Synthesis and spectroscopic properties of ethynylsulfur pentafluoride (SF5C.tplbond.CH)

Abstract

3668an increase in the energy of ligand field states, this nonproductive deactivation channel is removed and the efficiency of photosensitization is greatly increased.Inorg. Chem. 1985, 24, 3668-3670 are currently attempting to grow large single crystals of PBC in order to study the photoconductivity and other electrical properties of this material.--Using these two criteria, it should be possible to design many Magnus-type materials that will be photoactive. Whether photoactivity is merely a result of light absorbed by surface chromophores or whether cooperative electronic structure allows transfer of excitons (or perhaps conduction-band electrons) from the bulk to the surface is a question of central importance to the study of these materials. From a theoretical viewpoint3* it is very likely that some variation of an exciton model applies to the d p states of ds linear-chain materials, and therefore bulk excitation is mobile. This study demonstrates that excitation can be harvested at the solid-liquid interface in redox processes. We (32) Day, P. Reference 7c, Chapter 7. Acknowledgment. We thank Carl Craig and Professor Richard J. Watts at the University of California, Santa Barbara, CA, for lifetime and emission data, Dr. John S. Connolly at SERI for access to equipment in his laboratory and assistance with nanosecond lifetime measurements, Alex Miedaner at SERI for the synthesis of P t ( b p~)~~+ and Pt(bpy)(MHB)2', and Dr. Vincent Miskowski at the Jet Propulsion Laboratory for many helpful discussions. Ethynylsulfur pentafluoride, SF5C=CH, has been prepared by the dehydrobromination of SF&H=CFBr (49%). It also can be obtained in a four-step process by the addition of SF5Br to acetylene, followed by bromination of the resulting olefin, SF5C-H=CHBr, to form SF5CHBrCHBr2, which may be dehydrobrominated with K2C03 to give SF5CBr=CHBr. The latter, when treated with Zn, gives SF5C=CH in an overall yield of 9%.

New acrylate systems: derivatives of β-SF5-acrylic acid

“…The J SF5-CH cis coupling values are near 0 or absent for SF 5 CH¼CH 2 [17], SF 5 CBr¼ CHCl [19], SF 5 CH¼CHCl [18], SF 5 CH¼CHOCH 3 [18], SF 5 CBr¼CHBr [20], SF 5 CCl¼CH 2 [21] and SF 5 CBr¼ CHCl [16]. Also of interest is the J SF5-CH trans interaction; for SF 5 CH¼CH 2 [17], SF 5 CH¼CHOCH 3 [18], SF 5 CBr¼ CHBr [20], and SF 5 CCl¼CH 2 [21], and trans-SF 5 CBr¼CHCl [19] the coupling values are 2.3, 3, 3.0, 3.3 and 2.2 Hz, respectively. It is clear from our data that all new compounds (1-3) have SF 5 CH¼ arrangement based on the values for the geminal coupling.…”

The reaction of SF5Br with select 1,2-dihaloethylenes

“…The reaction of SF 5 Br with acetylene also produces SF 5 CH CHBr and is an alternative method for preparing this compound [8]. The new method presented in this paper (see Eq.…”

New pentafluorothio(SF5) alkylsulfonic acids

“…In the 'H nmr spectra of the acids and their salts, it is observed that the chemical shifts of the protons are in the region expected for SF5 hydrocarbons; the protons are found in the -4-7 ppm range (4,5). In three cases the couplings of the equatorial fluorines (SF4) and the couplings of the aliphatic fluorines to the a protons could be determined; for the rest a complex multiplet was observed.…”