The Scott test has been used for over 50 years as a presumptive test for cocaine. It involves a series of reagent additions and color changes...and if it's not done and interpreted correctly, it can send innocent people to jail. This crystal structure now published in Acta Cryst E gives insight into what's going on in the test.
Bis(N,N-diethyl-4-methyl-4-piperazine-1-carboxamide) tetrakis(isothiocyanato-κN)cobalt(II), a model compound for the blue color developed in the Scott test. Oliver, A. G., Lockwood, T.-L. E., Zinna, J. & Lieberman, M. (2023). Acta Cryst. E79, 163-166
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