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- W2023496880 abstract "A new soft-chemical transformation of layered perovskite oxides is described wherein K 2 O is sequentially extracted from the Ruddlesden-Popper (R-P) phase, K 2 La 2 Ti 3 O 10 (I), yielding novel anion-deficient KLa 2 Ti 3 O 9.5 (II) and La 2 Ti 3 O 9 (III). The transformation occurs in topochemical reactions of the R-P phase I with PPh 4 Br and PBu 4 Br (Ph = phenyl; Bu = n-butyl). The mechanism involves the elimination of KBr accompanied by decomposition of PR 4 + (R = phenyl or n-butyl) that extracts oxygen from the titanate. Analysis of the organic products of decomposition reveals formation of Ph 3 PO, Ph 3 P, and Ph-Ph for R = phenyl, and Bu 3 PO, Bu 3 P along with butane, butene, and octane for R = butyl. The inorganic oxides II and III crystallize in tetragonal structures (II: P4/mmm, a = 3.8335(1) A, c = 14.334(1) A; III: I4/mmm, a = 3.8565(2) A, c = 24.645(2) A) that are related to the parent R-P phase. II is isotypic with the Dion-Jacobson phase, RbSr 2 Nb 3 O 10 , while III is a unique layered oxide consisting of charge-neutral La 2 Ti 3 O 9 anion-deficient perovskite sheets stacked one over the other without interlayer cations. Interestingly, both II and III convert back to the parent R-P phase in a reaction with KNO 3 . While transformations of the R-P phases to other related layered/three-dimensional perovskite oxides in ion-exchange/metathesis/dehydration/reduction reactions are known, the simultaneous and reversible extraction of both cations and anions in the conversions K 2 La 2 Ti 3 O 10 ⇔KLa 2 Ti 3 O 9.5 ⇔ La 2 Ti 3 O 9 is reported here for the first time." @default.
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- W2023496880 date "2006-01-01" @default.
- W2023496880 modified "2023-09-27" @default.
- W2023496880 title "Reversible cation/anion extraction from K 2 La 2 Ti 3 O 10 : formation of new layered titanates, KLa 2 Ti 3 O 9.5 and La 2 Ti 3 O 9" @default.
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