Effects of the Inverse Trans-Influence in a Berkelium(III) Phosphine Oxide Complex An example of a 249Bk3+ phosphine oxide complex has been prepared to examine and quantify the effects of the inverse trans-influence (ITI) on a late actinide complex. This has been accomplished through a comparison of cis and trans Bk-ligand bonds in the meridional berkelium(III) complex, BkBr3(OPCy3)3 (OPCy3 = tricyclohexylphosphine oxide). A detailed bond metric analysis was completed that includes the shortest published distance for a Bk3+–O bond, attributed to the smaller coordination number of Bk3+ of six in mer-BkBr3(OPCy3)3. ITI calculations of the trans Bk3+–O bond provide an ITI value (98.5(2)%) comparable to that of mer-AmBr3(OPCy3)3 (98.2(2)%) and indicate a small 5f orbital contribution to bonding. This effect is discussed in the context of the isomorphous lanthanide(III) series where the ITI is calculated to be higher for mer-BkBr3(OPCy3)3 than in most Ln3+ analogues.

249Bk (t1/2 ~330 days) is a beta blasting bully, but sometimes things work out #fblockrocks #bkallday @teasactinides.bsky.social pubs.acs.org/doi/10.1021/...

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GO GO GO GO BROOOOOKLYN!! BED-STUY DO OR DIE YA HEAARRDDD 🗣️🗣️ #BKALLDAY #BrooklynSky

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In Harlem. What can I say about this place? Hmm..."Weaaaakkk weak weak weak Apollo weak weak Starbucks weak". Tis all. #BKallday