Document Detail


Role of Hydrogen Bonding on the Self-organization of Phenyleneethynylenes on Surfaces.
MedLine Citation:
PMID:  23331130     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A series of carboxylic acid substituted phenyleneethynylenes, having a rigid backbone of 2.7±0.1 nm, were synthesized by following the Heck-Cassar-Sonagashira-Hagihara cross coupling reaction. Hydrogen bonding, through the formation of cyclic dimers of carboxylic acid, is more preferred over catemeric structures in all the molecular systems under investigation. The formation of extended two dimensional patterns on highly oriented pyrolitic graphite (HOPG) surface is dictated by the position as well as number of the carboxylic acid groups on the phenyleneethynylenes. Highly ordered extended arrangements, in the linear and stepwise fashion, were observed when the carboxylic acid groups are attached in the para and meta positions of phenyleneethynylenes. The vital role of the number of carboxylic acid on the organization of molecules is evident in the case of tetracarboxylic acid derivative wherein a Kagome type structure was observed. Further, the co-assembly of two types of phenyleneethynylenes was achieved on HOPG surface through acid base interaction.
Authors:
Pratap Mohan Zalake; K George Thomas
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-19
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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