Two Novel Chiral Inorganic–Organic Hybrid Materials Containing Preyssler and Wells–Dawson Heteropolyoxometallates with Valine (val), Glycine (gly), and Proline (pro) Amino acids: (Hval)2(Hgly)(H3O)6K5[Na(H2O)P5W30O110]·19.5H2O and (Hpro)6[P2W18O62]·8H2O

Abstract

Two novel chiral organic-inorganic hybrid materials based on two important heteropolyoxometallate namely Preyssler and Wells-Dawson anions, (Hval) 2 (Hgly)(H 3 O) 6 K 5 [Na(H 2 O)P 5 W 30 O 110 ]Á19.5H 2 O (1) and (Hpro) 6 [P 2 W 18 O 62 ]Á8H 2 O (2), were prepared and characterized by elemental analysis, X-ray diffraction, and infrared spectroscopy. The mixed amino acid as cations, Preyssler and Wells-Dawson as anions held together into a 3D-network through hydrogen-bonding interactions. The most unique structural features of 1 and 2 are their 3D-inorganic infinite tunnel-like framework. It results a weak van der Waals interlayer interaction. This provides a desirable condition to use its potential as a host in a host-guest complex. The chirallity for these two crystal structures, with the space group P2 1 has been observed. The electrostatic forces and hydrogen bonding, keep these ''adducts'' stable in the solid state.