Abstract
The cation of the title compound, CI3HI4N~--C4H506-.H20, has a central guanidinium fragment with a planar geometry, as expected for sp 2 hybridization at the C atom. The conformation of the phenyl rings is syn-syn with respect to the unsubstituted N atom, but the overall conformation of the cation is far from the C2v symmetry predicted by ab initio calculations for the isolated ion. A broad range of hydrogen-bond interactions contributes to packing cohesion, the strongest of these linking the anions head-to-tail. Comment The synthesis of new materials with interesting nonlinear optical properties, by encapsulation of guanidinium cations between hydrogen L-tartrate anions, has been shown to be a potential route for the crystal engineering of materials with enhanced second-order non
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