SYNTHESIS AND CHARACTERIZATION OF UNSYMMETRIC FERROCENE-TERMINATED PHENYLETHYNYL OLIGOMERS CP(2)FE-[C-C-C6H4](N),-X(X=SH, SME, SOME, AND SO(2)ME)

The syntheses and full characterization of the titled compounds are de scribed for X = SH and n = 1-3 (1a-c), X = SMe and n = 1-4 (2a-d), X = SOMe and n = 1 and 2 (3a,b), and X = SO(2)Me and n = 1-3 (4a-c). In a ddition, the molecular structure of 2b has been determined by crystall ographic analysis. Single crystals of 2b are (at 23 degrees C) monocli nic, space group P2(1)/c, with a = 6.031(2) Angstrom, b = 33.457(12), c = 10.364(4) Angstrom, beta = 90.90(3)degrees, V = 2091.2(13) Angstro m(3), and Z = 4 (D-calcd = 1.373 mg m(-3); mu(Mo K alpha) = 0.831 mm(- 1)). The availability of compounds 1a-c should prove useful for invest igating the factors which govern the rate of electron transfer across interfacial barriers such as those presented by self-assembled monolay er (SAM) structures.