TY - JOUR
T1 - Isolated heterometallic Cr7Ni rings grafted on Au(111) surface
AU - Corradini, Valdis
AU - Biagi, Roberto
AU - Del Pennino, Umberto
AU - De Renzi, Valentina
AU - Gambardella, Alessandro
AU - Affronte, Marco
AU - Muryn, Christopher A.
AU - Timco, Grigore A.
AU - Winpenny, Richard E P
PY - 2007/6/11
Y1 - 2007/6/11
N2 - A study of the deposition of heterometallic antiferromagnetically coupled rings onto gold surfaces is reported. Two new {Cr7Ni} rings, [NH 2
nPr2][Cr7NiF8(3-tpc) 16] (1) (where 3-tpc = 3-thiophenecarboxylate) and [ nBuNH2CH2CH2SH] [Cr 7NiF8(O2CtBu)16] (2) have been made and structurally characterized. They have been deposited from the liquid phase on Au(111) and the adsorbed molecules compared by means of scanning tunneling microscopy (STM) and X-ray photoemission spectroscopy (XPS). In both cases a two-dimensional distribution of individually accessible {Cr 7Ni} heterometallic rings on the gold surface has been obtained, exploiting the direct grafting of sulfur-functionalized clusters. There is a competition between the chemisorption of the {Cr7Ni} clusters and a thiolic self-assembled monolayer (SAM) formed by free ligands. In 2, the presence of a single sulfur ligand should force the molecule to graft with the ring axis normal to the surface. The cluster stability in the STM images and the S-2p energy positions demonstrate, for both functionalizations, the strength of the grafting with the gold surface.
AB - A study of the deposition of heterometallic antiferromagnetically coupled rings onto gold surfaces is reported. Two new {Cr7Ni} rings, [NH 2
nPr2][Cr7NiF8(3-tpc) 16] (1) (where 3-tpc = 3-thiophenecarboxylate) and [ nBuNH2CH2CH2SH] [Cr 7NiF8(O2CtBu)16] (2) have been made and structurally characterized. They have been deposited from the liquid phase on Au(111) and the adsorbed molecules compared by means of scanning tunneling microscopy (STM) and X-ray photoemission spectroscopy (XPS). In both cases a two-dimensional distribution of individually accessible {Cr 7Ni} heterometallic rings on the gold surface has been obtained, exploiting the direct grafting of sulfur-functionalized clusters. There is a competition between the chemisorption of the {Cr7Ni} clusters and a thiolic self-assembled monolayer (SAM) formed by free ligands. In 2, the presence of a single sulfur ligand should force the molecule to graft with the ring axis normal to the surface. The cluster stability in the STM images and the S-2p energy positions demonstrate, for both functionalizations, the strength of the grafting with the gold surface.
UR - http://www.scopus.com/inward/record.url?scp=34347272285&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34347272285&partnerID=8YFLogxK
U2 - 10.1021/ic0624266
DO - 10.1021/ic0624266
M3 - Article
C2 - 17506551
AN - SCOPUS:34347272285
SN - 0020-1669
VL - 46
SP - 4937
EP - 4943
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 12
ER -