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Updated: Feb 12, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
Salt forms of sulfadiazine with alkali metal and organic cations
Gemma Campbell1, Rebecca Fisher1, Alan R Kennedy1
1Westchem, Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland.
Abstract:
The structures of four salt forms of sulfadiazine (SDH) with alkali metal cations are presented. Three contain the deprotonated SD anion (C10H9N4O2S). These are the discrete complex diaqua{4-[(pyrimidin-2-ylazanidyl-κN1)sulfonyl-κO]aniline}lithium(I), [Li(SD)(H2O)2], (I), and the coordination polymers poly[{μ3-4-[(pyrimidin-2-ylazanidyl)sulfonyl]aniline}sodium(I)], [Na(SD)]n, (II), and poly[diaqua{μ3-4-[(pyrimidin-2-ylazanidyl)sulfonyl]aniline}potassium(I)], [K(SD)(H2O)2]n, (III). Na complex (II) is a three-dimensional coordination polymer, whilst K complex (III) has two crystallographically independent [K(SD)(H2O)2] units per asymmetric unit (Z' = 2) and gives a two-dimensional coordination polymer whose layers propagate parallel to the crystallographic ab plane. The different bonding modes of the SD anion in these three complexes is discussed. Structure (IV) contains protonated SDH2 cations {4-[(pyrimidin-2-yl)sulfamoyl]anilinium, C10H11N4O2S} and the Orange G dianion [OG, 7-oxo-8-(phenylhydrazinylidene)naphthalene-1,3-disulfonate, C16H10N2O7S2], namely, 4-[(pyrimidin-2-yl)sulfamoyl]anilinium tetraaqua[7-oxo-8-(phenylhydrazinylidene)naphthalene-1,3-disulfonato]sodium(I) sesquihydrate, (SDH2)[Na(OG)(H2O)4]·1.5H2O. The [Na(OG)(H2O)4]2 dimers have antiparallel naphthyl ring structures joined through two Na centres that bond to the hydrazone anions through the O atoms of the ketone and sulfonate substituents. The structures of the salts formed on reaction of SDH with 2-aminopyridine and ethanolamine are also presented as 2-aminopyridinium 4-[(pyrimidin-2-ylazanidyl)sulfonyl]aniline, [C5H7N2][SD], (V), and ethanolaminium 4-[(pyrimidin-2-ylazanidyl)sulfonyl]aniline monohydrate, [HOCH2CH2NH3][SD]·H2O, (VI), respectively. Structure (V) features a heterodimeric R22(8) hydrogen-bond motif between the cation and the anion, whilst structure (VI) has a tetrameric core of two cations linked by a central R22(10) hydrogen-bonded motif which supports two anions linked to this core by R33(8) motifs.
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