Inorganic-organic derivatives of layered perovskite-like titanates HLnTiO4 (Ln = La, Nd) with n-amines and n-alcohols: Synthesis, thermal, vacuum and hydrolytic stability

Highly Efficient Liquid-Phase Exfoliation of Layered Perovskite-like Titanates HLnTiO4 and H2Ln2Ti3O10 (Ln = La, Nd) into Nanosheets

“…The conditions for the intercalation of n-alkylamines into the interlayer space of the protonated titanates were adopted from our previous reports [27,57]. Methylamine derivatives (R = Me) were synthesized directly from the protonated titanates.…”

“…This research involved the use of two types of precursors for exfoliation: protonated titanates and their amine derivatives produced via the intercalation of n-alkylamines with various chain lengths into the interlayer space. All the aforementioned precursors have been synthesized and comprehensively characterized in full accordance with the methods from our previous reports [27,57]. Here, we briefly highlight only the key points of their characterization.…”

“…The intercalation of n-alkylamines is accompanied by a characteristic low-angle shift of the (00x) reflections in the XRD patterns (Figure S1) and results in a corresponding increase in the values of the c parameter and interlayer distance d, being generally proportional to the n-alkylamine length. The alkyl chains form a paraffine-like bilayer with a tilt angle to the perovskite slab of 71-77 • [27,57]. Thus, the layered titanate structure experiences pronounced interlayer expansion, which should facilitate its further exfoliation into separate perovskite slabs.…”

“…The superior physical-chemical properties of these compounds originate from the unique perovskite structure of the slabs and the propensity of their interlayer space for various reactions, such of ion exchange and intercalation [16][17][18][19]. Layered perovskites are well established as efficient catalysts [20,21], photocatalysts [22][23][24][25][26][27][28][29], ionic conductors [30][31][32][33][34][35][36][37][38] and luminescent materials [39][40][41][42][43][44], as well as precursors for the creation of composite [45][46][47][48][49][50][51][52] and hybrid inorganic-organic materials [53][54][55][56][57][58][59][60].…”

Photocatalytic Hydrogen Production from Aqueous Solutions of Glucose and Xylose over Layered Perovskite-like Oxides HCa2Nb3O10, H2La2Ti3O10 and Their Inorganic-Organic Derivatives

“…This allows forming hybrid inorganic−organic derivatives, consisting of the layered inorganic matrix and organic modifiers, chemically anchored to the interlayer space via oxygen vertices of the perovskite octahedra [ 65 , 66 , 67 ]. Two key approaches to the synthesis of such hybrid materials are intercalation of organic bases [ 68 , 69 , 70 ] and esterification-like grafting of alcohols [ 71 , 72 , 73 ], carbohydrates [ 74 ], alkoxysilanes [ 75 ], and organophosphorus acids [ 76 ]. Despite the wide range of inorganic−organic derivatives synthesized, until recently, any data on their photocatalytic activity towards hydrogen production have been practically absent due to probable concerns about their stability under operating conditions [ 77 ].…”