Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/4685
Title: Different bonding modes of the C-7 ring on iridium clusters. Synthesis, electrochemistry, and solid state structure of [Ir-6(CO)(13)(mu(3)-eta(2):eta(2):eta(2)-C7H8)], [Ir-6(CO)(12)(mu(3)-eta(2):eta(3):eta(2)-C7H7)](-), and [Ir-6(CO)(12)(mu(3)-eta(2):eta(2):eta(2)-C7H8)](2-)
Authors: Della Pergola, R.
Bianchi, A.
Fabrizi De Biani, Fabrizia 
Garlaschelli, L.
Manassero, M.
Sansoni, M.
Strumolo, D.
Zanello, Piero
Issue Date: 2002
Project: None 
Journal: ORGANOMETALLICS
Abstract: 
The cluster [Ir6(CO)13(C7H8)] (1) was synthesized from [Ir6(CO)16] and excess cycloheptatriene in refluxing toluene. In the solid state, the six iridium atoms define an octahedral metal cage, and one face is capped by the μ3-η2:η2:η2-C7H8 ligand, which is a six-electrondonor, through the three CC double bonds. Reaction of 1 with Na2CO3 in THF yields [Ir6(CO)12(C7H7)]- (2). In this octahedral anion, the cycloheptatrienyl ring is almost planar and is coordinated to a triangular face in the μ3-η2:η3:η2-fashion. Reaction of 1 or 2 with NaOH in THF yields [Ir6(CO)12(C7H8)]2- (3), in which a μ3-η2:η2:η2-C7H8 is also present. The 1H NMR spectra of 1 and 3 show five signals, which were assigned to the nonequivalent hydrogen atoms by bidimensional experiments. The spectrum of 2 shows a singlet, even at low temperature, in agreement with a highly fluxional ligand. The interconversions of 1 to the anions 2 and 3, respectively, have been followed by electrochemical investigations. The neutral [Ir6(CO)13(C7H8)] proves to undergo a two-electron reduction, which, being accompanied by decarbonylation, affords the dianion [Ir6(CO)12(C7H8)]2-. In turn, the latter undergoes a two-electron oxidation, which followed by deprotonation affords the monoanion [Ir6(CO)12(C7H7)]-.
Description: 
40267
URI: http://hdl.handle.net/20.500.12779/4685
ISSN: 0276-7333
DOI: 10.1021/om0204437
Appears in Collections:Publications

Show full item record

Page view(s)

14
Last Week
0
Last month
8
checked on May 5, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.