With the aim of obtaining new fluorescent biomarkers, we have synthesized nanodiamond–dye dyads which form a stable aqueous suspension. In the dyads, by means of nucleophilic substitution of the nitro group, the N-substituted 4-nitro-1,8-naphthalimide was added to the ultradisperse nanodiamonds via a long alkyl chain. We studied the absorption and fluorescence spectra and also the fluorescence decay kinetics for the dyads. We propose that the non-exponential fluorescence decay for the dyads in aqueous suspension is due to two ways to position the plane of the N-substituted 1,8-naphthalimide relative to the plane of the nanodiamond.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 82, No. 2, pp. 272–277, March–April, 2015.
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Pavlovich, V.S., Lugousky, A.P. & Stupak, A.P. Photophysical Properties of Nanodiamonds Covalently Bonded to N-Substituted 1,8-Naphthalimide. J Appl Spectrosc 82, 266–271 (2015). https://doi.org/10.1007/s10812-015-0096-x
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DOI: https://doi.org/10.1007/s10812-015-0096-x