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Title: Roles of Alkali Metals and Ionic Networks in Directing the Formation of Anionic Metal–Organic Frameworks

Journal Article · · Crystal Growth and Design

Integrating different types of fundamental chemical interactions to direct the self-assembly processes and to control the dimension of the network formed by each type of interactions is a promising strategy to develop advanced functional materials. Here, the ionic interaction of alkali metals (Na, K, Cs) towards multi-functional 2,2’-disulfo-4,4’-oxydibenzoic acid is utilized in two solvent systems, aqueous-amide and uro-amide, to synthesize six novel anionic framework materials with dramatically different features and dimensionalities: (Na3[Zn4O(L4-)3(e-murea)(H2O)3](H2N(CH3)2+)3 (CPM-s1), [Zn4O(L4-)3(DMF)]((NH2(CH3)2+)6) (CPM-s2), Na6[(Zn2OH2)3(L3-)6](H2O)3 (CPM-s3), K3[Zn2(L4-)2](H2N(CH3)2+)(e-murea)2(H2O)3 (CPM-s4), K4[Zn(L3-)2](H2O)2 (CPM-s5), and Cs6[Zn(L4-)2](H2O)2 (CPM-s6), L4- = 2,2’-disulfo-4,4’-oxydibenzoate, DMF = N,N-dimethylformamide, e-murea = 1,3-dimethyl-1-2-imidazolidinone). In CPM-s1 to CPM-s6, the alkali-sulfonate ionic bonding networks transformed from 0D clusters with Na+ to 1D chains and 2D sheets with K+, and 3D network with Cs+. These vastly differing ionic domains influenced the coordination modes and spatial arrangements of the metal-carboxylate linkers, which consequently, directed the dimensionality of the coordination networks from 3D with Na+ to 1D with Cs+. CPM-s1 and CPM-s2, made from tetrameric Zn4O clusters are rare examples of anionic MOF-5-type structures. CPM-s3 features an unprecedented hexameric Zn6 cluster. Even though a large portion of the charge-balancing cations in these materials would hamper hydrogen bonding networks, some of them still exhibit very high ionic conductivity (e.g. 1.25 x 10-3 S cm-1 in CPM-s3), suggesting the potential of these materials as solid-state electrolytes.

Research Organization:
Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0010596
OSTI ID:
1755104
Journal Information:
Crystal Growth and Design, Vol. 20, Issue 10; ISSN 1528-7483
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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