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Inatomi A, Abe M, Hisaeda Y. Oxo-Centred Trimetallic Clusters Supported by Electron-Withdrawing Carboxylates: Highly Inert Character in Ligand Exchange Kinetics of the Dichloroacetate-Bridged Complex [Ru3(µ3-O)(µ-CHCl2COO)6(pyridine)3]. Aust J Chem 2012. [DOI: 10.1071/ch12378] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Two new oxo-centred trinuclear ruthenium clusters supported by six dichloroacetate ligands, [Ru3(μ3-O)(μ-CHCl2COO)6(CH3OH)3]CHCl2COO (1) and [Ru3(μ3-O)(μ-CHCl2COO)6(pyridine)3] (2), have been synthesised and characterised by spectroscopic methods, electrospray ionisation mass spectrometry, single-crystal X-ray diffraction, and cyclic voltammetry. Due to the strong inductive effect of the dichloroacetate ligands, the redox potential of 2 was shifted to the positive side (~1.0 V or more) relative to the acetate analogue [Ru3(μ3-O)(μ-CH3COO)6(pyridine)3], and also the rate of pyridine/pyridine-d5 exchange reaction of 2 in CD3CN was retarded with the rate constant of kex298 K = 1.9 × 10–8 s–1 which is 105-fold smaller than the value for [Ru3(μ3-O)(μ-CH3COO)6(pyridine)3]. Highly positive activation parameters obtained for 2, ΔH‡ = 138 ± 7 kJ mol–1 and ΔS‡ = 71 ± 20 J K–1 mol–1, illustrate a dissociative activation pathway in which rupture of the Ru–N(pyridine) bond is involved in the rate-determining step.
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Inatomi A, Abe M, Hisaeda Y. Carboxylato‐Modified New Oxo‐Centred Triruthenium Cluster Compounds with CO and Solvent Ligands: The X‐ray Structure of [Ru
3
O(C
2
H
5
CO
2
)
6
(CO)(THF)
2
]. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900701] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Atsushi Inatomi
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Nishi‐ku, Fukuoka 819‐0395, Japan, Fax: +81‐92‐802‐2828
| | - Masaaki Abe
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Nishi‐ku, Fukuoka 819‐0395, Japan, Fax: +81‐92‐802‐2828
| | - Yoshio Hisaeda
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Nishi‐ku, Fukuoka 819‐0395, Japan, Fax: +81‐92‐802‐2828
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