Beilstein J. Org. Chem.2022,18, 53–69, doi:10.3762/bjoc.18.5
with amino acids to be used as colorimetricindicators, Folin [45] developed a method based on naphthoquinone since there were records in the literature that indicated that naphthoquinones reacted with amines and proteins to form colored products. Among the tested o-naphthoquinones, he found that 1,2
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Graphical Abstract
Figure 1:
Naphthoquinones are commonly used in organic synthesis.
Beilstein J. Org. Chem.2012,8, 486–495, doi:10.3762/bjoc.8.55
orange–yellow in color. Azobenzene coupled DAN and DeUG modules were successfully used as colorimetricindicators for specific DAN–DeUG and DAN–UPy (2-ureido-4(1H)-pyrimidone) quadruply hydrogen-bonding interactions.
Keywords: azobenzene dye; colorimetricindicators; 7-deazaguanine urea (DeUG); 2,7
) by their coupling to azobenzene dyes allowing them to serve as colorimetricindicators for supramolecular interactions. Beyond reporting the straightforward coupling of DAN and DeUG to azobenzene dyes, we show that the dye-recognition-unit conjugates act as selective polymer colorants (Figure 2). The
the possibility of using these compounds as colorimetricindicators, two types of polymers bearing DAN and UPy were used (Figure 4). The DAN modified polystyrene (PS-DAN) was a gift from Dr. Cyrus Anderson and its synthesis will be published elsewhere. Commercially available polystyrene (PS) was used
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Graphical Abstract
Figure 1:
Chemical structures of UPy dimer and DAN complexes with UG and DeUG.