Number of the records: 1
Self-Aggregates of Cationic meso-Tetratolylporphyrins in Aqueous Solutions
- 1.
SYSNO ASEP 0181586 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Self-Aggregates of Cationic meso-Tetratolylporphyrins in Aqueous Solutions Author(s) Kubát, Pavel (UFCH-W) RID, ORCID, SAI
Lang, Kamil (UACH-T) SAI, RID, ORCID
Procházková, Kristýna (UFCH-W)
Anzenbacher Jr., P. (US)Source Title Langmuir. - : American Chemical Society - ISSN 0743-7463
Roč. 19, č. 2 (2003), s. 422-428Number of pages 7 s. Language eng - English Country US - United States Keywords porphyrins ; DNA ; point-dipole Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA203/01/0634 GA ČR - Czech Science Foundation (CSF) GA203/02/0420 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z4032918 - UACH-T AV0Z4040901 - UFCH-W Annotation Aggregation properties of meso-tetratolylporphyrins bearing cationic substituents of a lipophilic nature such as ammonium, pyridinium, phosphonium, sulfonium, and isothiouronium were studied by UV/vis and resonance light scattering spectroscopy. The exciton point-dipole approximation was used to predict the structural alignment of the porphyrin units within the aggregate. The contribution of various types of aggregates depends on the porphyrin substitution, ionic strength, and temperature of aqueous solution of the porphyrin. In general, the preferred structure of an aggregate formed by temperature-induced aggregation is the J-aggregate exhibiting the characteristically narrow, red-shifted Soret band indicating a parallel "side-by-side" arrangement of the porphyrin units. The formation of aggregates of cationic tetratolylporphyrins is controlled by both electrostatic and hydrophobic interactions, Observed aggregation properties of porphyrin derivatives bearing trimethylammonium. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2004
Number of the records: 1