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Functional Groups Assisted Tunable Dielectric Permittivity of Guest-Free Zn-Based Coordination Polymers for Gate Dielectrics |
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| Authors: | Saqib Kamal Arif I Inamdar Kuan-Ru Chiou Batjargal Sainbileg Muhammad Usman Jenq-Wei Chen Tzuoo-Tsair Luo Michitoshi Hayashi Chen-Hsiung Hung Wen-Feng Liaw Kuang-Lieh Lu |
| Institution: | 1. Institute of Chemistry Academia Sinica, Taipei, 115 Taiwan
Molecular Science and Technology, Taiwan International Graduate Program, Institute of Atomic and Molecular Science, Academia Sinica, Taipei 115 & Department of Chemistry, National Tsing Hua University, Hsinchu, 300 Taiwan Department of Chemistry, Fu Jen Catholic University, New Taipei City, 242 Taiwan;2. Institute of Chemistry Academia Sinica, Taipei, 115 Taiwan;3. Department of Physics, National Taiwan University, Taipei, 106 Taiwan;4. Center for Condensed Matter Sciences, National Taiwan University & Center of Atomic Initiative for New Materials, National Taiwan University, Taipei, 106 Taiwan;5. Molecular Science and Technology, Taiwan International Graduate Program, Institute of Atomic and Molecular Science, Academia Sinica, Taipei 115 & Department of Chemistry, National Tsing Hua University, Hsinchu, 300 Taiwan |
| Abstract: | The dielectric properties of coordination polymers has been a topic of recent interest, but the role of different functional groups on the dielectric properties of these polymers has not yet been fully addressed. Herein, the effects of electron-donating (R=NH2) and electron-withdrawing (R=NO2) groups on the dielectric behavior of such materials were investigated for two thermally stable and guest-free Zn-based coordination polymers, Zn(L1)(L2)]n ( 1 ) and Zn(L1)(L3)]n ( 2 ) L1=2-(2-pyridyl) benzimidazole (Pbim), L2=5-aminoisophthalate (Aip), and L3=5-nitroisophthalate (Nip)]. The results of dielectric studies of 1 revealed that it possesses a high dielectric constant (κ=65.5 at 1 kHz), while compound 2 displayed an even higher dielectric constant (κ=110.3 at 1 kHz). The electron donating and withdrawing effects of the NH2 and NO2 substituents induce changes in the polarity of the polymers, which is due to the inductive effect from the aryl ring for both NO2 and NH2. Theoretical results from density functional theory (DFT) calculations, which also support the experimental findings, show that both compounds have a distinct electronic behavior with diverse wide bandgaps. The significance of the current work is to provide information about the structure-dielectric property relationships. So, this study promises to pave the way for further research on the effects of different functional groups on coordination polymers on their dielectric properties. |
| Keywords: | coordination polymers dielectric high κ structure tuning |