The surface characterization of a series of hydroxybenzenes on Ag(111): An EELS and TDS study

Thesis/Dissertation · Tue Jan 26 23:00:00 EST 1993

OSTI ID:10131374

Nielsen, B S

Interaction of a series of hydroxybenzenes with Ag(111) is investigated by thermal desorption spectroscopy (TDS) and high resolution electron energy loss spectroscopy (EELS). Studied were the mono-hydroxybenzene, phenol, the o-, m- and p-dihydroxybenzenes, catechol, resorcinol, hydroquinone, respectively, and the 1,2.3-trihydroxybenzene, pyrogallol. Dehydrogenation of the hydroxyl groups upon adsorption is not directly observed in the TDS studies: however, the EELS results suggest possible dehydrogenation. The apparent O-H bond scission is attributed to hydrogen bonding between the surface molecules or to the orientation of the O-H bond aids with respect to the metal surface. Orientations of the mono- and dihydroxybenzene molecules are temperature dependent, whereas that of the trihydroxybenzene may be attributed to the number and position of the hydroxyl substitutents. Phenol and catechol both undergo an inclined-to-perpendicular orientational change. Resorcinol and hydroquinone undergo a perpendicular-to-inclined transformation. Finally, pyrogallol remains inclined at all temperatures until decomposition.

• Research Organization: Ames Lab., IA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 10131374
• Report Number(s): IS-T--1541; ON: DE93007541
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
ADSORPTION
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
DEHYDROGENATION
DESORPTION
ENERGY-LOSS SPECTROSCOPY
ORIENTATION
PHENOLS
PHYSICAL PROPERTIES
POLYPHENOLS
PYROCATECHOL
PYROGALLOL
RESORCINOL
SILVER
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE