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Aromatic guest-induced layer expansion and phase switching in a 2D square lattice coordination network
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DOI：10.1039/d6dt00929h.png)
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Abstract
En 中文
Switching coordination networks (CNs) that exhibit guest-induced phase transformations hold promise for molecular recognition and separation, yet their responsiveness to different adsorbates remains underexplored. Herein, we further investigate the previously reported guest-induced layer expansion and phase switching behavior of a 2D square lattice (sql) topology CN, [Co(4,4 '-bipyridine)(2)(NCS)(2)](n) (sql-1-Co-NCS), in the presence of a new group of aromatic guests, methylbenzene (MB), nitrobenzene (NB), and 1,3,5-trimethylbenzene (TMB). Overall, aromatic guest-induced open phases can be classified into three categories based on the number of guest molecules accommodated per formula unit, H & centerdot;xG (x = 2, 3, 4), with interlayer distances spanning 5.92-9.61 & Aring;. The TMB-loaded phase is unusual as it exhibits an alternating layered arrangement with two distinct interlayer distances of 8.29 and 8.80 & Aring;. Vapor adsorption studies of sql-1-Co-NCS revealed that MB vapor triggers phase switching at a lower relative pressure than C-8 aromatics, indicating a stronger host framework response and highlighting the potential of this material for the separation of substituted benzene derivatives.
Keywords:
METAL-ORGANIC FRAMEWORKS
CRYSTAL-STRUCTURES
PLANAR NETWORKS
POLYMERS
COVALENT
INTERPENETRATION
SORPTION
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3.3
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