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Two resistance-switchable hybrid polyoxotantalates based on {Co2Ta12} clusters.

Authors :: Cao, Yun-Fei
Lin, Yu-Jin
Li, Xin-Xiong
Sun, Yan-Qiong
Zheng, Shou-Tian
Source :: CrystEngComm; 7/14/2024, Vol. 26 Issue 26, p3527-3534, 8p
Publication Year :: 2024
Abstract: Two inorganic–organic hybrid polyoxotantalates, H<subscript>4</subscript>[Na(H<subscript>2</subscript>O)<subscript>5</subscript>]<subscript>2</subscript>[Co<superscript>II</superscript>(en)<subscript>3</subscript>]<subscript>2</subscript>{[Co<superscript>III</superscript>(en)]<subscript>2</subscript>(Ta<subscript>6</subscript>O<subscript>19</subscript>)<subscript>2</subscript>}·22H<subscript>2</subscript>O (1) and H<subscript>2</subscript>K<subscript>2</subscript>Na<subscript>6</subscript> (H<subscript>2</subscript>O)<subscript>24</subscript>{[Co<superscript>III</superscript>(en)]<subscript>2</subscript>(Ta<subscript>6</subscript>O<subscript>19</subscript>)<subscript>2</subscript>}·33H<subscript>2</subscript>O (2) have been constructed from {[Co<superscript>III</superscript>(en)(Ta<subscript>6</subscript>O<subscript>19</subscript>)]<subscript>2</subscript>}<superscript>10−</superscript> ({Co<subscript>2</subscript>Ta<subscript>12</subscript>}) dimers. Compound 1 has a three-dimensional supramolecular framework with a pcu-type topology. Compound 2 possesses a three-dimensional structure composed of {Co<subscript>2</subscript>Ta<subscript>12</subscript>} dimers and alkali metal ions (Na<superscript>+</superscript>/K<superscript>+</superscript>) via coordination bonds. Polyoxotantalates 1 and 2 have been used as active materials for ITO/1/Ag and ITO/2/Ag RRAM devices. These devices exhibit stable non-volatile storage behavior and rewritable resistive switching with high ON/OFF ratios of 1.43 × 10<superscript>3</superscript> and 2.17 × 10<superscript>4</superscript> for 1-based and 2-based RRAM devices, respectively, and stable cyclic performance during 100-cycle stability tests. This discovery opens up new opportunities for the development of electrical bistability materials. [ABSTRACT FROM AUTHOR]