Mechanism of dielectric screening in ZIF structures

Determine the underlying dielectric-screening mechanism of zeolitic imidazolate framework structures, including how the dense ZIF-zni framework produces its observed screening behavior.

Background

The paper reports that ZIF-zni has a calculated static dielectric constant of approximately 2.09, consistent with the experimentally measured value for a ZIF-zni pellet. The authors attribute the framework’s weak frequency-dependent screening in part to its dense, nominally nonporous structure, which restricts dipole reorientation.

Despite these observations, the physical mechanism governing dielectric screening across ZIF structures is not resolved. The authors note that comparisons with porous MOF analogues are needed to establish how internal voids and framework flexibility influence screening, with implications for understanding interfacial electric fields and triboelectric performance.