Abstract
In the structure of the complex salt formed from the reaction of manganese(II) acetate with (4-aminophenyl)arsonic acid (p-arsanilic acid), [Mn(H2O)6](C6H7AsNO3)2·4H2O, the centrosymmetric Mn(H2O)6coordination polyhedron has slightly distorted octahedral stereochemistry, with the two hydrogen (4-aminophenyl)arsonate anions and the four water molecules of solvation related by inversion. Extensive O—H...O, O—H...N and N—H...O hydrogen bonds link all species, giving an overall three-dimensional supramolecular structure, which also has weak π–π ring interactions [minimum ring-centroid separation = 3.7304 (15) Å]. The structure is isotypic with that of the Mg salt.
Highlights
In the structure of the complex salt formed from the reaction of manganese(II) acetate with (4-aminophenyl)arsonic acid (p-arsanilic acid), [Mn(H2O)6](C6H7AsNO3)2Á4H2O, the centrosymmetric Mn(H2O)6 coordination polyhedron has slightly distorted octahedral stereochemistry, with the two hydrogen (4-aminophenyl)arsonate anions and the four water molecules of solvation related by inversion
The arsenical (4-aminophenyl)arsonic acid (p-arsanilic acid) has biological significance as an anti-helminth in veterinary applications (Steverding, 2010) and its crystal structure (Shimada, 1961; Nuttall & Hunter, 1996) has shown that it exists as a zwitterion
We have reported the crystal structure of this salt and the NH4+ salt (Smith & Wermuth, 2014), together with the structures of the K, Rb and Cs salts (Smith & Wermuth, 2017a), as well as the alkaline-earth metal salts Mg, Ca, Sr and Ba (Smith & Wermuth, 2017b)
Summary
The arsenical (4-aminophenyl)arsonic acid (p-arsanilic acid) has biological significance as an anti-helminth in veterinary applications (Steverding, 2010) and its crystal structure (Shimada, 1961; Nuttall & Hunter, 1996) has shown that it exists as a zwitterion. Other single-metal complex structures are known, e.g. with Ag, Pb, Cd, Zn (Lesikar-Parrish et al, 2013), but no structures of single-metal first transition series compounds of hydrogen p-arsanilic acid have been reported. Our reaction of this acid with manganese(II) acetate in aqueous ethanol gave the title complex salt, [Mn(H2O)6](C6H7AsNO3)2Á4H2O, and the structure is reported . O3W—H32WÁ Á ÁO4W O4W—H41WÁ Á ÁO12iv O4W—H42WÁ Á ÁO11iii O5W—H51WÁ Á ÁO11v O5W—H52WÁ Á ÁO1W vi
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