Zn(ii)-based metal-organic framework: an exceptionally thermally stable, guest-free low dielectric material
Journal
Journal of Materials Chemistry C
Journal Volume
5
Journal Issue
6
Pages
1508-1513
Date Issued
2017
Author(s)
Mendiratta, S.
Usman, M.
Chang, C.-C.
Lee, Y.-C.
Wu, M.-K.
Hsu, C.-P.
Lu, K.-L.
Abstract
The synthesis of an exceptionally thermally stable, chemically stable, guest-free low-κ dielectric metal-organic coordination framework [Zn2(Hbbim)2(bbim)]n (1, H2bbim = bisbenzimidazole) was achieved under hydrothermal conditions. Structural analysis showed that compound 1 crystallizes in a triclinic space group P1 and possesses a guest-free structure. Compound 1 was found to be a low-κ dielectric material (3.05 at 1 MHz) that was extremely robust towards various solvents. The compound was exceptionally thermally stable and retained its structure at temperatures of up to 450 °C. Temperature-dependent dielectric studies revealed that 1 has a low-dielectric constant that remains stable upon increasing the temperature. This low-dielectric constant was further supported by density functional theory calculations, which showed that the dielectric property can be mainly attributed to electronic polarizability.
Type
journal article