Research reveals divergent speciation of NiII complexes in solid state and solution, highlighting structural differences and implications for applications.
Herein we study the structures of selected 2,9-disubstituted and 2-monosubstituted phenanthroline NiII-dibromido and diiodido complexes via SC-XRD, SQUID magnetometry, UV-vis-NIR and DOSY NMR. In spite of the divergent speciation in solid state and in DMF solution, the NiII-dibromido complexes of both mono- and disubstituted phenanthrolines converge to monomeric species in both THF and CDCl3. On the other hand, the nickel iodide complexes remain as monomers both in solid state and in solution, regardless of ligand substitution patterns.
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Mateos-Calbet et al. (2025) studied this question.
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