Rajamathi Michael
Materials Research Group, St. Joseph's Research Institute, St. Joseph's University, 36 Lalbagh Road, Bangalore 560027, India.
ACS Omega. 2023 Mar 6;8(11):10185-10190. doi: 10.1021/acsomega.2c07515. eCollection 2023 Mar 21.
Anion exchange reactions with several monovalent anions and a divalent sulfate anion could be successfully carried out on 3R polytype of magnesium aluminum LDH containing interlayer carbonate ions by refluxing the carbonate-LDH in 1-butanol with ammonium salt of the desired anion. The reaction was similar to what was observed in the case of 3R polytype (Bhojaraj et al., , , 20072-20079) in that here too the reaction occurs topotactically resulting in 3R polytypes of LDHs in the cases of chloride and bromide anions. However, the reaction is much slower here demanding longer reaction times and/or higher amounts of ammonium salt of the anion. These exchange reactions pave the way for the synthesis of well-defined, hitherto unknown, 3R polytypes of magnesium aluminum LDH with chloride and bromide as interlayer anions.
通过将含层间碳酸根离子的3R型镁铝层状双氢氧化物（LDH）与所需阴离子的铵盐在1-丁醇中回流，可以成功地与几种单价阴离子和二价硫酸根阴离子进行阴离子交换反应。该反应与在3R型情况下观察到的反应类似（Bhojaraj等人，20072 - 20079），即在这里，对于氯离子和溴离子的情况，反应也是以拓扑方式发生，生成3R型的LDH。然而，这里的反应要慢得多，需要更长的反应时间和/或更高量的阴离子铵盐。这些交换反应为合成具有氯离子和溴离子作为层间阴离子的明确的、迄今未知的3R型镁铝LDH铺平了道路。
