Abstract
Interaction of pentaphenylantimony with acetylenedicarboxylic acid. Molecular structure of bis(tetraphenylantimony) acetylenedicarboxilate
Highlights
It is known that the interaction of pentaarylantimony with dicarboxylic acid can give two types of compounds: acidic tetraarylantimony carboxilates and bis(tetraarylantimony) carboxilates [1 4]
In the first case there is a tendency of the Ar4Sb fragment to the transformation into the tetrahedric configuration, which is accompanied by increase of the distance between the antimony atom and the oxygen atom of the monodentate carboxylic ligand, which has the bond of coordinating character [1 3]
The bridging carboxilyc ligand has anisobidental type of coordination caused by intramolecular interactions Sb···O=С between the antimony atoms and carbonyl oxygen atoms [2, 4 6]
Summary
It is known that the interaction of pentaarylantimony with dicarboxylic acid can give two types of compounds: acidic tetraarylantimony carboxilates and bis(tetraarylantimony) carboxilates [1 4]. According to the X-ray diffraction data, the coordination of antimony atoms in these types of molecules is significantly different. The bridging carboxilyc ligand has anisobidental type of coordination caused by intramolecular interactions Sb···O=С between the antimony atoms and carbonyl oxygen atoms [2, 4 6]. А) A mixture of 0.200 g (0.394 mmol) of pentaphenylantimony and 0.022 g (0.197 mmol) of acetylenedicarboxylic acid in 5 mL of toluene was kept in a sealed glass ampoule at room temperature for 24 h. B) A mixture of 0.200 g (0.394 mmol) of pentaphenylantimony and 0.044 g (0.394 mmol) of acetylenedicarboxylic acid in 5 mL of toluene was heated in a sealed glass ampoule in a boiling water bath for 15 min. The supernatant toluene solution was concentrated, the crystals were filtered off and dried.
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