Hybrid halobismuthates as prospective light-harvesting materials: Synthesis, crystal, optical properties and electronic structure
作者:George C. Anyfantis、Anna Ioannou、Hamdi Barkaoui、Younes Abid、Vassilis Psycharis、Catherine P. Raptopoulou、George A. Mousdis
DOI:10.1016/j.poly.2019.114180
日期:2020.1
A = I) its structure consists of edge sharing BiI6 octahedral forming zigzag chains and in the case of (x = 2 and A = Br, Cl) their structure consists of corner sharing BiX6 octahedral also forming zigzag chains. The amine group is located in the free cavities between the chains. Their structural, optical and vibronic properties were studied. Band structure calculations were made in order to compare the
The First Bismuth Borosulfates Comprising Oxonium and a Tectosilicate‐Analogous Anion
作者:Matthias Hämmer、Lkhamsuren Bayarjargal、Henning A. Höppe
DOI:10.1002/anie.202011786
日期:2021.1.18
harmonic generation (SHG) measurement. The B(SO4)4 supertetrahedra are connected via all four sulfate tetrahedra resulting in a three‐dimensional anion with both H3O+ and Bi3+ cations in channels. Additionally, the crystalstructure of a further bismuth borosulfate, Bi2[B2(SO4)6], is elucidated crystallising isotypically to the rare‐earth borosulfates R2[B2(SO4)6] in space group C2/c (No. 15) (a=13.568(2)
第一个硼硫酸铋 (H 3 O)Bi[B(SO 4 ) 2 ] 4是第二个具有三维阴离子的化合物,是第一个在没有前体的情况下通过溶剂热合成的类网硅酸盐硼硫酸盐(来自 Bi(NO 3 ) 3 ⋅ 5 H 2 O和B(OH) 3在发烟硫酸中);此外,它是第一个包含两种不同电荷的阳离子并在空间群 I 中以新结构类型结晶的物质 (编号 82)(a=11.857(1),c=8.149(1) Å,1947 年参考值,111 参数,wR2=0.037),由二次谐波发生 (SHG) 测量证实。 B(SO 4 ) 4超四面体通过所有四个硫酸盐四面体连接,形成三维阴离子,通道中同时具有 H 3 O +和 Bi 3+阳离子。此外,还阐明了另一种硼硫酸铋 Bi 2 [B 2 (SO 4 ) 6 ] 的晶体结构,其与空间群 C2/c 中的稀土硼硫酸盐 R 2 [B 2 (SO 4 ) 6 ] 同型结晶。 (第 15 号)(a=13
Visible light driven efficient photocatalytic degradation of Congo red dye catalyzed by hierarchical CuS–Bi<sub>2</sub>Cu<sub>x</sub>W<sub>1−x</sub>O<sub>6−2x</sub> nanocomposite system
作者:Yagna Prakash Bhoi、Swaraj Rashmi Pradhan、Chinmaya Behera、B. G. Mishra
DOI:10.1039/c6ra02612e
日期:——
hierarchical nanostructures. The CuSBT materials possess characteristic features of a type-II heterojunction exhibiting narrow band gap, enhanced visiblelight absorption and efficient charge separation properties. The CuSBT materials were evaluated as visiblelight active photocatalyst for complete degradation of Congo red dye using H2O2 as oxidant. The CuSBT materials exhibited higher apparent rate constant
制备了一系列的CuS–Bi 2 Cu x W 1− x O 6−2 x纳米复合材料,并将其作为光催化剂对来自水源的刚果红染料的降解进行了评估。通过无定形柠檬酸盐法合成了Bi 2 WO 6(BT)纳米粒子。使用水热法将CuS纳米材料分散在BT基质上。利用XRD,FESEM,TEM,XPS,UV-Vis-DRS,PL,吸光法和FTIR技术对复合材料(CuSBT)进行了表征。X射线衍射研究表明存在六角形的Covellite CuS和正交的Russellite BT相。在水热处理期间,Cu 2+离子取代了W 6+离子在BT晶格中形成取代固溶体(Bi 2 Cu x W 1− x O 6-2 x)。复合材料包含CuS纳米棒和BT纳米片。在水热处理期间,BT相的形态发生了明显的重组,导致形成了花朵状的分层纳米结构。CuSBT材料具有II型异质结的特征,表现出窄的带隙,增强的可见光吸收和有效的电荷分离特性。使用H
New phosphonium bromobismuthate as selective catalytic reagent in the heterocyclization reactions
compound was synthesized and characterized by 1H NMR, 13C NMR, 31P NMR, FT-IR, differential scanning calorimetry (DSC) and single-crystal X-raydiffraction analysis. The crystal packing structures of title compound were stabilized by various intermolecular interactions especially of the type CH···Br hydrogen bonds between phosphonium cations and [Bi2Br9]3− anion. The relative contribution of various close
合成了一种新的杂化溴代铋化合物,并通过1 H NMR、13 C NMR、31 P NMR、FT-IR、差示扫描量热法 (DSC) 和单晶 X 射线衍射分析对其进行了表征。标题化合物的晶体堆积结构通过各种分子间相互作用得到稳定,尤其是磷阳离子和 [Bi 2 Br 9 ] 3−之间的 C H···Br 型氢键负离子。通过 Hirshfeld 表面分析研究了标题化合物和从剑桥结构数据库 (CSD) 获得的三种类似结构的各种紧密接触和二维指纹图的相对贡献。此外,研究了标题化合物在杂环化反应中的催化活性,以合成重要且具有药理学意义的苯并咪唑和苯并恶唑衍生物。结果表明,含p的醛类产物的收率-取代基和o-取代基高于m-取代基。除了选择性、操作简单、废物最小化、易于操作、反应时间短、产品收率高和易于后处理外,该技术使用标题化合物作为催化剂,绿色、可回收、柔软、显着无毒,并且易于处理。