Other Cations of Group 6-12 Elements

The Re oxafluoro acetonitrile complex prepared by Schrobilgen and coworkers1020 [Eq. (4.251)] and characterized by spectroscopic methods ( H, 13C, 19F NMR and Raman) has a pseudooctahedral cis-dioxo arrangement. The acetonitrile ligands are tram to the oxygens and the fluorines are trans to each other. 

Re02F3.SbF5 + 2MeCN, neo t nT [Re02F2(MeCN)2]+SbFs (4.251) 

The homoleptic carbonyl salt [Hg(CO)2]+(Sb2Fn )2 reacts with traces of water in the HF—SbF5 superacid to yield the bis-aqua solvate [Hg2(OH2)2]2+(SbF6-)2-4 HF.1024 The cation is almost linear with nearly C2/, symmetry. The Hg—Hg and Hg—O bond distances are 2.4917 A and 2.148 A, respectively, and the O—Hg—Hg bond angle is 177.6°. 

The first metal-xenon compound with direct Au—Xe bonds has been reported by Seidel and Seppelt1027-1029 [Eq. (4.252)]. The salt crystallizes in two crystallographic modifications differing in cation-anion interactions. In each form the cation is a regular square. In the triclinic modification the Au—Xe bond lengths are between 2.7330 A and 2.7779 A and there are three weak interionic contacts (Au—F 

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