Surfaces

2014

View full text Add to dashboard Cite

show abstract

“…The first peak occurs at ∼ 75 • C where the P-I system lost 2 -3.5 % of its initial weight. This is attributed to loss of physisorbed water and alcohol from the system pores [11,[24][25][26]. The second peak at ∼ 350 • C, where the P-I system lost 34.5 %, is probably due to degradation of organofunctional groups bound to silicon atoms as well as dehydroxylation of suface OH groups and loss of internal water and alcohol from silica.…”

Section: Thermal Analysismentioning

confidence: 99%

“…7). The two peaks at 230 • C and 300 • C are probably due to further loss of internal alcohol, degradation of surface OH silica groups, and degradation of CTAB [24][25][26]. The total loss of weight for P-I/CTAB was 53.5 %.…”

Section: Thermal Analysismentioning

confidence: 99%

“…The second peak at ∼ 350 • C, where the P-I system lost 34.5 %, is probably due to degradation of organofunctional groups bound to silicon atoms as well as dehydroxylation of suface OH groups and loss of internal water and alcohol from silica. The third broad peak at temperature 400-600 • C is due to further loss of 6 % of the initial weight due to condensation and loss of hydroxyl groups forming siloxane bonds (dehydroxylation) [24][25][26]. The total loss of weight of the P-I system was about 41.5 %.…”

Section: Thermal Analysismentioning

confidence: 99%

See 1 more Smart Citation

Template Synthesis of Iminodiacetic Acid Polysiloxane Immobilized Ligand Systems and their Metal Uptake Capacity

El‐Ashgar

Silmi

El‐Nahhal

et al. 2015

Silicon

View full text Add to dashboard Cite

Porous solid polysiloxane ligand systems bearing an iminodiacetic acid chelating ligand of the general formula P-IDA (where P-represents [Si-O] n polysiloxane network and IDA represent an organofunctional group) were achieved in a two-step reaction. The first step includes a template synthesis of 3-iodopropylpolysiloxane (P-I) or 3-aminopropylpolysiloxane (P-MA) by hydrolytic polycondensation of TEOS and the corresponding silane agent in the presence of CTAB as a surfactant. The second step includes a modification of 3-iodopropylpolysiloxane with diethyliminodiacetate or 3-aminopropylpolysiloxane with ethylchloroacetate to produce IDA-functionalized polysiloxane ligand systems P-IDA-I & P-IDA-II respectively. It was found that the modified IDA-functionalized polysiloxane ligand systems exhibited higher capacities for uptake of the metal ions (Ni 2+ , Cu 2+ and Pb 2+ ) than those prepared without surfactants.

show abstract

“…The faster hydrolysis reaction and slower condensation reaction of a silica precursor, i.e., tetraethoxysilane (TEOS) is possible thanks to the addition of ammonia as a catalyst. The addition of ammonia favors the obtaining of the final product of a silica shell with high porosity and surface area [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

New Core-Shell Nanostructures for FRET Studies: Synthesis, Characterization, and Quantitative Analysis

Synak

Adamska

Kułak

et al. 2022

IJMS

Self Cite

View full text Add to dashboard Cite

This work describes the synthesis and characterization of new core-shell material designed for Förster resonance energy transfer (FRET) studies. Synthesis, structural and optical properties of core-shell nanostructures with a large number of two kinds of fluorophores bound to the shell are presented. As fluorophores, strongly fluorescent rhodamine 101 and rhodamine 110 chloride were selected. The dyes exhibit significant spectral overlap between acceptor absorption and donor emission spectra, which enables effective FRET. Core-shell nanoparticles strongly differing in the ratio of donors to acceptor numbers were prepared. This leads to two different interesting cases: typical single-step FRET or multistep energy migration preceding FRET. The single-step FRET model that was designed and presented by some of us recently for core-shell nanoparticles is herein experimentally verified. Very good agreement between the analytical expression for donor fluorescence intensity decay and experimental data was obtained, which confirmed the correctness of the model. Multistep energy migration between donors preceding the final transfer to the acceptor can also be successfully described. In this case, however, experimental data are compared with the results of Monte Carlo simulations, as there is no respective analytical expression. Excellent agreement in this more general case evidences the usefulness of this numerical method in the design and prediction of the properties of the synthesized core-shell nanoparticles labelled with multiple and chemically different fluorophores.

show abstract

Coordination environment of copper (II) during the sol–gel process of an aminated alkoxide

Abstract: Copper (11) complexes with N-2-aminoethyl-3-aminopropyltrimethoxysilane (N-N) as an ethylenediamine analogue were analysed prior to the sol-gel process, during the reaction (N-N + tetramethoxysilane) with water and in the gel products, to

Cited by 16 publications

References 16 publications

Chelation Gradients for Investigation of Metal Ion Binding at Silica Surfaces

Chelation Gradients for Investigation of Metal Ion Binding at Silica Surfaces

Template Synthesis of Iminodiacetic Acid Polysiloxane Immobilized Ligand Systems and their Metal Uptake Capacity

New Core-Shell Nanostructures for FRET Studies: Synthesis, Characterization, and Quantitative Analysis

Contact Info

Product

Resources

About