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Mixed‐Valence Cu I /Cu III Metal–Organic Frameworks with Non‐innocent Ligand for Multielectron Transfer

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [1];  [6];  [5];  [2];  [1];  [7]
  1. Department of Chemical Engineering Hierarchical Green-Energy Materials (Hi-GEM) Research Center National Cheng Kung University Tainan City 70101 Taiwan
  2. Department of Chemistry Tamkang University New Taipei City 25137 Taiwan
  3. Chemical Sciences Division Oak Ridge National Laboratory P.O. Box 2008 Oak Ridge TN 37831 USA
  4. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan
  5. Core Facility Center National Cheng Kung University Tainan City 70101 Taiwan
  6. Department of Chemistry National Tsing Hua University Hsinchu 300-044 Taiwan
  7. School of Pharmacy, College of Medicine National Cheng Kung University Tainan City 70101 Taiwan

Abstract

We report two novel three‐dimensional copper‐benzoquinoid metal–organic frameworks (MOFs), [Cu 4 L 3 ] n and [Cu 4 L 3  ⋅ Cu(iq) 3 ] n (LH 4 =1,4‐dicyano‐2,3,5,6‐tetrahydroxybenzene, iq=isoquinoline). Spectroscopic techniques and computational studies reveal the unprecedented mixed valency in MOFs, formal Cu(I)/Cu(III). This is the first time that formally Cu(III) species are witnessed in metal–organic extended solids. The coordination between the mixed‐valence metal and redox‐non‐innocent ligand L, which promotes through‐bond charge transfer between Cu metal sites, allows better metal‐ligand orbital overlap of the d‐π conjugation, leading to strong long‐range delocalization and semiconducting behavior. Our findings highlight the significance of the unique mixed valency between formal Cu(I) and highly‐covalent Cu(III), non‐innocent ligand, and pore environments of these bench stable Cu(III)‐containing frameworks on multielectron transfer and electrochemical properties.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2005002
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 50 Vol. 62; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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