Reaction of gold nanoparticles with tetracyanoquinoidal molecules. Spectrophotometric determination of the Au0 content of gold nanoparticles.
The interaction of gold nanoparticles (AuNPs) and typical tetracyanoquinoidal compounds such as bis(dicyanomethylene)-bithiophene and tetracyanoquinodimethane (TCNQ) has been investigated. AuNPs in toluene solution reduce the tetracyano compounds to the radical anion, as shown by UV-vis spectroscopy. The reaction, promoted by the bromide anion used as a stabilizer for AuNPs, involves in the case of TCNQ the total amount of Au(0) in the nanoparticles. A spectrophotometric method for the evaluation of the Au(0) content of capped AuNPs in organic solution has been established and successfully applied to the analysis of dodecanethiol-capped AuNPs.
Zotti
Gianni
G
Istituto CNR per l'Energetica e le Interfasi, c.o Stati Uniti 4, 35127 Padova, Italy. g.zotti@ieni.cnr.it
Vercelli
Barbara
B
Berlin
Anna
A
D000838:Anions; D001965:Bromides / Q000737:chemistry; D004563:Electrochemistry; D006046:Gold / Q000032:analysis* / Q000737:chemistry; D053768:Metal Nanoparticles / Q000032:analysis* / Q000737:chemistry; D009570:Nitriles / Q000737:chemistry*; D011809:Quinones / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013876:Thiophenes / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry
D000838:Anions; D001965:Bromides; D009570:Nitriles; D011809:Quinones; D012996:Solutions; D013438:Sulfhydryl Compounds; D013876:Thiophenes; C013703:tetracyanoquinodimethane; D014050:Toluene; D006046:Gold