Bis(μ2-4-amino-3-nitrobenzoato)bis(4-amino-3-nitrobenzoato)octabutyldi-μ3-oxido-tetratin(IV)

Abstract

The tetranuclear molecules of the title compound, [Sn4(C4H9)8(C7H5N2O4)4O2], reside on a crystallographic inversion center. Both the two independent Sn atoms are five-coordinate, with distorted trigonal–bipyramidal geometries. One Sn atom is coordinated by two O atoms of the carboxylate anions, one bridging O atom and two butyl groups and the other Sn atom is coordinated by an O atom of the carboxylate anion, two bridging O atoms and two butyl groups. All the butyl groups are equatorial with respect to the SnO3 trigonal plane. The molecular structure is stabilized by intramolecular N—H...O hydrogen bonds. In the crystal, pairs of intermolecular bifurcated acceptor N—H...O and C—H...O hydrogen bonds link the molecules into chains along [10overline{1}]. Weak intermolecular C—H...π and π–π interactions [centroid–centroid distance = 3.713 (2) Å] are also observed.