Controlling Electronic Communication in Ethynylated-Polypyridine Metal Complexes

Abstract

By introduction of a naphthalene subunit in the middle of a butadiynylene spacer the triplet lifetime of the ruthenium chromophore in RR is prolongated to 475 ns. By increasing laser intensities the two Ru-terpy terminals are simultaneously promoted to the triplet state, and triplet - triplet annihilation occurs. In contrast, in the mixed Ru/Os complex (RO) the long inherent triplet lifetime of the Os-terpy fragment facilitates reverse triplet energy transfer. terpy=bis(2,2':6',2"-terpyridine).