The electrochemical coupling of NO3− and CO2 to produce urea using entangled iron porphyrins embedded in three-dimensional covalent organic frameworks is reported. The spatial localization of twin iro...

Porphyrins, phthalocyanines and their numerous analogues and derivatives are materials of tremendous importance. The journal represents a timely ongoing research in this field.

Though electret materials are attractive for realizing flexible mechanoelectrical devices, these materials are typically solid films. Here, the authors report stretchable ‘liquid-electret’ devices con...

A series of chiral synthetic compounds is reported that shows intricate but specific hierarchical assembly because of varying positions of coordination and hydrogen bonds. The evolution of the aggregates (followed by absorption spectroscopy and temperature-dependent circular dichroism studies in solution) reveal the influence of the proportion of stereogenic centers in the side groups connected to the chromophore ring in their optical activity and the important role of pyridyl groups in the self-assembly of these chiral macrocycles. The optical activity spans 2 orders of magnitude depending on composition and constitution. Two of the aggregates show very high optical activity even though the isolated chromophores barely give a circular dichroism signal. Molecular modeling of the aggregates, starting from the pyridine–zinc(II) porphyrin interaction and working up, and calculation of the circular dichroism signal confirm the origin of this optical activity as the chiral supramolecular organization of the molecules. The aggregates show a broad absorption range, between approximately 390 and 475 nm for the transitions associated with the Soret region alone, that spans wavelengths far more than the isolated chromophore. The supramolecular assemblies of the metalloporphyrins in solution were deposited onto highly oriented pyrolitic graphite in order to study their hierarchy in assembly by atomic force microscopy. Zero and one-dimensional aggregates were observed, and a clear dependence on deposition temperature was shown, indicating that the hierarchical assembly took place largely in solution. Moreover, scanning electron microscopy images of porphyrins and metalloporphyrins precipitated under out-of-equilibrium conditions showed the dependence of the number and position of chiral amide groups in the formation of a fibrillar nanomaterial. The combination of coordination and hydrogen bonding in the complicated assembly of these molecules—where there is a clear hierarchy for zinc(II)-pyridyl interaction followed by hydrogen-bonding between amide groups, and then van der Waals interactions—paves the way for the preparation of molecular materials with multiple chromophore environments.

Porphyrins are produced at scale through metabolic engineering and optimization of CPIII purification.

Heme nitrite reductases (NiRs) are key enzymes in the assimilatory and dissimilatory reduction of nitrite (NO2–) by 6e–/8H+ to NH4+ and by 1e–/2H+ to NO during denitrification in the global nitrogen c...

Model thiophene-decorated nickel porphyrins are synthesized to examine how sulfur promotes CO2-to-CO conversion and tandem CO2-to-C2 product conversion in electrocatalytic CO2 reduction. Combined theoretical and experimental analyses show that thiophene substituents generate a ligand hole character that modulates the nickel-centred electronic structure, enhancing overall catalytic performance.

Heme biosynthesis is tightly coordinated to support essential functions without accumulating toxic porphyrins and depleting cellular iron. Heme induces degradation of the heme biosynthetic enzyme, 5-a...

Bioluminescence has been recognized as an important means for inter- and intra-species communication. A growing number of reports of red fluorescence occurring in keratinaceous materials have become a...