No abstract

A supramolecular array consisting of polyvinylpyridine decorated with adamantyl-substituted Pt(ii) complexes is described. Upon complexation of the adamantyl units with cyclodextrins, a transfer into the aqueous phase can be achieved leading to an oxygen-insensitive phosphorescence. The unique properties arise from a diffusional shielding of the emitters from the environment provided by the compact self-assembled array.

Starting from EuX 2 (X = Cl, Br, I), we systematically investigated a variety of divalent europium complexes containing bidentate 1,10-phenanthroline (Phen) ligands. Depending on the Eu/Phen ratio, mono-, di-, and polynuclear complexes are formed, with the latter yielding one-dimensional ∞ 1 [EuBr 2 (phen)] chains. Seven new divalent europium complexes, [Eu(phen) 4 (H 2 O)]Br 2 •2MeCN, [Eu(phen) 4 ]I 2 •1.7Tol, [EuBr-(phen) 3 ] 2 Br 2 •4MeCN, [EuCl 2 (phen) 2 ] 2 •2MeCN, [EuBr 2 (phen) 2 ] 2 , [Eu-I 2 (phen) 2 ] 2 , and [EuBr 2 (phen)] x , are presented in this work. All species show remarkable optical properties based on a partial electron transfer from the Eu II center to the Phen ligand. The photophysical characterization is further supported by electrochemistry studies in order to describe the intermediate valence of the Eu center.

We report on a new compound composed of a phenanthroline network in which emerging channels are alternately occupied by selenous acid (H2SeO3) and dioxane molecules. The material undergoes a variety of structural changes due to both its redox activity as well as its thermal decomposition. We investigate an internal redox system of the incorporated selenous acid and the aldehyde groups of the phenanthroline framework. The reduction process of the selenium species was further elucidated by cyclic voltammetry, while the oxidation process was also monitored by 1H NMR spectra. The thermal behavior reveals that the material can undergo a reversible, topotactic transition due to dioxane and water (de)­intercalation.