19675-63-9Relevant articles and documents
Control of interpenetration and gas-sorption properties of metal-organic frameworks by a simple change in ligand design
Prasad, Thazhe Kootteri,Suh, Myunghyun Paik
, p. 8673 - 8680 (2012)
In metal-organic framework (MOF) chemistry, interpenetration greatly affects the gas-sorption properties. However, there is a lack of a systematic study on how to control the interpenetration and whether the interpenetration enhances gas uptake capacities or not. Herein, we report an example of interpenetration that is simply controlled by the presence of a carbon-carbon double or single bond in identical organic building blocks, and provide a comparison of gas-sorption properties for these similar frameworks, which differ only in their degree of interpenetration. Noninterpenetrated (SNU-70) and doubly interpenetrated (SNU-71) cubic nets were prepared by a solvothermal reaction of [Zn(NO3)2]·6 H2O in N,N-diethylformamide (DEF) with 4-(2-carboxyvinyl)benzoic acid and 4-(2-carboxyethyl)benzoic acid, respectively. They have almost-identical structures, but the noninterpenetrated framework has a much bigger pore size (ca. 9.0×9.0 A) than the interpenetrated framework (ca. 2.5×2.5 A). Activation of the MOFs by using supercritical CO 2 gave SNU-70' and SNU-71'. The simulation of the PXRD pattern of SNU-71' indicates the rearrangement of the interpenetrated networks on guest removal, which increases pore size. SNU-70' has a Brunauer-Emmett-Teller (BET) surface area of 5290 m2 g-1, which is the highest value reported to date for a MOF with a cubic-net structure, whereas SNU-71' has a BET surface area of 1770 m2 g-1. In general, noninterpenetrated SNU-70' exhibits much higher gas-adsorption capacities than interpenetrated SNU-71' at high pressures, regardless of the temperature. However, at P2 at 77 K and CO2 at 195 K are higher for noninterpenetrated SNU-70' than for interpenetrated SNU-71', but the capacities for H2 and CH4 are the opposite; SNU-71' has higher uptake capacities than SNU-70' due to the higher isosteric heat of gas adsorption that results from the smaller pores. In particular, SNU-70' has exceptionally high H2 and CO2 uptake capacities. By using a post-synthetic method, the C=C double bond in SNU-70 was quantitatively brominated at room temperature, and the MOF still showed very high porosity (BET surface area of 2285 m2 g -1). Copyright
Triptycene carbene allyl palladium compound and application thereof
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Paragraph 0054-0061, (2021/06/02)
The invention relates to a triptycene carbene allyl palladium compound and application thereof. The structural formula of the triptycene carbene allyl palladium compound is a formula I or a fotmula II. Compared with a conventional metal palladium catalyst, the triptycene carbene allyl palladium compound is easy and convenient to prepare, high in yield and suitable for various substrates, the use amount of a catalyst can be reduced to one ten thousandth, and the compound has a good catalytic effect on various metal palladium catalytic reactions. The compound has important application value for researching the progress and application of catalytic reaction.
Triptycene carbene tridentate metal coordination compound and application thereof
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Paragraph 0059-0067, (2021/06/22)
The invention relates to a triptycene carbene tridentate metal coordination compound, wherein the structural formula of the triptycene carbene tridentate metal coordination compound is shown in the specification. According to the invention, the compound is correct in detection; based on the problems that a metal catalyst used in an organic reaction at the present stage cannot be suitable for various substrates, the catalyst content is high, the cost is high, long-time storage is difficult, and the like, the triptycene carbene tridentate metal coordination compound provided by the invention is used as a catalyst, the preparation is simple and convenient, the yield is high, the triptycene carbene tridentate metal coordination compound is suitable for various substrates, the usage amount of the catalyst can be reduced to one ten thousandth, and the triptycene carbene tridentate metal coordination compound has a better catalytic effect on various metal catalytic reactions, and has important application value for researching the progress and application of catalytic reaction.
