In 2019,Nature Communications included an article by Krause, Simon; Evans, Jack D.; Bon, Volodymyr; Senkovska, Irena; Iacomi, Paul; Kolbe, Felicitas; Ehrling, Sebastian; Troschke, Erik; Getzschmann, Juergen; Toebbens, Daniel M.; Franz, Alexandra; Wallacher, Dirk; Yot, Pascal G.; Maurin, Guillaume; Brunner, Eike; Llewellyn, Philip L.; Coudert, Francois-Xavier; Kaskel, Stefan. Reference of 3,6-Dibromo-9H-carbazole. The article was titled 《Towards general network architecture design criteria for negative gas adsorption transitions in ultraporous frameworks》. The information in the text is summarized as follows:
Switchable metal-organic frameworks (MOFs) have been proposed for various energy-related storage and separation applications, but the mechanistic understanding of adsorption-induced switching transitions is still at an early stage. Here we report critical design criteria for neg. gas adsorption (NGA), a counterintuitive feature of pressure amplifying materials, hitherto uniquely observed in a highly porous framework compound (DUT-49). These criteria are derived by analyzing the phys. effects of micromechanics, pore size, interpenetration, adsorption enthalpies, and the pore filling mechanism using advanced in situ X-ray and neutron diffraction, NMR spectroscopy, and calorimetric techniques parallelised to adsorption for a series of six isoreticular networks. Aided by computational modeling, we identify DUT-50 as a new pressure amplifying material featuring distinct NGA transitions upon methane and argon adsorption. In situ neutron diffraction anal. of the methane (CD4) adsorption sites at 111 K supported by grand canonical Monte Carlo simulations reveals a sudden population of the largest mesopore to be the critical filling step initiating structural contraction and NGA. In contrast, interpenetration leads to framework stiffening and specific pore volume reduction, both factors effectively suppressing NGA transitions. The experimental part of the paper was very detailed, including the reaction process of 3,6-Dibromo-9H-carbazole(cas: 6825-20-3Reference of 3,6-Dibromo-9H-carbazole)
3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a pharmaceutical intermediate, and also an important intermediate of synthesizing optoelectronic materials. It has been used as a reagent in the synthesis of P7C3-A20 which is a potent neuroprotective agent.Reference of 3,6-Dibromo-9H-carbazole
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary