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Title: Predicting the Solubility of Inorganic Ion Pairs in Water

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2];  [1];  [1];  [3];  [3];  [4]; ORCiD logo [1]
  1. Oregon State University, Corvallis, OR (United States)
  2. Barcelona Institute of Science & Technology (BIST), Tarragona (Spain)
  3. Umea University (Sweden)
  4. Barcelona Institute of Science & Technology (BIST), Tarragona (Spain); Universitat Rovira i Virgili (URV), Tarragona (Spain)

Abstract Polyoxometalates (POMs), ranging in size from 1 to 10’s of nanometers, resemble building blocks of inorganic materials. Elucidating their complex solubility behavior with alkali‐counterions can inform natural and synthetic aqueous processes. In the study of POMs ([Nb 24 O 72 H 9 ] 15− , Nb 24 ) we discovered an unusual solubility trend (termed anomalous solubility) of alkali‐POMs, in which Nb 24 is most soluble with the smallest (Li + ) and largest (Rb/Cs + ) alkalis, and least soluble with Na/K + . Via computation, we define a descriptor (σ‐profile) and use an artificial neural network (ANN) to predict all three described alkali‐anion solubility trends: amphoteric, normal (Li + >Na + >K + >Rb + >Cs + ), and anomalous (Cs + >Rb + >K + >Na + >Li + ). Testing predicted amphoteric solubility affirmed the accuracy of the descriptor, provided solution‐phase snapshots of alkali–POM interactions, yielded a new POM formulated [Ti 6 Nb 14 O 54 ] 14− , and provides guidelines to exploit alkali–POM interactions for new POMs discovery.

Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Spanish Ministry of Science and Innovation; Severo Ochoa Excellence Accreditation; Catalan Institute of Chemical Research (ICIQ); Murdock Charitable Trust; Swedish Research Council (SRC); Kempe Foundation; USDOE
Grant/Contract Number:
SC0010802; PID2020-112806RB-I00; CEX2019-000925-S, MCI/AEI; SR-2017297; 2018-07039; JCK-2029.1
OSTI ID:
1976280
Alternate ID(s):
OSTI ID: 1846505
Journal Information:
Angewandte Chemie (International Edition), Vol. 61, Issue 19; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)