Gold(I) and Mercury(II) Xenon Complexes

Characterization of an organometallic xenon complex using NMR and IR spectroscopy

“…A general trend correlating increasing Xe chemical shifts with increasing oxidation number is well known (32), and other compounds in which the Xe is formally in an oxidation state of zero are obviously rare. Noteworthy is the fact that a 129 Xe chemical shift has been reported for the coordinated Xe atoms in the cationic complex [Au(AsF 3 )Xe] ϩ dissolved in HF͞SbF 5 (9). In this case, the 129 Xe chemical shift was found at ␦ Ϫ5,150, which is within 1 ppm of the free Xe present in excess in this sample.…”

“…The great majority of this noble gas chemistry has resulted from interaction of Kr and Xe with electron-deficient, highly oxidizing reagents to create compounds containing the noble gas in positive oxidation states (6). More recently, the occurrence of atomic Xe as a discrete ligand in a selection of cationic gold and mercury inorganic complexes has been demonstrated, with the bonding occurring through a lone pair of electrons on the Xe (7)(8)(9)(10). Theoretical studies had previously predicted high stability of such cationic gold complexes (11).…”

Are matrix isolated species really “isolated”? Infrared spectroscopic and theoretical studies of noble gas-transition metal oxide complexes

“…Besides the above-mentioned noble gastransition metal carbonyl complexes, a number of noble gas-organometallic complexes such as ( 5 -C 5 H 5 )Mn(CO) 2 -(Xe), ( 5 -C 5 H 5 )M(CO) 3 (Xe) (M = Nb, Ta), Rh(CO)(PMe 3 ) 2 -(Ng) (Ng = Kr, Xe), ( 5 -C 5 H 5 )Rh(CO)(Ng) (Ng = Xe and Kr), Cp*Rh(CO)(Ng) (Cp* =  5 -C 5 Me 5 ; Ng = Xe and Kr), and Re( 5 -C 5 H 5 )(CO) 2 (Xe) have also been characterized in solution at room temperature [19][20][21][22][23][24][25][26][27]. Strong noble gas-transition metal bonding has been observed in some noble metal systems [28][29][30][31][32][33][34][35][36][37][38]. The [AuXe 4 ] 2+ [Sb 2 F  11 ] 2 salt provides the first crystallographic evidence of a transition metal-noble gas bond with a binding energy of approximately 200 kJ/mol with respect to Au 2+ and Xe [28].…”

On the position of helium and neon in the Periodic Table of Elements

“…Consequently, there is a vast literature on theoretical predictions of novel light noble gas-containing cations (Borocci et al 2010;Rzepa 2010;Pan et al 2016; these efforts were reviewed: Lewars 2008) and experimental reports, as well (Cunje et al 2001;Roithová and Schröder 2009;Lockyear et al 2010), to mention just a few examples. However, the neutral (solid state) analogues of helides (stabilized by counteranions) do not exist albeit their first xenon analogues were successfully prepared (Seppelt and Seidel 2000;Hwang et al 2003).…”