Anion-Induced Formation of Lanthanide-Organic Chains From 3D Framework Solids. Anion Exchange in a Crystal-to-Crystal Manner

A water-mediated transformation reversibly converts the neutral 3D microporous coordination polymers [Ln(2)(adipate)(3)(-)(H(2)O)(4)]center dot 6H(2)O (Ln(3+) = Pr(3+)) and [Ln(2)(adipate)(3)(H(2)O)(4)]xH(2)O (Ln(3+) = Gd(3+), Sm(3+)), into the ionic 1D polymer [Ln(adipate)(H(2)O)(5)]XH(2)O (with X = NO(3)(-), Cl(-) and Ln(3+) = Pr(3+), Gd(3+), Sm(3+)). The 1D polymer consists of positively charged hydrogen-bonded lanthanide-adipate chains enclathrating NO(3)(-) or Cl(-) anions acting as templates. The hydrogen bonds linking the chains between them are so strong, that it is possible to exchange NO(3)(-) for Cl(-) and vice versa in a crystal-to-crystal manner. The anion exchange reactions were directly observed oil crystals by Using Raman microprobe spectroscopy, single-crystal X-ray diffraction, and scanning electron microscopy. Crystal Growth & Design