Reconstruction of rod self-aggregates of natural bacteriochlorophylls-c from Chloroflexus aurantiacus

Self‐Assemblies of Zinc Bacteriochlorophyll‐d Analogues Having Amide, Ester, and Urea Groups as Substituents at 17‐Position and Observation of Lamellar Supramolecular Nanostructures

“…The lamellar spacing of 1.5 nm is shortert han the straight length of the 17-substituent chain.T he chain at the 17-position of the present BChl-d analogue might be partly folded by the additional interaction of hydrogen-bonding amide and/or urea moieties as well as its hydrophobic interactions in the solid self-assemblies. The supramolecular nanostructures of Zn-2-4 self-assemblies prepared from as olution in 1vol %T HF/99 vol %h exane (100 mm)w ere observedb yA FM.T he AFM images of Zn-2-4 self-assemblies showed rodlike nanostructures with ah eight of 5nm( Figure S4), similar to the previously reported supramolecular round-shaped tubes (rods) of chlorosomals elf-assemblieso fZn-1 [89,90] as wella si nv ivo [36,40,48] and in vitro [81] BChl-c self-assemblies of Cfl. aurantiacus (Figures S4 a, b, and d).…”

“…One of the individual rods had a height of 12 nm and a length of 500 nm with an aspect ratio of (Figure 4 a–c). These present rods are larger than the chlorosomal round tubes of 5 nm diameter formed by self‐assemblies of Zn‐1 and zinc BChl‐ d analogues as well as in vivo and in vitro round rods of BChl‐ c self‐assemblies of Cfl. aurantiacus .…”

“…The supramolecular nanostructures of Zn‐2 – 4 self‐assemblies prepared from a solution in 1 vol % THF/99 vol % hexane (100 μ m ) were observed by AFM. The AFM images of Zn‐2 – 4 self‐assemblies showed rodlike nanostructures with a height of 5 nm (Figure S4), similar to the previously reported supramolecular round‐shaped tubes (rods) of chlorosomal self‐assemblies of Zn‐1 as well as in vivo and in vitro BChl‐ c self‐assemblies of Cfl. aurantiacus (Figures S4 a, b, and d).…”

Stereoselective Self‐Aggregation of 31‐Epimerically Pure Amino Analogs of Zinc Bacteriochlorophyll‐d in an Aqueous Micelle Solution

“…The driving forces in the self‐aggregation of such BChl molecules are intermolecular coordination and hydrogen‐bonding (Mg···OH···O=C) as well as π – π interaction of chlorin rings . The closely packed and well‐ordered self‐aggregates promote exciton coupling of the composite pigments, giving rod‐like supramolecules with large Qy absorption maxima at > 700 nm region . The resulting π ‐electron delocalized supramolecules are useful for efficient collection of low‐light energy and rapid migration of exciton energy .…”

The thermal deactivation of all-trans and 15-cis beta-carotene-excited states in the ionic liquids without and with methylenoxy group

“…Photoacoustic spectroscopy is a technique providing detailed information, for example, on the photosynthetic system and structure of plants [15]. One can use the photoacoustic spectroscopy to quantify parameters characterizing plants such as: chemical composition, efficiency of photosynthetic oxygen evolution, photochemical energy storage, photosynthetic action spectra, time of photo-thermal signal creation in a photoacoustic cell (heterogeneity of PS II), the coefficient of oxygen diffusion through the cell wall, the sample depth profiling, the light-saturation curve and kinetics of nonphotochemical quenching on different plants [15,16].…”