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3 Polish Journal of Chemistry

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Hydrogen Bonds in Boronic Acids and Their Complexes

Sporzyński A.

Polish Journal of Chemistry

2007

Vol. 81, nr 5-6

757-766

The structures of arylboronic acids, ArB(OH)2, are reviewed. These structures are different depending on the substituents in the aromatic ring. The main types of such forms are hydrogen-bonded dimers and chains in which the second B-OH group forms a hydrogen bond with donor atom. Diboronic acids form two-dimensional networks. The presence of an electron donor group in ortho position usually leads to the formation of intramolecular hydrogen bond, but in some cases intermolecular interactions are also observed. Heterodimers with anions of carboxylic acids and with amino acids are the stable complexes, in opposite to the complexes with monofunctional Lewis bases.

Complexes of Benzeneboronic Acid and Triphenylboroxin with Amines

Sporzyński A., Lewandowski M., Zarychta B., Zaleski J.

Polish Journal of Chemistry

2005

Vol. 79 / nr 7

1099-1105

Benzeneboronic acid reacts with aliphatic amines to give a stable 1:1 complex formed by triphenylboroxin with an amine molecule. The structure of the complex of triphenylboroxin with n-butylamine (1) has been determined by X-rays. Several complexes with other amines have been characterized spectroscopically. The equilibrium in the system depends on the amine and the solvent nature.

Solubilities of organoboron compounds in organic solvents. 6. Solid-liquid equilibria of substituted pyrazaboles in alcohols and toluene

Dąbrowski M., Serwatowski J., Sporzyński A.

Polish Journal of Chemistry

1998

Vol. 72, nr 11

2423-2431

The solubility of substituted pyrazaboles: 1,3,5,7-tetramethylpyrazabole (TMP) and 1,3,5,7-tetramethyl-4,4,8,8-tetraphenylpyrazabole (TMTFP) in methanol, ethanol, 2-propanol, tert-butanol and toluene have been determined by a dynamic method at temperatures ranging from the boiling point of the solvent to 285 K. Introduction of the substituents to a pyrazabole molecule strongly decreases the solubility in alcohols. The results have been correlated by the Wilson. UNIQUAC and UNIQUAC ASM equations. The best results were obtained for UNIQUAC ASM equation with the average root mean square deviation delta=1.5 K.