John E. Bulkowski

Tetraphenylporphyrin monolayers: Formation at the air-water interface and characterization on glass supports by absorption and fluorescence spectroscopy

Abstract Surface pressure-area characteristics of several tetraphenylporphyrins and surfactant analogs were investigated at the air-water interface. Free base and metallotetraphenylporphyrins do not form stable monomolecular layers, as is also the case with n -decyl and n -octadecyl Co(III)TPP derivatives. However, in the presence of a stoichiometric amount of an amphipathic pyridine derivative, 4- N,N -dioctadecylaminopyridine, these porphyrins do form stable monolayers. Surface pressure-area measurements indicated that the porphyrins were oriented with the porphyrin rings perpendicular to the subphase surface. The monolayers were characterized by visible absorption and fluorescence spectroscopy after transfer of the monolayers to glass slides using Langmuir-Blodgett techniques.

Binuclear rhodium(I) complexes. Synthesis of [Rh(COD)]2L(OAc)2 where L is the new 22-membered macromonocycle 1,4,7,12,15,18-hexaazacyclodocosane

Abstract Reaction of [Rh(COD)(OAc)]2 with the new 22-membered macromonocyclic hexaamine 1,4,7,12,15,18-hexaazacyclodocosane (L) yields the binuclear species [Rh(COD)]2L(OAc)2- Comparison with a mononuclear model complex formed from diethylethylenediamine (DEEN) indicates that the binuclear compound contains two Rh(COD) units, each bound to two ligand nitrogens. The synthesis, spectra, and properties of the complexes [Rh(COD)]2L(OAc)2 and Rh(COD)(DEEN)(OAc) are reported.