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P. S. GUNASEKERA ET AL.
characterized Fe(II) complex with a bis-benzimidazole carboxylate ligand. While not
conclusive, we propose that incorporation of the tert-butyl group narrowed the solu-
tion speciation that enabled the crystallization. Nevertheless, incorporation of the tert-
butyl was not enough to temper the diverse coordination enabled by this ligand class.
Further coordination studies using Fe(III) may result in the desired mono-ligated prod-
uct and is ongoing.
Acknowledgment
This work was completed using the resources of the Chemistry Instrument Center (CIC) at UB;
we thank E. Jensen and K. Zemaitis for assistance.
Disclosure statement
No potential conflict of interest was reported by the authors.
Funding
Financial support was provided by the University at Buffalo (UB). The FTICR Mass spectrometer
used in this study was purchased with funding from NIH S10 RR029517.
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