Document Detail


Absorption and fluorescence spectra of ring-substituted indole-3-acetic acids.
MedLine Citation:
PMID:  15501568     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The absorption and fluorescence spectra of indole-3-acetic acid (1), a plant growth regulator (auxin) and experimental cancer therapeutic, 29 ring-substituted derivatives and the 7-aza analogue (1H-pyrrolo[2,3b]pyridine-3-acetic acid) are compared. Two to four absorbance maxima in the 260-310-nm range are interpreted as overlapping vibronic lines of the 1La<--1A and 1Lb<--1A transitions. Two further maxima in the 200-230-nm region are assigned to the 1Ba<--1A and 1Bb<--1A transitions. 4- and 7-Fluoroindole-3-acetic acid exhibit blue shifts with respect to 1, most other derivatives show red shifts. All indole-3-acetic acids studied, with the exception of chloro-, bromo- and 4- or 7-fluoro-derivatives, fluoresce at 345-370 nm when excited at 275-280 nm. 7-Azaindole-3-acetic acid emits at 411 nm. The fluorescence quantum yield of 6-fluoroindole-3-acetic acid significantly exceeds that of 1 (0.3); the other derivatives have lower quantum yields. The plant-growth promoting activity of the ring-substituted indole-3-acetic acids studied correlates with the position of the 1Bb<--1A transition band.
Authors:
Dejana Carić; Vladislav Tomisić; Marina Kveder; Nives Galić; Greta Pifat; Volker Magnus; Milan Soskić
Related Documents :
8053018 - Extraction of artemisinin and artemisinic acid: preparation of artemether and new analo...
17702198 - Effect of cholic acid and its keto derivatives on the analgesic action of lidocaine and...
18248798 - Development of the semi-synthetic penicillins and cephalosporins.
10864738 - Synthesis and properties of oligodeoxynucleotides incorporating a conformationally rigi...
1935958 - Effect of retinoic acid on the synthesis of tissue-type plasminogen activator and plasm...
17829748 - Release of dissolved amino acids by marine zooplankton.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biophysical chemistry     Volume:  111     ISSN:  0301-4622     ISO Abbreviation:  Biophys. Chem.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-10-25     Completed Date:  2005-06-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0403171     Medline TA:  Biophys Chem     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  247-57     Citation Subset:  IM    
Affiliation:
Faculty of Agronomy, Svetosimunska cesta 25, 10000 Zagreb, Croatia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Hydrogen-Ion Concentration
Indoleacetic Acids / chemistry*
Molecular Structure
Spectrometry, Fluorescence / methods
Spectrophotometry, Ultraviolet / methods
Chemical
Reg. No./Substance:
0/Indoleacetic Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Experiment-guided thermodynamic simulations on reversible two-state proteins: implications for prote...
Next Document:  Interaction of echinomycin with guanine: electrochemistry and spectroscopy studies.