The surface chemistry of Diethyl disulfide (cas 110-81-6) on copper

Add time:08/20/2019    Source:sciencedirect.com

The surface chemistry of Diethyl disulfide (cas 110-81-6) (DEDS) is studied on polished copper foils and a Cu(111) single crystal, using temperature-programmed desorption, reflection absorption infrared spectroscopy and X-ray photoelectron spectroscopy. A portion of the DEDS reacts to form ethyl thiolate species even at ~ 80 K, where reaction is complete on heating to ~ 200 K. The resulting thiolate species decompose to form either ethylene or ethane at ~ 380 to ~ 400 K. The selectivity to ethane increases relative to ethylene formation at higher coverages, due to surface crowding that inhibits β-hydride elimination reactions thereby lowering the ethylene yield. Such a change in orientation is confirmed by changes in relative intensities of the ethyl group vibrational modes with coverage.

►Diethyl disulfide is studied on polished copper foils and Cu(111) single crystals ►Ethyl thiolate forms at ~ 200 K ►Ethylene and ethane are formed. ►The selectivity depends on molecular orientation

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