



Acta Cryst. (1997). B53, 252-261 [doi:10.1107/S0108768196012918]
Synopsis: In the crystal structure of tetra-n-butylammonium hydrogen oxalate-thiourea (1/2) the quaternary ammonium ions are sandwiched between puckered layers, which are constructed from thiourea-hydrogen oxalate ribbons. Three thiourea-quaternary ammonium fumarate (or hydrogen fumarate) complexes exhibit thiourea-anion lattices which are distinctly different from one another, depending on the stoichiometries and the presence of co-crystallized water molecules.
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