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Dibutytlin oxide condenses with diisopropylammonium hydrogen 2,6-pyridinedicarboxylate to form bis(diisopropylammonium) tris(2,6-pyridinedicarboxylato)bis(dibutylstannate) trihydrate, whose crystal structure consists of a three-dimensional hydrogen-bonded framework of ammonium cations, stannate anions and water molecules. In the dianion, the carboxyl –CO 2  groups of the central 2,6-pyridinedicarboxylato member are each chelating an  O , N , O -dibutyl(2,6-pyridinedicarboxylato)tin molecule flanking it; one molecule has its C 2 Sn skeleton in an almost linear alignment [C–Sn–C 173.8(6)°; Sn–O 2.423(8) Å, 2.457(9) Å] whereas the other has a bent C 2 Sn skeleton [C–Sn–C 158.0(7)°] arising from anisobidentate chelation [Sn–0 2.303(7) Å, 2.785(8) Å]. Their tin atoms are seven-coordinate in  trans -C 2 SnNO 4  pentagonal bipyramidal geometries. Dibutyltin oxide reacts with diisopropylammonium hydrogen 4-hydroxy-2,6-pyridinedicarboxylate to yield centrosymmetric bis(diisopropylammonium) bis[aquadibutylstanny(2,6-pyridinedicarboxylato-4-olate)]. The water-coordinated tin atom [Sn–O water  2.409(3) Å] in the bis[aquadibutylstanny(2,6-pyridinedicarboxylato-4-olate)] dianion, whose negative charges reside on the 4-substituent oxygen atoms, is also seven coordinate [C–Sn–C C 159.6(2)°]. The dianions are linked to adjacent dianions through the diisopropylammonium counterions [N … O esteryl  2.954(4) Å, N … O hydroxyl  2.719(5) Å)] to result in a one-dimensional hydrogenbonded chain structure.

zeitschrift für kristallographie - crystalline materials

Dibutyltin derivatives of 2,6-pyridinedicarboxylic acids. Crystal structures of bis(diisopropylammonium) tris(2,6-pyridinedicarboxylato)bis(dibutylstannate) trihydrate and bis(diisopropylammonium) bis[aquadibutylstannyl(2,6-pyridinedicarboxylato-4-olate)]