title: High-throughput microwave-assisted discovery of new metal phosphonates.
abstract: A systematic study was carried out to investigate the influence of linker geometry, metal ionic radius as well as the nature of the counter ions on the structure formation of metal tetraphosphonates. Two tetraphosphonic acids p- and m-(H2O3PCH2)2N-CH2-C6H4-CH2-N(CH2PO3H2)2, six metal ions (Ca(2+), Mn(2+), Co(2+), Ni(2+), Zn(2+), and Cd(2+)) and two different counter ions (Cl(-) and NO3(-)) were employed using high throughput methods. Microwave (MW)-assisted heating led to the discovery of ten new metal-phosphonates which crystallize in three different crystal structures. The combination of direct methods and force field calculations allowed us to establish the crystal structures. The counter ion and the ionic radii of the metal ions have a profound influence on the crystallinity and the formed crystal structure. All compounds were characterized in detail by thermogravimetric analyses, IR spectroscopy and magnetic susceptibility measurements. The proton conductivity of two selected compounds is also reported.
authors: Institut für Anorganische Chemie, Christian-Albrechts-Universität, Max-Eyth Straße 2, D 24118 Kiel, Germany.
authors: Mark
authors: M
authors: Feyand
authors: Christopher F
authors: CF
authors: Seidler
authors: Carsten
authors: C
authors: Deiter
authors: Andre
authors: A
authors: Rothkirch
authors: Alexandra
authors: A
authors: Lieb
authors: Michael
authors: M
authors: Wark
authors: Norbert
authors: N
authors: Stock