Figure 9.
Optimized structures of 1:2 complexes showing hydrogen bonds in [H6L(F)2]4+ (A), in [H6L(Cl)2]4+ (B), in [H6L(Br)2]4+ (C), and [H6L(I)2]4+ (D) in the gas phase at M06-2X/6-311G(d,p) level.
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