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In the cation of the title salt, C9H12N3S+·Br-, the thiazolidine ring adopts an envelope conformation with the C atom adjacent to the phenyl ring as the flap. In the crystal, N—H···Br hydrogen bonds link the components into a three dimensional network. Weak π–π stacking interactions between the phenyl rings of adjacent cations also contribute to the molecular packing. A Hirshfeld surface analysis was conducted to quantify the contributions of the different intermolecular interactions and contacts. [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]