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Article Dans Une Revue Dalton Transactions Année : 2021

Intercluster exchanges leading to hydride-centered bimetallic clusters: a multi-NMR, X-ray crystallographic, and DFT study

Yu-Jie Zhong
Jian-Hong Liao
Tzu-Hao Chiu
Ying-Yann Wu
  • Fonction : Auteur
Samia Kahlal
C W Liu
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Résumé

Encouraged by the successful syntheses of alloy nanoclusters (or nanoparticles) via intercluster (or interparticle) reactions, herein we apply this methodology to prepare a series of bimetallic hydride clusters. Mixing of two clusters, [Ag7(H){E2P(OiPr)2}6] (E = S, 1; Se, 3) and [Cu7(H){E2P(OiPr)2}6] (E = S, 2; Se, 4), yields two series of hydride-centered bimetallic clusters, [CuxAg7-x(H){E2P(OiPr)2}6] (x = 0-7; E = S, 5; Se, 6). Their compositions are fully characterized by positive-mode ESI-MS spectrometry, multi-NMR spectroscopy, and the structures of [Cu6Ag(H){S2P(OiPr)2}6] (5a) and [CuAg6(H){Se2P(OiPr)2}6] (6a) by single crystal X-ray diffraction. The presence of individual compounds in solution is the result of a (dynamic) chemical equilibrium primarily driven by metal exchanges. In fact, the process of inter-cluster exchange of 1 and 2 leading to hydride-centered bimetallic clusters 5 can be monitored by concentration-dependent 31P NMR spectroscopy of which the higher concentration of 1 in the reaction, the closer to its resonance will be the distribution, in accord with Le Chatelier’s principle. The dynamic equilibrium is further confirmed by 2D exchange spectroscopy that reveals a stepwise process involving one metal exchange at a time. DFT calculations on a model series of clusters 6 show that silver prefers occupying the inner tetrahedral positions, while copper favors capping positions, in full agreement with the crystal structure of 5a and 6a.

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Chimie
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Dates et versions

hal-03194301 , version 1 (23-04-2021)

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Yu-Jie Zhong, Jian-Hong Liao, Tzu-Hao Chiu, Ying-Yann Wu, Samia Kahlal, et al.. Intercluster exchanges leading to hydride-centered bimetallic clusters: a multi-NMR, X-ray crystallographic, and DFT study. Dalton Transactions, 2021, 50 (13), pp.4727-4734. ⟨10.1039/d1dt00072a⟩. ⟨hal-03194301⟩
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