Infinite square-tubular helices, [CuCl₂(L)(S)] (L = bis(4-pyridyl)methylvinylsilane; S = Me₂SO, HCONMe₂), were constructed. This helical system affords three kinds of P, M crystals in Me₂SO, and racemic crystals in HCONMe₂. The cyclic voltammogram (CV) technique using the M-crystals is an effective tool for discerning the chirality of proline.

Investigations into the anion effects on the molecular construction of a series of CuX₂ (X⁻ = BF₄ ⁻, ClO₄ ⁻, and NO₃ ⁻) complexes with 1,3,5-tris(isonicotinoyloxyethyl)cyanurate (L) were carried out. Suitable combinations of tridentate N-donor ligands and a variety of coordination geometries of copper(II) ions produce unique 1D, 2D, and 3D coordination polymers containing open cavities suitable for small chemical species, according to the nature of the polyatomic anions. Indeed, the anion exchangeability and catalytic effects of these polymers are strongly dependent on subtle anion differences, including solubility. Calcination of [Cu(ClO₄)(L)(Me₂SO)₂](ClO₄)·2CH₂Cl₂ crystals preserves its crystallinity at 200 °C, and at 600 °C finally produces stick-shaped microcrystalline copper(II) oxide.