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Title: A new purification method for Ni and Cu stable isotopes in seawater provides evidence for widespread Ni isotope fractionation by phytoplankton in the North Pacific
Award ID(s):
1736896
PAR ID:
10282247
Author(s) / Creator(s):
; ; ; ; ; ;
Date Published:
Journal Name:
Chemical Geology
Volume:
547
Issue:
C
ISSN:
0009-2541
Page Range / eLocation ID:
119662
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  2. Abstract

    Metal–metal bonds play a vital role in stabilizing key intermediates in bond‐formation reactions. We report that binuclear benzo[h]quinoline‐ligated NiIIcomplexes, upon oxidation, undergo reductive elimination to form carbon–halogen bonds. A mixed‐valent Ni(2.5+)–Ni(2.5+) intermediate is isolated. Further oxidation to NiIII, however, is required to trigger reductive elimination. The binuclear NiIII–NiIIIintermediate lacks a Ni−Ni bond. Each NiIIIundergoes separate, but fast reductive elimination, giving rise to NiIspecies. The reactivity of these binuclear Ni complexes highlights the fundamental difference between Ni and Pd in mediating bond‐formation processes.

     
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