Controlling gold nanoclusters by diphospine ligands.
J Am Chem Soc
; 136(1): 92-5, 2014 Jan 08.
Article
em En
| MEDLINE
| ID: mdl-24351099
ABSTRACT
We report the synthesis and structure determination of a new Au22 nanocluster coordinated by six bidentate diphosphine ligands 1,8-bis(diphenylphosphino) octane (L(8) for short). Single crystal X-ray crystallography and electrospray ionization mass spectrometry show that the cluster assembly is neutral and can be formulated as Au22(L(8))6. The Au22 core consists of two Au11 units clipped together by four L(8) ligands, while the additional two ligands coordinate to each Au11 unit in a bidentate fashion. Eight gold atoms at the interface of the two Au11 units are not coordinated by any ligands. Four short gold-gold distances (2.64-2.65 Å) are observed at the interface of the two Au11 clusters as a result of the clamping force of the four clipping ligands and strong electronic interactions. The eight uncoordinated surface gold atoms in the Au22(L(8))6 nanocluster are unprecedented in atom-precise gold nanoparticles and can be considered as potential in situ active sites for catalysis.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fosfinas
/
Nanopartículas Metálicas
/
Ouro
Idioma:
En
Revista:
J Am Chem Soc
Ano de publicação:
2014
Tipo de documento:
Article
País de afiliação:
Estados Unidos