The reaction of squaric acid (H2SQ) with three pyridine-appended boronic acid derivatives (BA), viz. 4-pyridinylboronic acid (1BA), 3-pyridinylboronic acid (2BA), and (4-(pyridin-4-yl)phenyl)boronic acid (3BA), leads to the formation of supramolecular zwitterions of the general formula [SQ(BAH)2]·xH2O generated by proton transfer from the squaric acid to the pyridine sites. The zwitterion [SQ(1BAH)2]·2H2O can further react with the neutral molecule bipyridine (bpy) leading thus to a ternary system of the general formula [SQ(1BAH)2]·bpy.
Fornasari L., D'Agostino S., Braga D. (2019). Supramolecular zwitterions based on a novel boronic acid-squarate dianion synthon. CRYSTENGCOMM, 21(20), 3186-3191 [10.1039/c9ce00367c].
Supramolecular zwitterions based on a novel boronic acid-squarate dianion synthon
Fornasari L.;D'Agostino S.;Braga D.
2019
Abstract
The reaction of squaric acid (H2SQ) with three pyridine-appended boronic acid derivatives (BA), viz. 4-pyridinylboronic acid (1BA), 3-pyridinylboronic acid (2BA), and (4-(pyridin-4-yl)phenyl)boronic acid (3BA), leads to the formation of supramolecular zwitterions of the general formula [SQ(BAH)2]·xH2O generated by proton transfer from the squaric acid to the pyridine sites. The zwitterion [SQ(1BAH)2]·2H2O can further react with the neutral molecule bipyridine (bpy) leading thus to a ternary system of the general formula [SQ(1BAH)2]·bpy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
