Bismuth Carboxylates with Brucite- and Fluorite-Related Structures: Synthesis Structure and Properties

Three
new compounds of bismuth, [C4N2H10]­[Bi­(C7H4NO4)­(C7H3NO4)]·H2O, I, [Bi­(C5H3N2O4)
(C5H2N2O4)], II, and [Bi­(μ2-OH)­(C7H3NO4)], III, have been prepared by the reaction between
bismuth nitrate and heterocyclic aromatic dicarboxylic acids, 2,6-pyridinedicarboxylic
acid, 4,5-imidazoledicarboxylic acid, and 3,4-pyridinedicarboxylic
acid, respectively, under hydrothermal conditions. The structures
of all the compounds have linkages between Bi2O2 and the corresponding dicarboxylate forming a simple molecular unit
in I, a bilayer arrangement in II, and a
three-dimensional extended structure in III. The topological
arrangement of the nodal building units in the structures indicates
that a brucite-related layer (II) and fluorite-related
arrangement (III) can be realized in these structures.
By utilizing the secondary interactions, one can correlate the structure
of III to a Kagome-related one. The observation of such
classical inorganic related structures in the bismuth carboxylates
is noteworthy. Lewis acid catalytic studies on the formation of ketal
suggest the possible participatory role of the lone pair of electrons.
All the compounds are characterized employing elemental analysis,
IR, UV–vis, and thermal studies.