861150-98-3Relevant academic research and scientific papers
Intrinsic Semiconducting Behavior in a Large Mixed-Valent Uranium(V/VI) Cluster
Zhang, Mingxing,Liang, Chengyu,Cheng, Guo-Dong,Chen, Junchang,Wang, Yumin,He, Linwei,Cheng, Liwei,Gong, Shicheng,Zhang, Duo,Li, Jiong,Hu, Shu-Xian,Diwu, Juan,Wu, Guozhong,Wang, Yaxing,Chai, Zhifang,Wang, Shuao
, p. 9886 - 9890 (2021)
We disclose the intrinsic semiconducting properties of one of the largest mixed-valent uranium clusters, [H3O+][UV(UVIO2)8(μ3-O)6(PhCOO)2(Py(CH2O)2)4(DMF)4] (Ph=phenyl, Py=pyridyl, DMF=N,N-dimethylformamide) (1). Single-crystal X-ray crystallography demonstrates that UV center is stabilized within a tetraoxo core surrounded by eight uranyl(VI) pentagonal bipyramidal centers. The oxidation states of uranium are substantiated by spectroscopic data and magnetic susceptibility measurement. Electronic spectroscopy and theory corroborate that UV species serve as electron donors and thus facilitate 1 being a n-type semiconductor. With the largest effective atomic number among all reported radiation-detection semiconductor materials, charge transport properties and photoconductivity were investigated under X-ray excitation for 1: a large on-off ratio of 500 and considerable charge mobility lifetime product of 2.3×10?4 cm2 V?1, as well as a high detection sensitivity of 23.4 μC Gyair?1 cm?2.
Macrocycles, adducts and monomeric boron compounds derived from 2,6-dimethanolpyridine and arylboronic acids
Vargas, Gabriela,Farfán, Norberto,Santillan, Rosa,Gutiérrez, Atilano,Gómez, Elizabeth,Barba, Victor
, p. 2996 - 3002 (2008/10/09)
The reaction of 2,6-dimethanolpyridine with arylboronic acids at room temperature led to the formation of tetrameric compounds 1a-1e in good yields. Since the tetrameric derivatives were insoluble in common organic solvents, their characterization was based on IR, mass spectrometry, as well as 13C and 11B NMR, in the solid state. Macrocyclic compounds 1a-1e can be hydrolyzed upon heating in DMSO to give adducts 2a-2e, which are only held by a coordination bond between the nitrogen and boron atoms, as demonstrated by 1H, 13C and 11B NMR, in solution. Moreover, the presence of an additional carbon atom in the aliphatic chain of the ligand, as in the case of 2,6(β-diethanolamine)pyridine, leads exclusively to the formation of the monomeric specie 4, as established by X-ray diffraction analysis.
