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    • Keywords


      Metal-metal distances; clusters; ligand control; EHT calculations

    • Abstract


      Metal-metal distances in polynuclear metal complexes are often controlled by factors other than favourable metal-metal (M-M) interactions. Recently metal cluster topology has been identified as a major factor in controlling Cu-Cu distances in tetrahedral copper clusters. The more obvious ligand control in M-M distances was shown to play a secondary role. In order to probe ways to tune metal-metal distances in clusters, a study of clusters with similar ligands around the metal has been taken up. Two broad classes were identified: Clusters in which there are two-electron two-centre bonds, and a second class where multicentre multielectron bridging is involved.

      Clusters held together by two-electron two-centre bonds can be analysed fairly effectively using a test electrophile like the proton. This is illustrated by analysing structures available in the literature. The sensitivity of the method to detect M-M interactions will be illustrated with examples from gold clusters where relativistic interactions cause goldd10d10 interactions to be attractive. Among the latter class Cu3P6X2 core makes a specially interesting case study. The capping ligand X determines the extent of Cu-Cu interaction present in the cluster. Simple EHT calculations on the cluster reveal that Cu-Cu reduced overlap populations change significantly with the extent ofπ-donation or acceptance of the ligand.

    • Author Affiliations


      Santosh P Abraham1 Ashoka G Samuelson1

      1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012, India
    • Dates

  • Journal of Chemical Sciences | News

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      Posted on July 25, 2019

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