Vibrational Modes and Terahertz Physical Phenomena Underpinning ZIF-71 Metal-Organic Framework

TL;DR

This study provides a comprehensive analysis of the vibrational modes and physical phenomena of ZIF-71, revealing low-energy collective modes and mechanical properties crucial for its stability and potential applications.

Contribution

It offers the first detailed characterization of ZIF-71's vibrational spectrum and structural dynamics using advanced spectroscopic techniques and theoretical calculations.

Findings

Identification of low-energy collective vibrational modes

Insights into framework stability and gate-opening mechanisms

Mechanical properties at the nanoscale

Abstract

The zeolitic imidazole framework ZIF-71 has the potential to outperform other well-studied metal-organic frameworks due to its intrinsic hydrophobicity and large pore size. However, a detailed description of its complex physical phenomena and structural dynamics has been lacking thus far. Herein, we elucidated all vibrational modes of ZIF-71 using high-resolution inelastic neutron scattering and synchrotron radiation infrared spectroscopy in conjunction with density functional theory calculations. We discover low-energy collective modes, such as gate-opening and shearing mechanisms that may affect the functions and framework stability of ZIF-71. Its single-crystal mechanical properties are further unraveled by nanoscale analytics.