| dc.description.abstract | The syntheses of two new series of ruthenium(II) complexes incorporating substituted 4-phenylterpyridine,
triphenylphosphine, and chloride (A Series) or hydride (B Series) are reported. In
both series 4-phenyl-terpyridine incorporated substituents of varying electronic character at the
4-position: 4-(4-chlorophenyl)-2,2:6,2-terpyridine (ClPh-tpy); 4-(4-nitrophenyl)-2,2:6,2-terpyridine
(NO2Ph-tpy) and 4-(4-methoxyphenyl)-2,2:6,2-terpyridine (OMePh-tpy). The complexes have
been characterized by elemental analysis and UV-vis, IR, and NMR spectroscopy and their
electrochemical properties studied. The substituents on the 4-phenyl-terpyridine ligand influence
the properties of the metal center. For all complexes prepared, (max) of a characteristic low
energy band in the UV-vis spectrum was found to move to shorter wavelengths as the solvent
polarity increased (a hypsochromic shift). For the B series complexes, the low energy band was
broader and undergoes a small shift to lower frequencies as a result of the substitution of
chloride by a hydride. The H-1 and P-31 NMR spectra clearly indicate that the geometry of the
4-phenyl-terpyridine ligand is meridional in the complexes, with the two triphenylphosphines
trans to each other. Upon optimization of the experimental procedures the yields increased to
70% for the B series complexes. | |
