cluster substituted silicotungstates (STs) [H2N(CH3)2]9H9[Ti6O6(SiW10O37)3]·11H2O (1) and [H2N(CH3)2]16H10[Ti10O11(SiW10O37)2(SiW9O35)2]·14H2O (2) have been made by hydrothermal reactions. The polyoxoanion of 1 is a ring-shaped trimer where a Ti6O6 (Ti6}) wheel cluster is encapsulated by three divacant [SiW10O37]10– (SiW10O37) fragments. However, 2 is built by two divacant SiW10O37 units and two rare
两种新型钛氧轮簇取代硅钨酸盐 (STs) [H 2 N(CH 3 ) 2 ] 9 H 9 [Ti 6 O 6 (SiW 10 O 37 ) 3 ]·11H 2 O ( 1 ) 和 [H 2 N (CH 3 ) 2 ] 16 H 10 [Ti 10 O 11 (SiW 10 O 37 ) 2 (SiW 9 O 35 ) 2 ]·14H 2 O (2 ) 由水热反应制成。1的多氧阴离子是一个环状三聚体,其中一个 Ti 6 O 6 (Ti 6 }) 轮簇被三个双空 [SiW 10 O 37 ] 10– (SiW 10 O 37 ) 碎片包裹。然而,2是由两个双空 SiW 10 O 37单元和两个罕见的三空[SiW 9 O 35 ] 12– (SiW 9 O 35 ) 碎片建造的,并进一步安装了前所未有的 Ti 10 O 11(Ti 10 }) 双轮组。据我们所知,2在 POM 化学中很少见。对催化氧化性能的研究表明,1对使用
The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO<sub>2</sub> nanosheets upon annealing of a freeze-cast precursor
作者:Snejana Bakardjieva、Jakub Mares、Radek Fajgar、Victor Y. Zenou、Michaela Maleckova、Efthalia Chatzisymeon、Hana Bibova、Jaromir Jirkovsky
DOI:10.1039/c9ra03940f
日期:——
migration of La cations and phase transition from anatase to rutile. The La3+ cation, acting as a structural promoter, supported 2D TiO2 growth with well controlled crystallite size, surface area and porosity. La3+ could be regarded as a potential electronic promoter that can reduce the band gap of 2D TiO2 nanosheets and can provide a signature of the electron transfer and carrier chargeseparation. Both
采用绿色冷冻浇铸法制备了 3 wt% La 改性二氧化钛,并测试了其光催化降解 4-氯苯酚 (4-CP) 和去除总有机碳 (TOC) 的能力。在退火条件下,冷冻铸造前体转化为具有明确二维 TiO 2纳米片形态的 La 改性锐钛矿。X 射线衍射图案的 Rietveld 细化证实了 La 阳离子的取代性质,它引起了局部结构变化并涉及 TiO 2中的细微离子置换晶格由于离子尺寸效应。尽管四方结构几乎相同,但用 La 代替 Ti 通过降低带隙能量和增加电荷载流子迁移率来改变光催化活性。在 650°C 退火的材料表现出最高的光催化性能并实现了有效的 TOC 去除。在 800°C 退火后,由于 La 阳离子的扩散迁移和从锐钛矿到金红石的相变,产生了纳米级富镧区域。La 3+阳离子作为结构促进剂,支持二维 TiO 2生长,具有良好控制的微晶尺寸、表面积和孔隙率。La 3+可以被认为是一种潜在的电子促进剂,可以降低二维
Improving the structural stability and electrochemical performance of Na<sub>2</sub>Li<sub>2</sub>Ti<sub>6</sub>O<sub>14</sub> nanoparticles <i>via</i> MgF<sub>2</sub> coating
作者:Wei-Wei Ma、Hai-Tao Yu、Chen-Feng Guo、Ying Xie、Ning Ren、Ting-Feng Yi
DOI:10.1039/c9ra02392e
日期:——
Combination of nanocrystallization and surface coating techniques was improved to be helpful for improving the electrochemical performance of NLTO.
纳米晶化和表面涂层技术的结合被改进,有助于提高NLTO的电化学性能。
Half-Sandwich Titanium(IV) Complexes with Kläui's Tripod Ligand
作者:Tony C. H. Lam、Eddie Y. Y. Chan、Wing-Leung Mak、Samuel M. F. Lo、Ian D. Williams、Wing-Tak Wong、Wa-Hung Leung
DOI:10.1021/ic020287w
日期:2003.3.1
Et(3)N yielded the mu-oxo dimer [(L(OEt))(2)Ti(2)(Cl(4)cat)(2)(mu-O)] (5). The average Ti-O(P), Ti-O(C), and Ti-O(Ti) distances in 5 are 2.027, 1.926, and 1.7977(9) A. Treatment of 1 with 1,1'-binaphthol (BINOLH(2)) in the presence of Et(3)N afforded [(L(OEt))(2)Ti(2)(mu-O)(2)(mu-BINOL)] x 2BINOLH(2) (6.2BINOLH(2)). Complex 1 is capable of catalyzingringopening of epoxides with Me(3)SiN(3) under solvent-free
A New Hepta-Nuclear Ti-Oxo-Cluster-Substituted Tungstoantimonate and Its Catalytic Oxidation of Thioethers
作者:Hai-Lou Li、Chen Lian、Da-Peng Yin、Zhi-Yu Jia、Guo-Yu Yang
DOI:10.1021/acs.cgd.8b01474
日期:2019.1.2
A neoteric hepta-nuclear Ti-oxo-cluster-substituted tetrameric tungstoantimonate [H2N(CH3)2]22Na18Ti7O6(SbW9O33)4}2·124H2O (1) has hydrothermally been synthesized and tested by single-crystal/powder X-ray diffraction, IR spectra, and thermal analysis. The glamorous feature of this tetrameric polyoxoanion is an uncommon hepta-nuclear Ti-oxo-cluster octahedron [Ti7O6]16+ enclosed in four [B-α-SbW9O33]9– building units. As a heterogeneous catalyst, the investigation on catalytic oxidation with H2O2 for multiple thioethers indicated that 1 possesses high conversion and remarkable selectivity. Additionally, 1 exhibits good stability and excellent recyclability.
通过水热法合成了一种新七核钛氧簇取代的四元钨锑酸盐[H2N(CH3)2]22Na18Ti7O6(SbW9O33)4}2-124H2O (1),并通过单晶/粉末 X 射线衍射、红外光谱和热分析进行了测试。这种四元多氧阴离子的迷人之处在于,在四个[B-α-SbW9O33]9-构筑单元中包含了一个不常见的七核钛氧簇八面体[Ti7O6]16+。作为一种异相催化剂,用 H2O2 对多种硫醚进行催化氧化的研究表明,1 具有高转化率和显著的选择性。此外,1 还具有良好的稳定性和出色的可回收性。