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SUMMARY:Surface-assisted synthesis - a versatile route to novel organic mo
 lecules and polymers
DTSTART:20160609T163000
DTEND:20160609T173000
DTSTAMP:20260407T175810Z
UID:123eaace96de48fac38317464a1a98586e579f15a46a8677fb694205
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Michael Gottfried\nPhilipps-Universität Marburg\nDepart
 ment of Chemistry\, Physical Chemistry\nSurface-assisted synthesis of orga
 nic molecules\, polymers\, metal complexes\, and organo-metallic compounds
  is a promising approach for surface modification and functionalization. S
 urface reactions can produce compounds which are not accessible by convent
 ional synthesis in solution or which are too large or too reactive for vap
 or deposition. Catalytic and template effects exerted by the surface can h
 elp driving the reaction into the desired direction. The major challenges 
 are structural control and selectivity\, because post-reaction separation 
 and purification\, which are widely applied in solution-based synthesis\, 
 are difficult to perform on surfaces. This lecture focuses primarily on C-
 C coupling reactions of haloarenes on metal surfaces and their investigati
 on with spectroscopic and microscopic techniques. Temperature-dependent st
 udies show that the carbon-halogen bonds dissociate already at low tempera
 tures and are replaced by carbon-metal-carbon bonds\, resulting in the for
 mation of linear\, cyclic or two-dimensional organometallic oligomers and 
 polymers. Formation of covalent C-C bonds is achieved at elevated temperat
 ures. The hexagonal\, fully conjugated honeycombenes are prominent example
 s for a class of macrocyclic hydrocarbons for which no solution-based synt
 hesis is available\, but which are obtained by on-surface synthesis. As ro
 om-temperature stable intermediates\, the corresponding organometallic mac
 rocycles are observed. Surface template effects were studied in the synthe
 sis of low-dimensional organic nanostructures on different Cu surfaces\, i
 .e.\, Cu(111)\, Cu(110) and Cu(110)-(2x1)O. The latter shows the 'piano ke
 yboard' type pattern consisting of alternating stripes of bundled Cu-O cha
 ins and bare Cu(110). Since the reaction proceeds exclusively on the bare 
 Cu stripes\, the pattern provides a spatial confinement. Depending on the 
 width of the Cu stripes\, either 1D zigzag organometallic oligomeric chain
 s with different lengths or organometallic macrocycles with different size
 s are obtained. Finally\, examples for structure formation of intact haloa
 renes are presented.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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