“…These reagents have been shown to react with metals and chalcogens or pnictogens to produce quaternary compounds, most of which are nothing more than salts but most of which have been described as ''supramolecular compounds''. The chemistry of such compounds is rich and includes [Hg 3 Q 2 ][SiF 6 ] (Q ¼ S, Se, Te) [6], [Hg 3 Q 2 ][MX 6 ] (Q ¼ S, Se; M ¼ Zr, Hf; X ¼ Cl, Br) [7], [Hg 3 Se 2 ] [Se 2 O 5 ] [8], [Hg 6 T 4 ][MX 6 ]X (T ¼ P, As; M ¼ Mo, Ti; X ¼ Cl, Br) [9,10], [Hg 7 As 4 ][AgI 3 ] 2 [11], [Hg 3 T 2 ][TlX 3 ] (T ¼ As, Sb; X ¼ Cl, Br) [12], [Hg 6 As 4 ][YbBr 6 ]Br [13], [Hg 11 As 4 ][GaBr 4 ] 4 [14], and [Hg 2 As] 2 [CdI 4 ] [15]. Here we report the syntheses, crystal structures, optical properties, and magnetic properties of the first Hg/U chalcogenides or pnictides, namely [Hg 3 Te 2 ][UCl 6 ] and [Hg 4 As 2 ][UCl 6 ].…”