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Figure 2 Hydrogen bonding interactions present in the solid state structures of 1 and 2. Thermal ellipsoids are rendered at 40% probability. Red ellipsoids represent oxygen atoms. Otherwise, the color scheme is identical to that found in Fig. 1. Tetraphenylborate anions, the acetone molecule that includes O4 (which does not participate in H-bonding), the bromine substituent present in 2, and hydrogen atoms that do not participate in H-bonding have been omitted. |