Surface chemistry of ethylenediamine (NH2CH2CH2NH2) on Pt(111)

Reflection absorption infrared (RAIR) spectroscopy and temperature programm ed desorption have bern used to study the adsorption and reaction chemistry of ethylenediamine on Pt(1 1 1) over the temperature range of 80-550 K. In agreement with previous studies, ethylenediamine is found to adsorb withou t dissociation between 80 and 300 K. At 360 K, large changes in the RAIR sp ectra reveal that the molecule rearranges to form a new surface species, wh ich is identified as diaminoethylene, H2NCCNH2. At temperatures above 360 K , diaminoethylene decomposes to form aminomethylidyne, CNH2. (C) 2000 Elsev ier Science B.V. All rights reserved.