Guanidinium-boric acid-carbonate

Figure 8,71 Projection diagram showing a portion of the guanidinium-boric acid-carbonate 1 2 1 rosette network viewed along the a axis at x = 1/2 in the crystal structure of 37. The atom types are differentiated by size and color, and N-H- O and O-H O hydrogen bonds are represented by broken lines. The layer is composed of independent guanidinium ion C(1) (labeled by the central carbon atom), boric acid B(1), and carbonate ion C(2). Symmetry transformations a (x, — y, z), b (1 — x, 1 — y, 1 — z), c (1 — x, j y, 2 — z) and d (1 X, —y, 2 + z). Mean atomic deviation from rosette plane [A], 0.12 A [B], 0.29 A (see colour plate section)...

CO 2B(0H)3. c Molecular packing in [( -C3H3)3N+] 2B(0H)3 with charge-compensating nonpolar (n - Pr)4N+ cations between puckered layers, with guanidinium-boric acid-carbonate networks having a 1 2 1 composition (yellow spheres) (reproduced with permission from [49])... 

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