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Scanning tunneling microscopy of dimeric and polymeric products of electroreduced (Re(CO) sub 3 (4-vinyl,4 prime -methyl-2,2 prime -bipyridine)Cl)

Journal Article · · Journal of the American Chemical Society; (USA)
DOI:https://doi.org/10.1021/ja00160a006· OSTI ID:7068811
;  [1]; ;  [2]
  1. Univ. of Minnesota, Minneapolis (USA)
  2. Cornell Univ., Ithaca, NY (USA)
+ Show Author Affiliations
Scanning tunneling microscopy (STM) was used to image adsorbed products resulting from electroreduction of (Re(CO){sub 3}(vbpy)Cl) (vbpy = 4-vinyl,4{prime}-methyl-2,2{prime}-bipyridine) on highly oriented pyrolytic graphite (HOPG). STM images, in air, of HOPG electrodes following electroreduction of (Re(CO){sub 3}(vbpy)Cl) (in acetonitrile/0.1 M tetra-n-butylammonium perchlorate) by cycling the potential between 0 and {minus}2.0 V vs a sodium saturated colomel electrode (SSCE) show molecular species uniformly distributed on the surface including approximately dumbbell shaped molecules ({approx} 40 {times} 20 {angstrom}). The size and shape of these aggregates is consistent with products derived from vinyl-vinvyl coupling of Re-Re bonded dimers: ((vbpy)(CO){sub 3}Re-Re(CO){sub 3}(vbpyH-vbpyH)(CO){sub 3}Re-Re(CO){sub 3}(vbpy)). STM images of electrodes prepared by cycling the potential between 0 and {minus}1.45 V vs SSCE (less reducing conditions) show highly nonuniform coating of the surface by polymer. Several polymer morphologies were observed with polymer nucleation preferentially occurring at step sites on HOPG.
OSTI ID:
7068811
Journal Information:
Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:4; ISSN 0002-7863; ISSN JACSA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
CALCULATION METHODS
CARBON
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA ANALYSIS
DIMERS
ELECTROCHEMISTRY
ELECTRON MICROSCOPY
ELEMENTAL MINERALS
ELEMENTS
FILMS
GRAPHITE
MEASURING INSTRUMENTS
MEASURING METHODS
MICROSCOPY
MINERALS
NONMETALS
POLYMERS
REDUCTION
RHENIUM COMPLEXES
SCANNING ELECTRON MICROSCOPY
TRANSITION ELEMENT COMPLEXES