Prediction and observation of ring and chain isomers in Sn− i ons

Ganteför, Gerd; Hunsicker, Stefan; Jones, R.

doi:10.1016/0009-2614(95)00206-j

Cited by 26 publications

(22 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4b), the most stable form of sulfide radicals in nature 41 , other kinds of polysulfide radicals such as S 4˙-40,42 or even longer-chain radicals may also be present concurrently in the transient states via the cleavage of the polysulfide rings or chains under the electrical field, considering the highly insulating nature of sulfur. However, the structural stability of other longer-chain radicals is poor and it is likely that they immediately transform to the more stable 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 14 forms, e.g., S 3˙-and S 2˙-, that have been identified by ex situ EPR experiments 43,44 . In fact, a recent work using in situ XAS measurements reported the existence of S 3˙-radicals generated during the electrochemical reactions, further confirming the critical effects of sulfur radicals in the system 45 .…”

Section: Resultsmentioning

confidence: 94%

Following the Transient Reactions in Lithium–Sulfur Batteries Using an In Situ Nuclear Magnetic Resonance Technique

et al. 2015

View full text Add to dashboard Cite

A fundamental understanding of electrochemical reaction pathways is critical to improving the performance of Li-S batteries, but few techniques can be used to directly identify and quantify the reaction species during disharge/charge cycling processes in real time. Here, an in situ (7)Li NMR technique employing a specially designed cylindrical microbattery was used to probe the transient electrochemical and chemical reactions occurring during the cycling of a Li-S system. In situ NMR provides real time, semiquantitative information related to the temporal evolution of lithium polysulfide allotropes during both discharge/charge processes. This technique uniquely reveals that the polysulfide redox reactions involve charged free radicals as intermediate species that are difficult to detect in ex situ NMR studies. Additionally, it also uncovers vital information about the (7)Li chemical environments during the electrochemical and parasitic reactions on the Li metal anode. These new molecular-level insights about transient species and the associated anode failure mechanism are crucial to delineating effective strategies to accelerate the development of Li-S battery technologies.

show abstract

Section: Resultsmentioning

confidence: 94%

Following the Transient Reactions in Lithium–Sulfur Batteries Using an In Situ Nuclear Magnetic Resonance Technique

et al. 2015

View full text Add to dashboard Cite

show abstract

“…15,46 In wet chemistry, the sulfur species in the red solution prepared from sulfur and Na 2 S 4 in DMF, HMP (hexamethylphosphoric triamide) or acetone was thought to be the red S 4 ¹ anion. However, no convincing proof for it has been obtained from spectroscopic studies.…”

Section: Smentioning

confidence: 99%

“…Zakrzewski 16b and Ganteför 15,46 groups have optimized the geometry of the S 4 ¹ anion using the HF/6-31+G* and a combination of density functional calculation with molecular dynamics (MD/DF), respectively: both the groups have suggested that a planar C 2v species is the most stable isomer. However, Morokuma et al have mentioned that the free S 4 ¹ anion has the C 2h isomer as the most favorable structure using QCISD(T)/MC-311G(2d).…”

Section: Smentioning

confidence: 99%

Chemistry of Tetrasulfur Including Mysterious Rectangular S4 Metal Complexes

Isobe¹

2011

Chemistry Letters

View full text Add to dashboard Cite

Of eleven possible isomers for neutral S 4 , rectangular S 4 has been proposed theoretically as one of the most stable forms. There has, however, been no consensus as to the S 4 ground-state geometric structure despite much effort over recent years, because of the lack of direct structural information from experimental work due to lack of preparation in a pure state. The principal question is whether the ground-state geometry is rectangular D 2h or open planar C 2v . Our group found first rectangular S 4 in coordination compounds of Rh and Ir tetranuclear complexes as a ligand and disclosed mysterious rectangular S 4 by X-ray analysis and theoretical studies. Here, the newly developed chemistry of rectangular S 4 complexes together with the related tetrasulfur species is introduced both from experimental and theoretical view points. In addition, more accurate argument of the principal question mentioned above is also described using results obtained from recent high-level theoretical calculations.

show abstract

“…as metal, sulfur, and carbon clusters [15][16][17][18][19][20]. The pulsed arc discharge may normally produce relatively small clusters (n ∼ 30).…”

Section: Introductionmentioning

confidence: 99%

Production of fullerenes by high-temperature pulsed arc discharge

Sugai

Omote

Shinohara

1999

The European Physical Journal D

View full text Add to dashboard Cite

We have developed a high-temperature pulsed arc discharge apparatus, which can operate in a buffer gas heated up to 1000 • C, and have succeeded in producing fullerenes for the first time with this method. We have quantitatively analyzed the products, using high-performance liquid chromatography (HPLC), to estimate the concentration of fullerenes in soot. The results show that fullerenes are produced not at room temperature but at much higher temperatures such as 1000 • C for Ar. The concentration of fullerenes C 70 and higher increases as the pulse width of the discharge increases. In the pulsed arc discharge, the negative electrode is consumed by the sputtering of buffer gas ions.

show abstract

Prediction and observation of ring and chain isomers in Sn− i ons

Cited by 26 publications

References 14 publications

Following the Transient Reactions in Lithium–Sulfur Batteries Using an In Situ Nuclear Magnetic Resonance Technique

Following the Transient Reactions in Lithium–Sulfur Batteries Using an In Situ Nuclear Magnetic Resonance Technique

Chemistry of Tetrasulfur Including Mysterious Rectangular S4 Metal Complexes

Production of fullerenes by high-temperature pulsed arc discharge

Contact Info

Product

Resources

About