A hydrated amorphous iron oxide nanoparticle as active water oxidation catalyst

Developing efficient water oxidation catalysts (WOCs) with earth-abundant elements still remains a challenging task for artificial photosynthesis. Iron-based WOC is a promising candidate because it is economically cheap, little toxic and environmentally friendly. In this study, we found that the catalytic water oxidation activity on amorphous iron-based oxide/hydroxide (FeO_x) can be decreased by an order of magnitude after the dehydration process at room temperature. Thermogravimetric analysis, XRD and Raman results indicated that the dehydration process of FeO_x at room temperature causes the almost completely loss of water molecule with no bulk structural changes. Based on this finding, we prepared hydrated ultrasmall (ca. 2.2 nm) FeO_x nanoparticles of amorphous feature, which turns out to be extremely active as WOC with turnover frequency (TOF) up to 9.3 s^?1 in the photocatalytic Ru(bpy)₃²⁺-Na₂S₂O₈ system. Our findings suggest that future design of active iron-based oxides as WOCs requires the consideration of their hydration status.     

Isolation and Characterization of Anti-Inflammatory Lignans from Oenanthe javanica

Chemistry of Natural Compounds - A new lignan, named 1-phenylpropenoate-4,8′-lignan A (1), and three known lignans (2–4) were isolated from Oenanthe javanica (Blume) DC. for the first...     

Hepatoprotective phenylethanoid glycosides from Cirsium setosum

Two new phenylethanoid glycosides, namely β-D-glucopyranoside, 1″-O-(7S)-7-(3-methoxyl-4-hydroxyphenyl)-7-methoxyethyl-3″-α-L-rhamnopyranosyl-4″-[(8E)-7-(3-methoxyl-4-hydroxyphenyl)-8-propenoate] (1) and β-D-glucopyranoside, 1″-O-(7S)-7-(3-methoxyl-4-hydroxyphenyl)-7-methoxyethyl-3″-α-L-rhamnopyranosyl-4″-[(8E)-7-(4-hydroxyphenyl)-8-propenoate] (2), together with six phenylethanoid glycosides were isolated from Cirsium setosum. Their structures were elucidated by their spectroscopic data and references. Compounds 2, 4, 5, 7 and 8 (10 μM) exhibited moderate hepatoprotective activities. Compounds (3–8) were obtained from this plant for the first time.     

Antiangiogenic phenylpropanoid glycosides from Gynura cusimbua

A new phenylpropanoid glycoside, named α-L-rhamnopyranosyl-(1?2)-β-D-[4″-(8E)-7-(3,4-dihydroxyphenyl)-8-propenoate, 1″-O-(7S)-7-(3,4-dihydroxyphenyl)-7-methoxy-ethyl]-glucopyranoside (1), together with nine known compounds (2–10) were isolated from the active fraction (n-Butanol fraction) of Gynura cusimbua for the first time. The known compounds (2–10) were identified as phenylpropanoid glycosides on the basis of extensive spectral data and references. The antiangiogenic activities of compounds (1–10) were evaluated by MTT assay on HUVECs and wild-type zebrafish in vivo model assay. As a result, compounds 1, 6, 7, 8 and 10 exhibited certain antiangiogenic activities.     

A New Anthraquinone-Aurone Adduct with Hepatoprotective Activity from the Fruits of Cucumis bisexualis

Chemistry of Natural Compounds - A previously undescribed anthraquinone-aurone adduct 1, named...     

A New C19-Diterpenoid Alkaloid from Salted Aconiti Lateralis Radix Praeparata

Chemistry of Natural Compounds - A new C19-diterpenoid alkaloid, named 17-acetylaconitine A (1), was isolated from salted Aconiti lateralis Radix Praeparata. The structure of compound 1 was...     

双曲型积分微分方程的一个反问题

该文研究了一类双曲型积分微分方程确定未知系数的反问题,利用Ｂａｎａｃｈ压缩映像原理证明了该问题的局部存在唯一性和稳定性。     

A New Geranylated Lignan from Oenanthe javanica and Anti-Inflammatory Activity

Chemistry of Natural Compounds - A new geranylated lignan, named 8′-geranylated lignan A (1), and a known lignan (2) were isolated from Oenanthe javanica (Blume) DC., to our knowledge, for...