Structure–property relationships in hybrid (C 3 H 5 N 2 ) 3 [Sb 2 I 9 ] and (C 3 H 5 N 2 ) 3 [Bi 2 I 9 ] isomorphs

Two hybrid crystals imidazolium iodoantimonate( iii ) and iodobismuthate( iii ) have been synthesized and characterized in a wide temperature range (100–350 K) by means of X-ray diffraction, dielectric spectroscopy, proton magnetic resonance, FT-IR spectroscopy and optical observations.