Masaaki Tabata*, Masahiro Ide, Kentaro Kaneko Department of Chemistry, Faculty of Science and Engineering, Saga University, 1, Honjo-machi, Saga, 840 Japan Dedicated to Prof. Hitoshi Ohtaki on the occasion o f his 60th birthday Z. Naturforsch. 50b, 545-550 (1995); received October 26, 1994 Thermochromism, Metalloporphyrin, Equilibrium, Zinc(II) Porphyrin, Mercury(II) Porphyrin Thermochromism wa...

Metalloporphyrins have been regarded as one of the most promising electrocatalysts for oxygen reduction reactions (ORRs) due to their ease structure modification and robust coordinated M−N4 environment. However, electrocatalytic activity, selectivity stability metalloporphyrin-based composite catalysts are often reported be much poorer than those Pt-based materials, arousing researchers devote ...

The reaction of Hg(CF3CO2)2 with metalloporphyrins produces mercurated porphyrins regioselectively, the reaction, surprisingly occurring at the most hindered betaB-position; this behavior is in marked contrast to the usual electrophilic substitution reactions of porphyrins, whose reactions produce meso-substituted porphyrins; the obtained mercurated porphyrins are active to transition metal-cat...

Artificial peptides previously designed to possess alpha-helical bundle motifs have been either hydrophilic (i.e., soluble in polar media) or lipophilic (i.e., soluble in nonpolar media) in overall character. Realizations of these bioinspired bundles have succeeded in reproducing a variety of biomimetic functionality within the appropriate media. However, to translate their functionality into a...

Porphyrins and metalloporphyrins provide an extremely versatile nanometer-sized building block for the control of materials properties. Films, solids and microporous solids have been explored as field-responsive materials (i.e. interactions with applied electric, magnetic or electromagnetic fields) and as ‘chemo-responsive’ materials (i.e. interactions with other chemical species as sensors or ...

15-Crown-5-appended metalloporphyrin causes a K(+)-driven self-organization to bind a bifunctional guest ditopically, thereby allowing the circular dichroism (CD) detection of chirality induced in the ensemble when chiral amines are employed as the guest; the chiroptical properties are discussed.

Porphyrins and N-heterocyclic carbenes (NHCs) are both relevant ligands in the fields of coordination organometallic chemistry. Despite evident structural differences, porphyrins NHCs have a lot common such as their ability to form strong metal-ligand bonds use catalysis, materials science biomedicine. During last decade, several molecular systems combining NHC were reported literature. The pre...