“…Note that throughout section we will use the notation LA for light atoms and also for heavier spectator NMR atoms (e.g., Se or Te) in the vicinity of an even heavier HA. Based on refs , , , , , , , , , , and − , the following general rules can be derived for periodic trends in the SO-HALA shifts: - A formally empty valence shell at the HA (p 0 , d 0 , or f 0 configuration) gives rise to SO-HALA deshielding of LA(s) bonded directly. This is the case particularly for HAs with 5d 0 and a positive oxidation state Cs I –Os VIII , for 6p 0 Hg II –Bi III (the 6s 2 shell is present but unimportant in this context), and for 6d 0 5f 0 Ac III –U VI . ,,,, For the corresponding lighter analogs, the effect exists in diminished form (Figure ).
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