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3 results on '"Daghetta M"'

1. Cooperative effects of electron donors and acceptors for the stabilization of elusive metal cluster frameworks: synthesis and solid-state structures of [Pt19(CO)24(μ4-AuPPh3)3]- and [Pt19(CO)24{μ4-Au2(PPh3)2}2].

Author

Ceriotti A, Macchi P, Sironi A, El Afefey S, Daghetta M, Fedi S, de Biani FF, and Della Pergola R

Subjects
Crystallography, X-Ray, Electrons, Models, Molecular, Molecular Structure, Carbon Monoxide chemistry, Gold chemistry, Organometallic Compounds chemical synthesis, Organometallic Compounds chemistry, Organophosphorus Compounds chemistry, Platinum chemistry
Abstract

The anionic cluster [Pt(19)(CO)(22)](4-) (1), of pentagonal symmetry, reacts with CO and AuPPh(3)(+) fragments. Upon increasing the Au:Pt(19) molar ratio, different species are sequentially formed, but only the last two members of the series could be characterized by X-ray diffraction, namely, [Pt(19)(CO)(24)(μ(4)-AuPPh(3))(3)](-) (2) and [Pt(19)(CO)(24){μ(4)-Au(2)(PPh(3))(2)}(2)] (3). The metallic framework of the starting cluster is completely modified after the addition of CO and AuL(+), and both products display the same platinum core of trigonal symmetry, with closely packed metal atoms. The three AuL(+) units cap three different square faces in 2, whereas four AuL(+) fragments are grouped in two independent bimetallic units in the neutral cluster 3. Electrochemical and spectroelectrochemical studies on 2 showed that its redox ability is comparable with that of the homometallic 1.

Published
2013
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2. AuPPh3 fragment as Pt carbonyl cluster stabilizer

Author

El Afefey, S, Ceriotti, A, Daghetta, M, Zanello, P, Fedi, S, Macchi, P, DELLA PERGOLA, ROBERTO, SIRONI, ANNALISA, El Afefey, S, Ceriotti, A, Daghetta, M, Zanello, P, Fedi, S, Macchi, P, DELLA PERGOLA, R, and Sironi, A

Subjects
CHIM/03 - CHIMICA GENERALE E INORGANICA, electrochemistry, platinum, gold, heterometallic cluster, transition metals
Published
2010

3. Cooperative Effects of Electron Donors and Acceptors for the Stabilization of Elusive Metal Cluster Frameworks: Synthesis and Solid-State Structures of [Pt19(CO)24(μ4-AuPPh3)3]−and [Pt19(CO)24{μ4-Au2(PPh3)2}2]

Author

Alessandro, Ceriotti, Piero, Macchi, Annalisa, Sironi, Simona, El Afefey, Matteo, Daghetta, Serena, Fedi, Fabrizia Fabrizi, de Biani, Roberto, Della Pergola, Ceriotti, A, Macchi, P, Sironi, A, El Afefey, S, Daghetta, M, Fedi, S, Fabrizi de Biani, F, and DELLA PERGOLA, R

Subjects
Models, Molecular, CHIM/03 - CHIMICA GENERALE E INORGANICA, Carbon Monoxide, metal nanoparticle, Molecular Structure, Electrons, solid state structure, Crystallography, X-Ray, heterometallic cluster, Inorganic Chemistry, Organophosphorus Compounds, electrochemistry, Organometallic Compounds, Physical and Theoretical Chemistry, Gold, Platinum
Abstract

The anionic cluster [Pt(19)(CO)(22)](4-) (1), of pentagonal symmetry, reacts with CO and AuPPh(3)(+) fragments. Upon increasing the Au:Pt(19) molar ratio, different species are sequentially formed, but only the last two members of the series could be characterized by X-ray diffraction, namely, [Pt(19)(CO)(24)(μ(4)-AuPPh(3))(3)](-) (2) and [Pt(19)(CO)(24){μ(4)-Au(2)(PPh(3))(2)}(2)] (3). The metallic framework of the starting cluster is completely modified after the addition of CO and AuL(+), and both products display the same platinum core of trigonal symmetry, with closely packed metal atoms. The three AuL(+) units cap three different square faces in 2, whereas four AuL(+) fragments are grouped in two independent bimetallic units in the neutral cluster 3. Electrochemical and spectroelectrochemical studies on 2 showed that its redox ability is comparable with that of the homometallic 1.

Published
2013

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