Inductive Effects in Ruthenium-Modified Amino Acids

Abstract

Emission spectroscopy has been used to probe and quantify electronic interactions mediated by alkyl side chains in a homologous series of amino acids. The ω-amine functions of diaminopropionic acid (DAPA), diaminobutyric acid (DABA), ornithine, and lysine were covalently labeled with a luminescent [Ru(bipy) 3 ] 2+ fragment. Protonation of the α-amine function results in a significant dependence of nonradiative excited-state decay rates on the number of methylene groups, n, in the respective side chain. Two analogous series of compounds in which the α-amino acid moiety was replaced by [a]

Selective Recognition of Copper(II) by a Water-Soluble, Emitter-Receptor Conjugate Containing a Ruthenium Chromophore, a Lysine Bridge, and a Cyclen Unit

“…modified amino acids in much detail. [21,22] Our results show that [Ru(bipy) 2 m] 2ϩ -substituted lysine (8; bipy ϭ 2,2Ј-bipyridyl; m ϭ 4-carbonyl-4Ј-methyl-2,2Ј-bipyridyl) is an ideal chromophore-spacer unit for the synthesis of pHindependent emitter-receptor conjugates. The butylamine side chain is long enough to prevent electronic coupling between the site of protonation and the chromophore.…”

Poly(Methylsilsesquioxane) with Encapsulated Ru(III) Complex

“…5) should coordinate the metal atom. [18] The 270 nm absorption band was assigned to a pp à (Py) transition due to the extension of the electron p-system of the ligand. [16,17] UV-VIS spectra have been measured for the CH 3 CN solution of the complex (Fig.…”