Bioorganometallic Chemistry. 7. A Novel, Linear, Two-Coordinate Rh(I) Anionic Amide Complex Formed by the Reaction of the Nucleobase, 1-Methylthymine, with the [(Cp*Rh)2(.mu.-OH)3]+ Cation at pH 10: Molecular Recognition and Electrostatic Interaction within an Organometallic Hydrophobic Cavity