Pore Environment Optimization of Microporous Metal-Organic Frameworks with Huddled Pyrazine Pillars for CH/CO Separation.

Metal-organic frameworks (MOFs) have been proven promising in addressing many critical issues related to gas separation and purification. However, it remains a great challenge to optimize the pore environment of MOFs for purification of specific gas mixtures. Herein, we report the rational construction of three isostructural microporous MOFs with the 4,4',4"-tricarboxyltriphenylamine (HTCA) ligand, unusual hexaprismane NiO cluster, and functionalized pyrazine pillars [PYZ-x, x = -H (DZU-10), -NH (DZU-11), and -OH (DZU-12)], where the building blocks of NiO clusters and huddled pyrazine pillars are reported in porous MOFs for the first time.

Interpenetrated metal-organic frameworks with enhanced photoluminescence for selective recognition of -xylene from xylene isomers.

Two novel luminescent metal-organic frameworks (MOFs), [Zn(TCA)(BPB)] (DZU-101, where HTCA = 4,4',4''-tricarboxyltriphenylamine and BPB = 1,4-bis(pyrid-4-yl)benzene) and [Zn(TCA)(BPB)DMA] (DZU-102), based on the same ligands and metal ions were synthesized by regulating the amount of water in the solvothermal reaction system. Structural analyses show that the two MOFs have pillar-layered frameworks with Zn clusters connected by the TCA and BPB ligands. Interestingly, DZU-102 possessed a two-fold interpenetrated framework distinct from the individual network of DZU-101.

Formation of organic chloramines during chlorination of 18 compounds.

Organic chloramines have attracted considerable attention because of their potential toxicity and reactivity. However, the lack of suitable and effective analytical methods has limited the study of organic chloramines due to their volatile and unstable properties. In this study, membrane introduction mass spectrometry (MIMS) combined with DPD/FAS titration was used to monitor the formation of organic chloramines.

Mechanism of hysteresis in shock wave reflection.

This paper reports on the mechanism of the hysteresis in the transition between regular and Mach shock wave reflections. We disclose that, for a given inflow Mach number, a stable reflection configuration should maintain the minimal dissipation. As the wedge angle varies, the set of the minimal dissipation points forms the valley lines in the dissipation landscape, and these valley lines compose the hysteresis loop.

Synthesis and in vitro antitumor activity evaluation of copper(II) complexes with 5-pyridin-2-yl-[1,3]dioxolo[4,5-g]isoquinoline derivatives.

Seven Cu(II) complexes with 5-pyridin-2-yl-[1,3]dioxolo[4,5-g]isoquinoline derivatives as ligands: [Cu(L)Cl] (1), [Cu(L)Cl] (2), [Cu(L)(NO)] (3), [Cu(L)(NO)] (4), [Cu(L)Cl] (5), [Cu(L)Br] (6) and [Cu(L)(NO)] (7){L=9-nitro-5-pyridin-2-yl-[1,3]dioxolo[4,5-g]isoquinoline, L=4-nitro-5-pyridin-2-yl-[1,3]dioxolo[4,5-g]isoquinoline, L=9-bromo-5-pyridin-2-yl-[1,3]dioxolo[4,5-g]isoquinoline}, were synthesized and characterized. Their in vitro anticancer activities against T-24, MGC-80-3, HeLa, Hep-G2, A549 and SK-OV-3 were evaluated. Compared with their corresponding ligands, most of these complexes exhibited enhanced anticancer activities in contrast to their corresponding ligands and copper salt.