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Figure 4
(a) and (b) Synthetic scheme for the formation of monomer 1 and monomer 2 in water–acetic acid medium; (c) and (d) comparative UV–vis spectra of the respective monomers with their reactants; (e) 1H spectrum of monomer 2.

IUCrJ
Volume 3| Part 6| November 2016| Pages 402-407
ISSN: 2052-2525
https://doi.org/10.1107/S2052252516013762