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Title: ZIF-8 Vibrational Spectra: Peak Assignments and Defect Signals

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4]; ORCiD logo [2]; ORCiD logo [5];  [5];  [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [1]
  1. Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Stony Brook Univ., NY (United States); Johns Hopkins Univ., Baltimore, MD (United States)
  4. Johns Hopkins Univ., Baltimore, MD (United States)
  5. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  6. Johns Hopkins Univ., Baltimore, MD (United States); Johns Hopkins Univ., Laurel, MD (United States)

In this study, Zeolitic Imidazolate Framework-8 (ZIF-8) is a promising material for gas separation applications. It also serves as a prototype for numerous ZIFs, including amorphous ones, with a broader range of possible applications, including sensors, catalysis, and lithography. It consists of zinc coordinated with 2-methylimidazolate (2mIm) and has been synthesized with methods ranging from liquid-phase to solvent-free synthesis, which aim to control its crystal size and shape, film thickness and microstructure, and incorporation into nanocomposites. Depending on the synthesis method and post-synthesis treatments, ZIF-8 materials may deviate from the nominal defect-free ZIF-8 crystal structure due to defects like missing 2mIm, missing zinc, and physically adsorbed 2mIm trapped in the ZIF-8 pores, which may alter its performance and stability. Infra-red (IR) spectroscopy has been used to assess the presence of defects in ZIF-8 and related materials. However, conflicting interpretations by various authors persist in the literature. Here, we systematically investigate ZIF-8 vibrational spectra by combining experimental IR spectroscopy and first-principles molecular dynamics simulations, focusing on assigning peaks and elucidating the spectroscopic signals of putative defects present in ZIF-8 material. We attempt to resolve conflicting assignments from the literature and to provide a comprehensive understanding of the vibrational spectra of ZIF-8 and its defect-induced variations, aiming towards more precise quality control and design of ZIF-8-based materials for emerging applications.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0012704; SC0021212; SC0021304; SC0021268
OSTI ID:
2372688
Report Number(s):
BNL--225697-2024-JAAM; {"","Journal ID: ISSN 1944-8244"}
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 21 Vol. 16; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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