Why Do Carbonate Anions Have Extremely High Stability in the Interlayer Space of Layered Double Hydroxides? Case Study of Layered Double Hydroxide Consisting of Mg and Al (Mg/Al = 2)

• Published in: Inorganic chemistry Vol. 58; no. 16; pp. 10928 - 10935
• Main Authors: Sasai, Ryo, Sato, Hiroaki, Sugata, Mako, Fujimura, Takuya, Ishihara, Shinsuke, Deguchi, Kenzo, Ohki, Shinobu, Tansho, Masataka, Shimizu, Tadashi, Oita, Naoto, Numoto, Mako, Fujii, Yasuhiro, Kawaguchi, Shogo, Matsuoka, Yoshiki, Hagura, Koki, Abe, Tomohiro, Moriyoshi, Chikako
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 19.08.2019
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.9b01365

Layered double hydroxides (LDHs) are promising compounds in a wide range of fields. However, exchange of CO3 2– anions with other anions is necessary, because the CO3 2– anions are strongly affixed in the LDH interlayer space. To elucidate the reason for the extremely high stability of CO3 2– anions intercalated in LDHs, we investigated in detail the chemical states of CO3 2– anions and hydrated water molecules in the LDH interlayer space by synchrotron radiation X-ray diffraction, solid-state NMR spectroscopy, and Raman spectroscopy. We found the rigidity of the network structure formed between the CO3 2– anions, hydrated water molecules, and the hydroxyl groups on the metal hydroxide layer surface to be a crucial factor underlying the stability of CO3 2– anions in the LDH interlayer space.