Optical Absorption Spectra of the Homocyclic Sulfur Molecules S_n (n = 6, 7, 8, 9, 10, 12, 15, 20) in Solution [1]

Abstract

The optical absorption spectra of the sulfur homocycles Sn (n = 6–10,12, 15, 20) in methanol or methylcyclohexane solution have been recorded in the region 200–360 nm using a conventional spectrophotometer as well as a diode‐array spectrophotometer. Each compound shows a characteristic absorption curve. The extinction coefficients at 254 nm increase with increasing ring size, and the lowest‐energy absorption maximum shifts to the red with increasing number of atoms in the molecule. The data are used to re‐interprete the published absorption spectra of liquid and irradiated sulfur.

Layered Sulfur Nanosheets Prepared by Assembly of Sulfur Quantum Dots: Implications for Wide Optical Absorption and Multiwavelength Photoluminescence

“…Thus, the band at 205 nm might arise from n –σ* transition. From another point of view, the absorption behavior of S-NSs was also similar to the absorption behaviors of other allotropes of elemental sulfur; for example, the absorption band of S 6 had a maximum absorption peak at 234 nm and a shoulder at 269 nm . The particular absorption spectra of other allotropes showed the following characteristic features in the region 190–340 nm. S 6 : 234 nm (maximum), 269 nm (shoulder) S 7 : 222 nm (maximum), 255 nm (shoulder) S 8 : 222 nm (maximum), 264 nm (shoulder) S 10 : 222 nm (maximum), 290 nm (broad shoulder) S 12 : 222 nm (maximum), 320 nm (broad shoulder) …”

Modified cyclodextrins solubilize elemental sulfur in water and enable biological sulfane sulfur delivery

“…33 Aer stirring as solution of 2HPb with S 8 in water for several days and subsequent ltration to remove residual insoluble S 8 , we observed a strong absorbance at 263 nm in the UV-vis spectrum, which is a characteristic absorbance of S 8 . 34 By contrast, stirring S 8 in water under identical conditions but in the absence of 2HPb failed to produce a signicant S 8 absorbance (Fig. 2).…”

“…However, due to the low solubility of S 8 in water we used the extinction coefficient for S 8 in methanol, 6730 M À1 cm À1 at 263 nm, which has been reported previously. 34 To conrm that the extinction coefficient for S 8 in methanol could be used to measure S 8 concentrations in the 2HPb/S 8 complex in water, we rst prepared a solution of S 8 in MeOH at a known concentration (278 mM). We then used the known S 8 /methanol extinction coefficient to measure the concentration of S 8 in an existing 2HPb/S 8 solution.…”

Two‐Step Oxidation Synthesis of Sulfur with a Red Aggregation‐Induced Emission

“…This can be attributed to oxidation of polysulfides or elemental sulfur in the powder after its exposing to air. This is further confirmed by the UV/Vis spectra of the product, with its main absorption peak located at 330 nm and two shoulders at 205 and 236 nm (Figure a, blue lines), which suggest the existence of elemental sulfur . Then, the brown color changes to light yellow, and at that moment the sample starts to emit rather intense red light when excited with UV light (Supporting Information, Movie S2).…”

“…An intense peak at 330 nm with a shoulder at 236 nm is observed in the absorption spectrum (Figure a) of the sample synthesized by heating for 10 h, which is typical for elemental sulfur . An extension of heating time to 48 h or its shortening to 3 h lead to the absence of the peak at 330 nm, and a main peak around 300 nm accompanied with a shoulder peak at 250 nm can be observed (Figure a), corresponding to polysulfide and n→σ* transitions of heteroatoms (S, O) containing nonbonding electrons . An intense red emission, centered at 650 nm, is observed for all three samples, alongside with a well pronounced single photoluminescence excitation (PLE) peak in the UV region (Figure a).…”