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%.

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