Water coordinated zinc dioxo-chlorin and porphyrin self-assemblies as chlorosomal mimics: Variability of supramolecular interactions
Artikel i vetenskaplig tidskrift, 2012
Semisynthetic zinc chlorins are shown for the first time to self-assemble in the absence of an intrinsic hydroxy group, which is always present in the chlorosomal bacteriochlorophylls (BChl's) c, d and e. Instead, the presently studied compounds have carbonyl groups. These cannot function as hydrogen bond donating groups. However due to interspacing water molecules bound to the zinc ion, double hydrogen bonding can occur to adjacent tetrapyrrolic macrocycles equipped with carbonyl recognition groups. Solution studies comprising UV-Vis absorption, electronic circular dichroism (ECD) and FT-IR show that different aggregates are formed in hydrated solvents in comparison to dry nonpolar solvents. Single crystal X-ray studies show variable supramolecular interactions either with interspacing water molecules coordinating the Zn ion within a porphyrin or with the 17 2 carbonyl group of a chlorin ligating the Zn ion. Our findings have implications for a minimalistic design of self-assembling chromophores, which can act as efficient light-harvesting units.
Författare
Aldo Jesorka
Kemi och biokemi - doktorander
A. R. Holzwarth
Max-Planck-Institut für Bioanorganische Chemie
Andreas Eichöfer
Karlsruher Institut für Technologie (KIT)
Chilla Malla Reddy
Indian Institute of Science
Karlsruher Institut für Technologie (KIT)
Y. Kinoshita
Ritsumeikan Universitet
Hitoshi Tamiaki
Ritsumeikan Universitet
M. Katterle
Max-Planck-Institut für Bioanorganische Chemie
Jean-Valere Naubron
Aix-Marseille Université
Teodor Silviu Balaban
Aix-Marseille Université
Karlsruher Institut für Technologie (KIT)
Max-Planck-Institut für Bioanorganische Chemie
Photochemical and Photobiological Sciences
1474-905X (ISSN) 1474-9092 (eISSN)
Vol. 11 6 1069-1080Ämneskategorier
Oorganisk kemi
Fysikalisk kemi
Teoretisk kemi
DOI
10.1039/c2pp25016k
PubMed
22522667