ABSTRACT
A simple but efficient strategy to improve the ability of adsorptive denitrogenation (ADN) of MIL-101(M101) was studied by the in situ encapsulation of phosphomolybdic acid (PMA) and the subsequent purification of the as-synthesized product by the NH4F solution. After the NH4F treatment, the vast majority of PMA was removed, loss of organic ligand (BDC) was observed, and the fluorination of the hydroxyl group in the M101 structure occurred. The ADN activities of the Cr-MOF matrix composites before and after fluorination were studied in detail. The rest of PMA interacts strongly with M101 and assists the ADN activity. Coordination unsaturated metal sites (CUS) in M101 are formed after fluorination and also contribute to ADN activity. Further, fluoride anions replace most of the hydroxide groups in M101, which can promote the ADN of quinoline (QUI) and indole (IND) through an acid-base interaction and N-atom coordination with the CUS in M101. P-M101-F 5% exhibits the highest adsorptive capacity and excellent regeneration ability. Special emphasis in this work is placed on structure modulation (including PMA doping, CUS creation, and fluorination) of M101 for enhancing ADN activity, which provides a useful scaffold for future research in the rational design of MOF-based ADN catalysts.
ABSTRACT
<p><b>OBJECTIVE</b>To study the chemical constituents from Delphinium honanense var. piliteram.</p><p><b>METHOD</b>The constituents were isolated and purified with chromatographic methods, identified by NMR, MS and IR.</p><p><b>RESULT</b>Six compounds were isolated and elucidated as siwanine E (1), isoatisine (2), 12-epi-napelline (3), acontine (4), ajadelphinine (5) and beta-sitosterol (6).</p><p><b>CONCLUSION</b>Compounds 1-6 are all isolated from the plant for the first time.</p>
Subject(s)
Delphinium , Chemistry , Drugs, Chinese Herbal , Chemistry , Plants, Medicinal , ChemistryABSTRACT
To investigate the chemical constituents of the roots of Aconitum taipaicum, silica gel column chromatography was used for the isolation and purification of compounds. A new norditerpenoid alkaloid, isodelelatine (1), along with five known alkaloids, atisine (2), delfissinol (3), liangshanine (4), hypaconitine (5) and delelatine (6) were isolated and identified. The structure of the new compound was elucidated on the basis of spectral data.
Subject(s)
Aconitine , Chemistry , Aconitum , Chemistry , Alkaloids , Chemistry , Diterpenes , Chemistry , Molecular Structure , Plant Roots , Chemistry , Plants, Medicinal , ChemistryABSTRACT
<p><b>OBJECTIVE</b>To separate and identify the constituents from Clerodendron fragrans.</p><p><b>METHOD</b>The constituents were isolated and purified with chromatographic methods, identified by NMR, MS, IR.</p><p><b>RESULT</b>Beta-sitosterol (1), clerosterol (2), daucosterol (3), caffeic acid (4), kaempferol (5), 5,4'-dihydroxy-kaempferol-7-O-beta-rutinoside (6), acteoside (7) and leucoseceptoside A (8), were isolated and identified.</p><p><b>CONCLUSION</b>Compound 7 and 8 were identified for the first time from Clerodendron fragrans.</p>
Subject(s)
Clerodendrum , Chemistry , Glucosides , Chemistry , Glycosides , Chemistry , Phenols , Chemistry , Plant Leaves , Chemistry , Plants, Medicinal , Chemistry , Sitosterols , ChemistryABSTRACT
<p><b>OBJECTIVE</b>To study the constituents from Clerodendrum bungei.</p><p><b>METHOD</b>The constituents were isolated and purified with chromatographic methods, and identified by NMR, MS and IR.</p><p><b>RESULT</b>Five compounds were isolated, beta-sitosterol (1), taraxerol (2), glochidone (3), glochidonol (4), glochidiol (5).</p><p><b>CONCLUSION</b>Compounds (3), (4) and (5) were isolated for the first time from C. bungei.</p>
