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VR 1.0
PT J
AU de Biani, FF
   Femoni, C
   Iapalucci, MC
   Longoni, G
   Zanello, P
   Ceriotti, A
TI Redox behavior of [H6-nNi38Pt6(CO)(48)](n-) (n=4-6) anions: A series of
   metal carbonyl clusters displaying electron-sink features
SO INORGANIC CHEMISTRY
VL 38
IS 16
BP 3721
EP 3724
PD AUG 9 1999
PY 1999
AB An investigation of the chemical and electrochemical redox behavior of
   the bimetallic [H6-nNi38Pt6 (CO)(48)](n-) (n = 4-6) clusters shows that
   they display electron-sink features encompassing up to six different
   oxidation states. As a corollary, these studies provide an indirect
   proof of the presence of hydride atoms where n = 4 and 5. The difference
   in the formal electrode potentials of consecutive redox couples of both
   [HNi38Pt6 (CO)(48)](5-) and [Ni38Pt6 (CO)(48)](6-) is almost constant
   and amounts on the average to ca. 0.33 and 0.28 V, respectively. Such
   constancy of Delta E within each species points out the absence of a
   well-defined HOMO-LUMO gap in both clusters. Besides, its value is an
   indication of their semiconductor rather than metallic nature. A plot of
   the average Delta E exhibited by the known carbonyl clusters displaying
   electrochemically reversible multiple redox changes versus their
   nuclearity suggests that the transition from semiconductor to metallic
   behavior might occur upon a ca. 50% increase of the today available
   cluster nuclearities.
TC 24
Z9 24
SN 0020-1669
UT WOS:000082017600023
ER

PT J
AU Sinzig, J
   de Jongh, LJ
   Ceriotti, A
   della Pergola, R
   Longoni, G
   Stener, M
   Albert, K
   Rosch, N
TI Molecular magnetic quantum dots in multivalent metal cluster compounds
SO PHYSICAL REVIEW LETTERS
VL 81
IS 15
BP 3211
EP 3214
DI 10.1103/PhysRevLett.81.3211
PD OCT 12 1998
PY 1998
AB In most magnetic molecular clusters studied so far, localized moments of
   metal ions are coupled by superexchange interactions via ligand atoms to
   yield the total moment of the cluster, which is basically a piece of a
   magnetic insulator. Here we present an experimental and theoretical
   study of another form of molecular magnetism, arising from unfilled
   molecular orbitals delocalized over the entire metal cores of molecular
   metal clusters. These cores thus act as nanosize quantum dots, in which
   the metal valence electrons are confined. [S0031-9007(98)07157-9].
TC 23
Z9 23
SN 0031-9007
UT WOS:000076369400041
ER

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