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The central thiazolidine ring of the title salt, C16H16N3S+·Br-, adopts an envelope conformation, with the C atom bearing the phenyl ring as the flap atom. In the crystal, the cations and anions are linked by N-H···Br hydrogen bonds, forming chains parallel to the b-axis direction. Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contributions to the crystal packing are from H···H (46.4%), C···H/H···C (18.6%) and H···Br/Br···H (17.5%) interactions. [ABSTRACT FROM AUTHOR]

The title salt, C16H15ClN3S+.Br-, is isotypic with (E)-3-[(4-fluorobenzylidene)-amino]-5-phenylthiazolidin-2-iminium bromide [Khalilov et al. (2019). Acta Cryst. E75, 662-666]. In the cation of the title salt, the atoms of the phenyl ring attached to the central thiazolidine ring and the atom joining the thiazolidine ring to the benzene ring are disordered over two sets of sites with occupancies of 0.570 (3) and 0.430 (3). The major and minor components of the disordered thiazolidine ring adopt slightly distorted envelope conformations, with the C atom bearing the phenyl ring as the flap atom. In the crystal, centrosymmetrically related cations and anions are linked into dimeric units via N--H···Br hydrogen bonds, which are further connected by weak C--H. . .Br contacts into chains parallel to the a axis. Furthermore, not existing in the earlier report of (E)-3-[(4-fluorobenzylidene)amino]-5-phenylthiazolidin-2-iminium bromide, C--H···π interactions and π-π stacking interactions [centroid-to-centroid distance = 3.897 (2) A°] between the major components of the disordered phenyl ring contribute to the stabilization of the molecular packing. Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contributions for the crystal packing are from H···H (30.5%), Br···H/H···Br (21.2%), C···H/H···C (19.2%), Cl···H/H···Cl (13.0%) and S···H/H···S (5.0%) interactions. [ABSTRACT FROM AUTHOR]