Next Article in Journal
Wisteria floribunda Agglutinin-Positive Mac-2 Binding Protein as a Screening Tool for Significant Liver Fibrosis in Health Checkup
Next Article in Special Issue
Comparing Molecular Mechanisms in Solar NH3 Production and Relations with CO2 Reduction
Previous Article in Journal
Amniotic Fluid Stem Cell-Derived Extracellular Vesicles Counteract Steroid-Induced Osteoporosis In Vitro
Previous Article in Special Issue
Gold Nanoparticle Formation via X-ray Radiolysis Investigated with Time-Resolved X-ray Liquidography
Open AccessArticle

Role of Cobalt(III) Cationic Complexes in the Self-Assembling Process of a Water Soluble Porphyrin

1
Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina and C.I.R.C.M.S.B V.le F. Stagno D’Alcontres, 31-98166 Messina, Italy
2
CNR—ISMN Istituto per lo Studio dei Materiali Nanostrutturati c/o Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, V.le F. Stagno D’Alcontres, 31-98166 Messina, Italy
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2021, 22(1), 39; https://doi.org/10.3390/ijms22010039
Received: 8 December 2020 / Revised: 18 December 2020 / Accepted: 20 December 2020 / Published: 22 December 2020
(This article belongs to the Collection Feature Papers in Physical Chemistry and Chemical Physics)
Under moderate acidic conditions, the cationic (+3) complexes ions tris(1,10-phenanthroline)cobalt(III), [Co(phen)3]3+, and hexamminecobalt(III), [Co(NH3)6]3+, efficiently promote the self-assembling process of the diacid 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (H2TPPS4) into J-aggregates. The growth kinetics have been analyzed according to a well-established autocatalytic model, in which the rate determining step is the initial formation of a nucleus containing m porphyrin units (in the range 2–3), followed by a stage whose rate constant kc evolves as a power of time. The observed catalytic rate constants and the extent of J-aggregation increase on increasing the metal complex concentration, with the phen complex being the less active. The UV/Vis extinction spectra display quite broad envelops at the J-band, especially for the amino-complex, suggesting that electronic dipolar coupling between chromophores is operative in these species. The occurrence of spontaneous symmetry breaking has been revealed by circular dichroism and the measured dissymmetry g-factor decreases on increasing the aggregation rates. The role of these metal complexes on the growth and stabilization of porphyrin nano-assemblies is discussed in terms of the different degree of hydrophilicity and hydrogen bonding ability of the ligands present in the coordination sphere around the metal center. View Full-Text
Keywords: porphyrins; J-aggregates; aggregation kinetics; symmetry breaking; chiral supramolecular assemblies porphyrins; J-aggregates; aggregation kinetics; symmetry breaking; chiral supramolecular assemblies
Show Figures

Figure 1

MDPI and ACS Style

Manganaro, N.; Zagami, R.; Trapani, M.; Castriciano, M.A.; Romeo, A.; Scolaro, L.M. Role of Cobalt(III) Cationic Complexes in the Self-Assembling Process of a Water Soluble Porphyrin. Int. J. Mol. Sci. 2021, 22, 39. https://doi.org/10.3390/ijms22010039

AMA Style

Manganaro N, Zagami R, Trapani M, Castriciano MA, Romeo A, Scolaro LM. Role of Cobalt(III) Cationic Complexes in the Self-Assembling Process of a Water Soluble Porphyrin. International Journal of Molecular Sciences. 2021; 22(1):39. https://doi.org/10.3390/ijms22010039

Chicago/Turabian Style

Manganaro, Nadia; Zagami, Roberto; Trapani, Mariachiara; Castriciano, Maria A.; Romeo, Andrea; Scolaro, Luigi M. 2021. "Role of Cobalt(III) Cationic Complexes in the Self-Assembling Process of a Water Soluble Porphyrin" Int. J. Mol. Sci. 22, no. 1: 39. https://doi.org/10.3390/ijms22010039

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop