Synthesis of Molecular Scale Wires

The syntheses of molecular wires that exhibit nearly linear I(V) curves are described in this section. Many of the molecular wires have previously been tested. In each case, the molecular wires bear one or more thioacetyl end groups that can be deprotected, during the self-assembled monolayer (SAM) formation step, to afford the free thiols for attachment to metallic probes. 

K2CO3 and MeOH and then coupled to l-iodo-4-thioacetylbenzene 

X-ray diffraction crystallography of thiol derived from 4 attached to an Os cluster has shown that this oligo(phenylene ethynylene) exists predominantly in a planarized form the phenyl rings being nearly parallel.It is hypothesized that the conductivity of these systems arise through the extended rt-orbital overlap which is maximized while the molecule is planar. If the phenyl rings are skewed from planarity, the TC-orbital overlap is diminished, and then conduction is decreased.  

The solubility of unsubstituted 4 is moderately low in most organic solvents therefore, it was necessary to place n-alkyl side chain moieties on the 

Synthesis of Two-Terminal 01igo(phenylene ethynylene) Molecular 

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Scheme 3.26 Synthesis of molecular-scale wire 41 with one methylene barrier.

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