Bis-tetradentate complexes of Cd(ii) and Hg(ii) with N8 coordination: Structural and NMR comparisons

Edith V. Bowers, Geoffrey S. Murphy, Stephanie N. Till, Christopher J. VandenBussche, Melissa M. Yaroschak, Robert D. Pike, Raymond J. Butcher, Deborah C. Bebout

Research output: Contribution to journalComment/debatepeer-review

Abstract

Tripodal N4 ligands tris[(1-methylimidazol-2-yl)methyl]amine (L1), bis[(1-methylimidazol-2-yl)methyl][(2-pyridyl)methyl]amine (L2) and [(1-methylimidazol-2-yl)methyl]-bis-[(2-pyridyl)methyl]amine (L3) were used to prepare five new [ML2](ClO4)2 (M = Cd(ii), Hg(ii)) complexes. All complexes had N8 metal coordination and a trans-bicapped octahedral structure as determined by X-ray crystallography. Metal–nitrogen bond distances generally decreased in the order M–Namine > M–Npyridyl > M–Nimidazoyl, and the perchlorates were well separated from the metal ions. Variable temperature solution state1 H NMR spectroscopy revealed conditions for slow intramolecular reorganization were more readily accessible for the Cd(ii) complexes than for the Hg(ii) complexes. Both protons of imidazoyl ring ligand components had large, comparable J(199 Hg1 H) despite sizable differences in nuclear separation.

Original languageEnglish (US)
Pages (from-to)16475-16485
Number of pages11
JournalJournal of the Chemical Society. Dalton Transactions
Volume43
Issue number43
DOIs
StatePublished - Oct 14 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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