The crystal structure and polarised Raman spectrum of Rb2AgI3

Abstract

The crystal structure of Rb2AgI3, space group Pnma, a = 10.258(2), b = 4.886(4), c = 20.063(10) Å, has been refined. It is isostructural with K2AgI3 with chains of corner linked AgI4 tetrahedra (Ag—I(bridge) = 2.881 Å, Ag—I(terminal) = 2.834 Å) running along b. The average bonding distance around the two seven coordinate Rb atoms is 3.722 Å. The polarised Raman spectrum shows the expected 36 modes which are assigned to four different symmetry species. All modes occur with frequencies less than 112 cm−1.