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Cyclophanes as Platforms for Reactive Multimetallic Complexes.

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Designed multimetallic compounds with engineered ligands activate small molecules like O2 and CO2, showing unique reactivity compared to simpler metal clusters. These systems offer insights into programmed cooperativity and substrate control in catalysis.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Multimetallic cofactors in metalloproteins catalyze crucial small molecule activation reactions (N2, O2, CO2) essential for biogeochemical cycles.
  • Proposed mechanisms for these cofactors involve cooperative pathways with distributed oxidation states and metal-ligand orbital overlap.
  • Understanding and replicating cooperative effects in synthetic homogeneous systems remains a challenge.

Purpose of the Study:

  • To design, synthesize, and evaluate the reactivity of polynuclear metal compounds using engineered organic ligands.
  • To explore small molecule activation by trimetallic cyclophanates, focusing on programmed cooperativity.
  • To investigate the role of ligand design in controlling metal nuclearity, coordination environment, and substrate interactions.

Main Methods:

  • Synthesis of trimetallic cyclophanate complexes with controlled metal nuclearity and coordination environments.
  • Evaluation of small molecule activation (O2, CO2) reactivity of these designed multimetallic compounds.
  • Comparison of reactivity between designed multimetallic systems and self-assembled monometallic precursors.

Main Results:

  • Trimetallic cyclophanates exhibit distinct reactivity outcomes in small molecule activation compared to monometallic aggregates.
  • Dinitrogen-tricopper(I) cyclophanate shows unique reactions with dioxygen, differing from monocopper compounds.
  • Trimetallic compounds catalyze CO2 reduction to oxalate (a one-electron process) and trimetallic trihydride clusters show CO2 specificity and water stability.

Conclusions:

  • Engineered organic ligands can control metal nuclearity and coordination, enabling programmed cooperativity in synthetic multimetallic catalysts.
  • Designed multimetallic systems demonstrate enhanced reactivity and substrate control compared to self-assembled systems.
  • These findings highlight the potential of weak-field metal clusters in facilitating both one-electron and multielectron redox transformations.