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1542737366
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Δc refers to change in concentration (M) and Δδ to change in chemical shift in ppm. If the chemical shift changes to higher ppm value we have assigned Δδ as positive, whereas if the shift is to lower ppm value we have assigned Δδ as negative.
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We are currently doing M.O. and molecular dynamics calculations to explore potential models to explain our observations and their implications. We are also doing NMR experiments to study the effect of orientation of the molecule at different concentrations on the chemical shift changes, as noted by the authors in Ref. 5(b).
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85106537852
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85106538363
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1H NMR spectra of various compounds were also measured at 90 MHz on a JEOL spectrometer at UNCW, NC, and at 500 MHz on a Bruker Avance-DRX spectrometer at the Department of Chemistry, Columbia University, NY.
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43
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1542632122
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note
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Partial support for this research was provided by the PEW consortium, NSF in the form of an instrument grant to one of the authors (A.M.) (USE-9052233) and in the form of a research grant to the other (P.S.) (CHE-9408755).
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