Synthesis of Organic-Inorganic Hybrids Based on Perovskite-like Bismuth Titanate H2K0.5Bi2.5Ti4O13·H2O and n-Alkylamines

Iana A Minich; Oleg I Silyukov; Veronika V Gak; Evgeny V Borisov; Irina A Zvereva

doi:10.1021/acsomega.0c00424

Synthesis of Organic-Inorganic Hybrids Based on Perovskite-like Bismuth Titanate H₂K_0.5Bi_2.5Ti₄O₁₃·H₂O and n-Alkylamines

ACS Omega. 2020 Mar 30;5(14):8158-8168. doi: 10.1021/acsomega.0c00424. eCollection 2020 Apr 14.

Authors

Iana A Minich¹, Oleg I Silyukov¹, Veronika V Gak¹, Evgeny V Borisov², Irina A Zvereva¹

Affiliations

¹ Institute of Chemistry, St. Petersburg State University, 198504 St. Petersburg, Russia.
² Center for Optical and Laser Materials Research, St. Petersburg State University, 198504 St. Petersburg, Russia.

Abstract

New organic-inorganic hybrids have been synthesized by the intercalation of n-alkylamines (methylamine, ethylamine, n-propylamine, n-butylamine, n-hexylamine, and n-octylamine) into the structure of the protonated and hydrated form of the perovskite-like layered titanate H₂K_0.5Bi_2.5Ti₄O₁₃·H₂O (HKBT₄·H₂O). The possibility of the synthesis of the hybrid materials was studied in a wide range of conditions. It was found that interlayer water plays a crucial role in the formation of intercalated hybrids. The obtained compounds were characterized with powder X-ray diffraction analysis; Raman, IR, and NMR spectroscopies; thermogravimetry (TG), TG coupled with mass spectrometry, and CHN analyses; and scanning electron microscopy. It was suggested that the intercalated n-alkylamines exist in the form of alkylammonium ions forming a paraffin-like bilayer with an average tilting angle of ∼77.5°. The obtained HKBT₄×RNH₂ compounds contain 0.4-0.7 n-alkylamine molecules per formula unit as well as the varied amount of intercalated water. By gentle heating, they can be obtained as dehydrated forms, which are thermally stable up to 250 °C.