Preservation of Chirality
and Polarity between Chiral
and Polar Building Units in the Solid State
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Abstract
The new lamellar phases [Zn(2,2′-bpy)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>](ZrF<sub>6</sub>)·3H<sub>2</sub>O (<b>I</b>) and [Ni(2,2′-bpy)<sub>3</sub>](MoO<sub>2</sub>F<sub>4</sub>)·5H<sub>2</sub>O (<b>II</b>) (bpy
= bipyridine),
which are built from a chiral cation and respectively an inherently
nonpolar and a polar anion, provide two contrasting structures with
respect to chirality and polarity in the solid state. Each nonpolar
layer of <b>I</b> contains enantiomers of both handednesses;
conversely, each layer of <b>II</b> contains only a Δ
or Λ enantiomer and polar anions oriented along the <i>b</i> or −<i>b</i> axes. A comparison with
previously reported structures reveals which combinations and interactions
between chiral and polar basic building units can preserve elements
of polarity and chirality in the solid state
