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Title: Direct Identification of Mixed-Metal Centers in Metal–Organic Frameworks: Cu3(BTC)2 Transmetalated with Rh2+ Ions

Journal Article · · Journal of Physical Chemistry Letters
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  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Stony Brook Univ., NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Raman spectroscopy was used to establish direct evidence of heterometallic metal centers in a metal–organic framework (MOF). The Cu3(BTC)2 MOF HKUST-1 (BTC3– = benzenetricarboxylate) was transmetalated by heating it in a solution of RhCl3 to substitute Rh2+ ions for Cu2+ ions in the dinuclear paddlewheel nodes of the framework. In addition to the Cu–Cu and Rh–Rh stretching modes, Raman spectra of (CuxRh1–x)3(BTC)2 show the Cu–Rh stretching mode, indicating that mixed-metal Cu–Rh nodes are formed after transmetalation. Density functional theory studies confirmed the assignment of a Raman peak at 285 cm–1 to the Cu–Rh stretching vibration. Electron paramagnetic resonance spectroscopy experiments further supported the conclusion that Rh2+ ions are substituted into the paddlewheel nodes of Cu3(BTC)2 to form an isostructural heterometallic MOF, and electron microscopy studies showed that Rh and Cu are homogeneously distributed in (CuxRh1–x)3(BTC)2 on the nanoscale.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0019360; SC0001004
OSTI ID:
1716757
Report Number(s):
BNL-220600-2020-JAAM
Journal Information:
Journal of Physical Chemistry Letters, Vol. 11, Issue 19; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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