Synthesis, electrochemical and photochromic behaviour of a series of (1,4-dithiafulven-6-yl)substituted 3H-naphtho[2,1-b]pyran derivatives

The synthesis and electrochemical and photochromic properties of new 3,3-diphenyl-8-(1,4-dithiafulven-6-yl)-[3H]-naphtho[2,1-b]pyran derivatives containing differently substituted dithiafulvenyl units are described. An example of electrochemical dimerization is shown which gives access to electroactive bichromophoric systems. Such systems could allow the study of the interplay of photochromic and electrochemical properties

Transient absorption investigation of the photophysical properties of new photochromic 3H-naphtho[2,1-b]pyran

The photophysical and photochemical properties of two 3,3-diphenyl-3H-naphtho[2,1-b]pyrans substituted in position 8 by phenylethynyl and p-nitrophenylethynyl groups, respectively, are investigated by femtosecond and nanosecond transient absorption spectroscopy. The spectral characteristics and dynamics of the lowest excited singlet and triplet states are determined. The ring-opening reaction responsible for the photochromism is observed to occur in the S1 state. Copyright © 2007 John Wiley & Sons, Lt

Scanning tunneling microscopy of locally derivatized self-assembled organic monolayers

International audienceWe report on the scanning tunneling microscopy (STM) study of self assembled monolayers (SAMs) on Au(1 1 1). SAMs consist of mono and bi-component alkylthiol of various chemical functionnalizations. Such systems give the opportunity to elaborate surfaces with tuned chemical properties. We will show our first results concerning the selective grafting of conjugated organic groups on a bi-component SAM composed of methyl and alcohol terminated molecules.