Naokazu Yoshikawa
Nara Women’s University, Japan
Title: Anion influence of emission properties and DFT calculations of diprotonated and triprotonated terpyridines
Biography
Biography: Naokazu Yoshikawa
Abstract
Triprotonated and diprotonated compounds [(L)H3]3+ and [(L)H2]2+ were prepared by the reaction of (L = terpy, tterpy and Clterpy) with a variety of acid (HF, HCl, HBr, H2SO4, and H3PO4) in water. Protonated pyridine rings are hydrogen bonded intramolecularly to the adjacent anion and intermolecularly to the adjacent PF6- in compounds. These hydrogen bonds restrain the nonradiative decay to produce intense emission. Density functional theory was applied to interpret the planarity in compounds. The attachment of two protons to the nitrogen in [(terpyH2)H2O]2+ and[(tterpyH2)H2O]2+ lead to the strong emission in acetonitrile (F = 0.29 and 0.30, respectively). The attachment of two protons to the peripheral nitrogens in [(terpyH2)H2O]2+and intermolecularly hydrogen bonded to the two adjacent F atoms in PF6-, which results in exhibiting a strong emission with a large quantum yield.