Synthesis and structural characterization of new ladder-like organostannoxanes derived from carboxylic acid derivatives: [C5H4N(p-CO2)](2)[Bu2Sn](4)(mu(3)-O)(2)(mu(2)-OH)(2), [Ph2CHCO2](4)[Bu2Sn](4)(mu(3)-O)(2), and [(p-NH2)-C6H4-CO2](2)[Bu2Sn](4)(mu(3)-O)(2)(mu(2)-OH)(2)

Three types of ladder-like organostannoxanes, [C5H4N(p-CO2)](2)[Bu2Sn](4)(mu(3)-O)(2)(mu(2)-OH)(2) (1), [Ph2CHCO2](4)[Bu2Sn](4)(mu(3)-O)(2) (2), and [(p-NH2)-C6H4-CO2](2)[Bu2Sn](4)(mu(3)-O)(2)(mu(2)-OH)(2) (3), have been synthesized and characterized using elemental analyses, Fourier-transform infrared spectroscopy, nuclear magnetic resonance (H-1, C-13) experiments, and, for 1 and 2, single-crystal X-ray diffraction analysis. X-Ray diffraction discloses that complexes adopt tetranuclear tin(iv) ladder-like structures containing two (1) or four (2) deprotonated ligands. The essential difference between their molecular structures is that in 2 there are four carboxylate ligands, while in 1 and 3 there are two. The crystal structure of 1 reveals them to be a tetranuclear structure containing a three-rung-staircase Sn4O4 core. The Sn4O4 cluster consists of a ladder of four Sn2O2 units. For 2, the structure is a tetranuclear centrosymmetric dimer of an oxoditin unit having a central four-member ring. In this complex, the central Sn2O2 core is fused with two four-member and two six-member rings. In the structures, there are two types of tin ions arranged in distorted trigonal bipyramid geometry or octahedron geometry. A series of O-HMIDLINE HORIZONTAL ELLIPSISN, C-HMIDLINE HORIZONTAL ELLIPSISO, and C-HMIDLINE HORIZONTAL ELLIPSIS pi intermolecular hydrogen bonds in these complexes play an important function in the supramolecular, or two-dimensional network structures are formed by these interactions.