scholarly journals Valence self-regulation of sulfur in nanoclusters

2019 ◽  
Vol 5 (11) ◽  
pp. eaax7863 ◽  
Author(s):  
Xi Kang ◽  
Fengqing Xu ◽  
Xiao Wei ◽  
Shuxin Wang ◽  
Manzhou Zhu
Keyword(s):  
Mass Spectrometry ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Valence State ◽  
Self Regulation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Capping Ligands ◽  
First Time

The valence self-regulation of sulfur from the “−2” valence state in thiols to the “−1” valence state in hydroxylated thiolates has been accomplished using the Pt1Ag28 nanocluster as a platform—the first time that the “−1” valent sulfur has been detected as S−1. Two previously unknown nanoclusters, Pt1Ag28(SR)20 and Pt1Ag28(SR)18(HO-SR)2 (where SR represents 2-adamantanethiol), have been synthesized and characterized—in the latter nanocluster, the presence of hydroxyl induces the valence regulation of two special S atoms from “−2” (in SR) to “−1” valence state in the HO-S(Ag)R. Because of the contrasting nature of the capping ligands in these two nanoclusters [i.e., only SR in Pt1Ag28(SR)20 or both SR- and HO-SR- in Pt1Ag28(SR)18(HO-SR)2], they exhibit differing shell architectures, even though their cores (Pt1Ag12) are in the same icosahedral configuration. Single-crystal x-ray diffraction analysis revealed their 1:1 cocrystallization, and mass spectrometry verified the presence of hydroxyls on Pt1Ag28(SR)18(HO-SR)2.

scholarly journals 5α,8α-Epidioxysterols from a Formosan Sponge, Axinyssa sp

2013 ◽  
Vol 8 (11) ◽  
pp. 1934578X1300801
Author(s):  
Tzu-Rong Su ◽  
Kai-Ju Liang ◽  
Michael Y. Chiang ◽  
Mei-Chin Lu ◽  
Yu-Jen Wu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Cell Lines ◽  
Cancer Cell ◽  
Absolute Configuration ◽  
Cancer Cell Lines ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time

One new 5α,8α-epidioxysterol, 3-acetylaxinysterol (1), along with one known sterol, axinysterol (2), were isolated from a Formosan sponge, Axinyssa sp.. The structures of the compounds were determined by spectroscopic methods and the absolute configuration of 2 was further confirmed by single-crystal X-ray diffraction analysis for the first time. Compound 2 exhibited significant cytotoxicity against K562 and Molt 4 cancer cell lines.

scholarly journals Isolation and Identification of Cyclooctasulfur From the Octocoral Sinularia humilis (van Ofwegen, 2008)

2021 ◽  
Vol 16 (9) ◽  
pp. 1934578X2110406
Author(s):  
Jhao-Syuan Zeng ◽  
Yi-Hung Liu ◽  
San-Nan Yang ◽  
Su-Ying Chien ◽  
Zhi-Hong Wen ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Marine Invertebrate ◽  
X Ray Diffraction ◽  
Isolation And Identification ◽  
Chemical Examination ◽  
X Ray ◽  
First Time

Chemical examination of the octocoral Sinularia humilis, collected in the waters of Taiwan, led to the isolation of S8 (1). Its structure was determined by a single-crystal x-ray diffraction analysis and this is the first time that S8 has been reported from a marine invertebrate.

Synthesis of 4-(3-coumarinyl)-3-benzyl-4-thiazolin-2-one 4-methylbenzylidenehydrazone and determination of the isomeric structure by X-ray analysis

2003 ◽  
Vol 218 (12) ◽  
Author(s):  
Süheyla Özbey ◽  
Nilgün Karalı ◽  
Aysel Gürsoy
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Spectral Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Isomeric Structure ◽  
Elemental Analyses

AbstractIn this study 4-(3-coumarinyl)-3-benzyl-4-thi azolin-2-one 4-methylbenzylidenehydrazone 3 was synthesised. An independent proof of the thiazolylhydrazone structure of 3 was achieved by single crystal X-ray diffraction analysis. Elemental analyses and spectral data (IR,

Single-crystal X-ray diffraction analysis of nonplanar autoepitaxial silicon layers

2009 ◽  
Vol 45 (14) ◽  
pp. 1610-1613
Author(s):  
V. T. Bublik ◽  
L. V. Kozhitov ◽  
T. T. Kondratenko
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
X Ray

Functionalized triphenylphosphine oxide-based manganese(II) complexes for luminescent printing

2021 ◽  
Author(s):  
Xiaomeng Huang ◽  
Yanyan Qin ◽  
Pengfei She ◽  
Haixing Meng ◽  
Shu-Juan Liu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Triphenylphosphine Oxide ◽  
X Ray Diffraction ◽  
X Ray

Three novel neutral manganese(II) complexes (TPhPONMe2)2MnBr2, (TPhPOOMe)2MnBr2, and (TPhPOCF3)2MnBr2 have been designed and synthesized based on functionalized Ph3PO ligand. These structures are clarified by single crystal X-ray diffraction analysis, which...

scholarly journals Bridgehead vicinal diallylation of norbornene derivatives and extension to propellane derivatives via ring-closing metathesis

2016 ◽  
Vol 12 ◽  
pp. 1877-1883 ◽  
Author(s):  
Sambasivarao Kotha ◽  
Rama Gunta
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Ring Closing Metathesis ◽  
X Ray ◽  
Synthetic Strategy ◽  
Norbornene Derivatives

Here, we report a simple synthetic strategy to the bridgehead vicinal diallylation of norbornene derivatives. These substrates are useful to generate propellanes via ring-closing metathesis. Single-crystal X-ray diffraction analysis of four compounds led to the realization of configurational correction of earlier reported molecules.

scholarly journals A Covalent Organic Cage Compound Acting as a Supramolecular Shadow Mask for the Regioselective Functionalization of C60

2020 ◽  
Author(s):  
Viktoria Leonhardt ◽  
Stefanie Fimmel ◽  
Ana-Maria Krause ◽  
Florian Beuerle
Keyword(s):  
Mass Spectrometry ◽  
Single Crystal ◽  
High Selectivity ◽  
Shadow Mask ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Cage Compound ◽  
Vis Spectroscopy ◽  
Regioselective Functionalization

<div><div><div><p>A trigonal-bipyramidal covalent organic cage compound serves as an efficient host to form stable 1:1-complexes with C60 and C70. Fullerene encapsulation has been comprehensively studied by NMR and UV/Vis spectroscopy, mass spectrometry as well as single-crystal X-ray diffraction. Exohedral functionalization of encapsulated C60 via threefold Prato reaction revealed high selectivity for the symmetry-matched all-trans-3 addition pattern.</p></div></div></div>

scholarly journals Eightfold Electrophilic Methylation of Octacyanotungstate [W(CN)8]4−/3−: Preparation of Homoleptic, Eight-coordinate Methylisocyanide Complexes [W(CNMe)8]4+/5+

2021 ◽  
Author(s):  
Malte Sellin ◽  
Susanne Margot Rupf ◽  
Ulrich Abram ◽  
Moritz Malischewski
Keyword(s):  
Sulfur Dioxide ◽  
Single Crystal ◽  
Epr Spectroscopy ◽  
X Ray Diffraction ◽  
Liquid Sulfur ◽  
Methyl Fluoride ◽  
X Ray ◽  
First Time ◽  
Ir And Raman ◽  
Methyl Triflate

Homoleptic eight-fold coordinated methylisocyanide complexes of W(IV) and W(V) have been prepared for the first time. The reaction of [NBu4]4[W(CN)8] with methyl triflate MeOTf gives [W(CNMe)8][OTf]4. The even stronger methylating mixture of methyl fluoride MeF and arsenic pentafluoride AsF5 in liquid sulfur dioxide SO2 is able to fully alkylate both [NBu4]4[W(CN)8] and [NBu4]3[W(CN)8]. The paramagnetic octakis(methylisocyanide)- tungsten(V) [W(CNMe)8][AsF6]5 is thermally highly unstable above −30 °C. All compounds have been characterized via single-crystal X-ray diffraction, IR and Raman, as well as NMR or EPR spectroscopy<br>

Sign in / Sign up

Export Citation Format

Share Document