Structure and Bonding in CsNa2Hg18, a New Ternary Amalgam with Strong Coulombic Bonding Contributions

The new ternary amalgam CsNa2Hg18 was synthesised from the elements in an unconventional low-temperature procedure. It crystallises a tetragonal structure type (space group I4/mmm, = 7.3054(7) and c 20.046 Å) combines ionic metallic bonding contributions. In crystal structure, Cs Na atoms are embedded Hg scaffold with highly covalent Hg–Hg bonding. alkali metal coordinated exclusively by unusual environments coordination numbers CN 24 for 16 Na. Polar amalgams suitable model systems studying parameters influencing ’bad behaviour’ polar intermetallic phases. We present structural studies on basis of powder single diffraction data together measurements specific resistivity DFT calculations electronic structure. For CsNa2Hg18, high can be observed, but Ioffe–Regel saturation is expressed much less than other amalgams.