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Rare Crystal Structure of Open Spirolactam Ring along with the Closed-Ring Form of a Rhodamine Derivative: Sensing of Cu2+ Ions from Spinach

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posted on 2019-03-13, 00:00 authored by Sujoy Das, Kari Rissanen, Prithidipa Sahoo
Crystal structures of a rhodamine derivative in its closed and open spirolactam ring forms were developed, which allows selective and sensitive detection of Cu2+ ions at a micromolar range in neutral medium. The chemosensing properties of the probe through a pentacoordinate Cu2+ ions were proven by spectroscopic and theoretical analysis. The spirolactam ring opening as the Cu2+ selective sensor was applied to spinach (Spinacia oleracea) to estimate the accumulation of copper as copper­(II) in the plant.