(A) Synthesis of conjugated oligomers of precise length and constitution; (B) Alkylsulfonyltrichlorosilanes for negative resists; (C) Interfacing single-walled carbon nanotubes with diamines

Chapter 1 describes an unexpected rearrangement/oxidation of N-substituted-2,5-dibromopyrroles upon treatment with HNO3. Several termaleimides were prepared maleic anhydride and citraconic anhydride. These trimeric compounds underwent enormous shifts in their optical absorbance maxima (ca. 200 nm) when bases or nucleophilic solvents were added.; Chapter 2 describes a new iterative divergent/convergent solid phase synthesis of precisely defined oligomers. The solid-supported material grows in two directions. Therefore, after each iteration, the oligomer length is more than tripled. The efficiency of this methodology is demonstrated by the synthesis of a 17-mer oligo(1,4-phenylene ethynylene) of approximately 120 A length in seven steps with an overall 20% yield. This solid-supported divergent/convergent tripling protocol is also used for the synthesis of an [AB] alternating block 23-mer containing oligo(1,4-phenylene ethynylene)s and oligo(2,5-thiophene ethynylene)s in an overall 21% yield. The length of the 23-mer is approximately 160 A.; Chapter 3 describes two directional synthesis of oligo(1,4-phenyleneethynylene)s.; Chapter 4 describes the synthesis of three molecular systems used in self-assembled monolayer (SAM) preparations on SiO2/Si.; Chapter 5 describes using diamines to connect short SWNTs.