Advances in high dielectric constant materials will help in the development of energy storage applications such as capacitors, photovoltaics, photonics and transistors. Recently, improvements in electrical properties and enhancements in dielectric constants in materials have been reported by introducing metal-organic frameworks (MOF) in the form of organometallic compounds or metal-oxygen bonds into the organic polymers. Here, a series of zinc (Zn, 3d10) and cadmium (Cd, 4d10) aliphatic coordination complex polyesters with varying numbers of methylene spacer(s), 1 to 8, were synthesized and characterized for their dielectric properties. The rational design of these materials was motivated by Density Functional Theory (DFT) computations of the ionic, electronic and total dielectric constant contribution, along with the structural prediction. A dielectric constant, ε, was measured for Zn- as well as Cd-systems ranging from ca. 3.6-4.6 and ca. 4.0-6.7, respectively, with low dissipation factor, tan δ, ca. 0.02-0.08 over a frequency range of 103-106Hz. Average optical band gap for these high moleculaer weight and thermally stable polymers were found as high as ca. 5.5 ± 0.12 eV. These measurements were found to have a strong correlation with the DFT calculations. Increasing the number of -CH2- unit(s) incorporated in the backbone structure decreases the dielectric constant due to a decrease in metal atom concentration per unit area within the coordination environment.

Zinc and cadmium coordination polymers of aliphatic systems as dielectric materials

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.