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Magic-number theories, developed to explain the anomalous stability of clusters in the gas phase, are being successfully applied to explain the stability of families of condensed phase Au clusters. To test the generalizability of these theories, we have synthesized a family of magic-numbered Ag clusters. Silver clusters ligated with glutathione (GSH) were synthesized by reduction of silver glutathiolate in water and then separated by polyacrylamide gel electrophoresis (PAGE). The raw synthetic product consisted of a family of discrete Ag:SG clusters, each forming a band in the PAGE gel. Varying reaction conditions changed the relative abundance of the family members but not their positions and colors within the gel, indicating the molecular precision of magic-number clusters. Absorption onsets for the most abundant clusters monotonically decreased with increasing cluster size, and spectra contained a small number of peaks that corresponded to single electron transitions. Although these Ag:SG clusters are related to Au:SG clusters, the distribution of cluster sizes and the optical absorption spectra were markedly different for the two families. This suggests that the Ag:SG clusters are not a simple extension of the Au:SG system, possibly due to differences in Au and Ag chemistry. Alternatively, condensed-phase magic-number cluster theories may need to be more complex than currently believed.
Department of Chemistry, The University of Toledo, Toledo, Ohio 43606, USA.
This article was published in the following journal.
Name: Journal of the American Chemical Society
A structure-determined silver nanocluster of [Ag10 (Eth)4 (CF3 COO)6 (CH3 OH)3 ]·3C-H3 OH (Eth = ethisterone) (1), is firstly demonstrated by self-assembly of silver salt and ethisterone. Due to the ...
A 64-nuclearity silver cluster encapsulating a unique POM anion [Mn(III)Mn(IV)2Mo14O56](17-) has been synthesized. The formation of the templating core performs a reassembly process for increasing nuc...
This research examined how variations in synthesis methods of silver nanoparticles affect both the release of silver from ceramic water filters (CWFs) and disinfection efficacy. The silver nanoparticl...
A gold(i)-silver(i) cluster bearing six carboxylate groups has been synthesized through the oxidation of its aldehyde precursor and the Au6 core of this cluster displays an octahedral or a trigonal pr...
The synthesis of chalcogena-silaaldehydes (Ch = S, Se, Te), 15, stabilized by interaction with N-heterocylic carbenes (NHCs) is reported. Compounds 15 are formed by reaction of the NHC-stabilized hydr...
This is a double-blind, placebo-controlled crossover study to evaluate the safety and efficacy of glutathione alone or glutathione, vitamin C and NAC treatment in children with autism who ...
Silver nitrate treatment of Bartholin's cyst or abscess will be compared to marsupialization treatment. It is expected that silver nitrate treatment is effective, simple, inexpensive and ...
This study is being conducted to test whether the use of diammine silver fluoride (also called silver diamine fluoride) hardens the cavity sufficiently so that it arrests.
This is a study to determine the safety and effectiveness of silver salt in Ariva® Silver Wintergreen Lozenge on discouraging smoking, by its imparting an unfavorable taste to the smoker ...
The purpose of this study is to determine whether oral topic silver nanoparticles are effective to reduce potential pathogen microbial loads in mechanical ventilation patients.
Inorganic compounds that contain silver as an integral part of the molecule.
Silver. An element with the atomic symbol Ag, atomic number 47, and atomic weight 107.87. It is a soft metal that is used medically in surgical instruments, dental prostheses, and alloys. Long-continued use of silver salts can lead to a form of poisoning known as ARGYRIA.
Compounds of silver and proteins used as topical anti-infective agents.
The use of silver, usually silver nitrate, as a reagent for producing contrast or coloration in tissue specimens.
Catalyzes the oxidation of GLUTATHIONE to GLUTATHIONE DISULFIDE in the presence of NADP+. Deficiency in the enzyme is associated with HEMOLYTIC ANEMIA. Formerly listed as EC 126.96.36.199.