Ag nanoclusters have received increasing attention due to their atomically precise and diverse structures and intriguing optical properties.N evertheless,t he inherent instability of Ag nanoclusters has seriously hindered their practical application. In this work, for the first time,A gc lusters are collaboratively protected by hydrophobic Ti-oxo clusters and alkyne ligands.I nitially,apyramidal Ag 5 cluster terminated with t BuCC À and CH 3 CN was inserted into the cavity of aTi 8oxonanoring to form Ag 5 @Ti 8 .T oovercome the instability of acetonitrile-terminated silver site,s uch two Ag 5 @Ti 8 clusters could sandwicha nA g 4 unit to form Ag 14 -nanorod@Ti 16 -oxonanoring (Ag 14 @Ti 16 ), whichi sp eripherally protected by fluorophenyl groups and alkyne caps.This threefold protected (hydrophobic fluorinated organic layer,T i-O shell, and terminal alkyne ligands) Ag 14 @Ti 16 exhibits superhydrophobicity and excellent ambient stability,e ndowing it with solidstate optical limiting characteristics.
Highly stable metal-organic frameworks (MOFs) with accessible sites have gradually been valued because of their excellent performance. Here, we proposed a steric hindrance effect to construct a partially charged MOF...
Ag nanoclusters have received increasing attention due to their atomically precise and diverse structures and intriguing optical properties.N evertheless,t he inherent instability of Ag nanoclusters has seriously hindered their practical application. In this work, for the first time,A gc lusters are collaboratively protected by hydrophobic Ti-oxo clusters and alkyne ligands.I nitially,apyramidal Ag 5 cluster terminated with t BuCC À and CH 3 CN was inserted into the cavity of aTi 8oxonanoring to form Ag 5 @Ti 8 .T oovercome the instability of acetonitrile-terminated silver site,s uch two Ag 5 @Ti 8 clusters could sandwicha nA g 4 unit to form Ag 14 -nanorod@Ti 16 -oxonanoring (Ag 14 @Ti 16 ), whichi sp eripherally protected by fluorophenyl groups and alkyne caps.This threefold protected (hydrophobic fluorinated organic layer,T i-O shell, and terminal alkyne ligands) Ag 14 @Ti 16 exhibits superhydrophobicity and excellent ambient stability,e ndowing it with solidstate optical limiting characteristics.
The charged metal−organic framework (MOF) (anionic and cationic MOF) material plays an important role in gas adsorption and separation and ecological environment management. Herein, we reported a partially charged Mg-based MOF (FJU-129) with dimethylamine counterions, which can efficiently separate C 2 H 2 from CO 2 and rapidly adsorb the cationic dye methylene blue (MB). FJU-129a showed a high uptake capacity of up to 133.8 cm 3 /g for C 2 H 2 at 273 K, 1 bar, and low isosteric heat of adsorption of C 2 H 2 (24.78 kJ/mol). The C 2 H 2 / CO 2 separation is validated by a dynamic breakthrough experiment at 296 K, 1.5 bar, and the Grand Canonical Monte Carlo simulation revealed that the partially remaining charge on the magnesium sites has an electrostatic force on the −C�C− bond of C 2 H 2 molecules, and C−H•••π interactions play an important role in the separation of C 2 H 2 /CO 2 selective mixtures. In addition, owing to the pore size and electrostatic effect, FJU-129 selectively absorbs MB and excludes other cationic dyes and anionic dyes (MB, CV, RB, R6G, MO, and SD-III).
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