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Consecutive single-crystal-to-single-crystal isomerization of novel octamolybdate anions within a microporous hybrid framework with robust water sorption properties
Date
2023
Abstract
The 3D hybrid framework [{Cu(cyclam)}3(k-Mo8O27)]ยท 14H2O (1) (cyclam=1,4,8,11-tetraazacyclotetradecane) undergoes sequential single-crystal-to-single-crystal transformations upon heating to afford two different anhydrous phases (2 a and 3a). These transitions modify the framework dimensionality and enable the isomerization of k-octamolybdate (k-Mo8) anions into ฮป (2 a) and ฮผ (3 a) forms through metal migration. Hydration of 3a involves condensation of one water molecule to the cluster to afford the ฮณ-Mo8 isomer in 4, which dehydrates back into 3a through the 6a intermediate. In contrast, 2a reversibly hydrates to form 5, exhibiting the same Mo8 cluster as that of 1. It is remarkable that three of the Mo8 clusters (k, ฮป and ฮผ) are new and that up to three different microporous phases can be isolated from 1 (2 a, 3a, and 6a). Water vapor sorption analyses show high recyclability and the highest uptake values for POM-based systems. The isotherms display an abrupt step at low humidity level desirable for humidity control devices or water harvesting in drylands.
Supervisor
Description
Publisher
Wiley and Sons Ltd
Citation
Angewandte Chemie International Edition, 2023, e202307436
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Funding Information
Eusko Jaurlaritza/Gobierno Vasco (EJ/GV, grants IT1722-22 and KK-2022/00045). E.R.B. thanks EJ/GV for her doctoral fellowship (PRE_2018_1_0143). Technical and human support from SGIker (UPV/EHU) is gratefully acknowledged.