Tetraphenylphosphonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)aurate(III) acetone solvate and ethyltriphenylphosphonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)aurate(III).

In the two title complexes, (C24H20P)[Au(C3S5)2] x C3H6O, (I), and (C20H20P)[Au(C3S5)2], (II), the Au(III) atoms exhibit square-planar coordinations involving four S atoms from two 2-thioxo-1,3-dithiole-4,5-dithiolate (dmit) ligands. The Au-S bond lengths, ranging from 2.3057 (8) to 2.

6-Bromo-1-butylindoline-2,3-dione.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(12)H(12)BrNO(2). The C-C bond lengths of the two carbonyl C atoms of the five-membered rings are distinctly longer than a normal Csp(2)-Csp(2) single bond. One of the mol-ecules makes parallel self-coupled (inversion) dimers by π-π inter-actions with phen-yl-phenyl inter-planar distances of 3.

l-Lysinium trifluoro-acetate.

Ions of the title compound, C(6)H(15)N(2)O(2) (+)·C(2)F(3)O(2) (-), a new organic nonlinear optical crystal, are linked by N-H⋯O hydrogen-bonding inter-actions. Both the amino groups of the l-lysinium cation are protonated. A three-dimensional network of hydrogen bonds is observed, forming a closed ring.